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Search string: - DEPARTMENT OF SOIL SCIENCE AND AGRICULTURAL CHEMISTRY (723) answer(s).
 
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1
ID:   039827

A case study on soil available nurient status and petiole nutrient concentration in papaya orchards of North Karnataka / S. Manohar Gouda; S.N. Upperi 2001  Thesis
Manohar Gouda, S. Thesis
Edition M.Sc (Agri)
Publication University of Agricultural Sciences Dharwad: Dharwad, 2001.
Description 112p
Summary/Abstract ABSTRACT Survey was conducted during 2000-01 in the 28 papaya growing orchards of north Karnataka, with an objective to assess the available soil nutrient status and petiole nutrient concentration and to diagnose the most limiting nutrient though the concept of DRIS. In general, pH of the soil were neutral to alkaline, electrical conductivity was optimum and in safe range, the organic carbon content in all the orchards, varied with in the limit. The available nutrient status (mg kg-1) of the papaya orchard soils in north Karnataka are in the range of, N(35-217 mg kg-1, P(9-38 mg kg-1 (120-380 mg kg-1); Ca (405-1444 mg kg-1); mg (57-1046 mg kg-1), S (10-37.50 mg kg-1); Cu (1.75-7.11 mg ka-1); Mn (8.22-132.10 mg kg-1), Fe (3.45-34.90 mg kg-1); Zn(0.11-2.71 mg kg-1) and B(O.25-3.13 mgkg-1). The range of nutrient composition in sixth peticle from top are N (1.26-3.15%); P (0.15-0.56%): K (1.70-4.80%), Ca (1.87-3.15%); Mg (0.64-1.65%); S (0.30-0.59%); Cu (15.90-59.90 mg kg-1); mn (73.70-182.30 mg kg-1); Fe (30.90-316.90 mg kg-1); (15.40-28.40 mg kg-1) and B (9.12-40.79 mg kg-1). The petiole nutrient norms were developed for obtaining sustained fruit yields. The optimum nutrients I the petioles were: 1.35-3.27 per cent N, 0.25-0.49 per cent P,2.44-4.46 per cent K, 2.45-3.09 per cent Ca, 0.93-1.65 per cent Mg, 0.33-0.56 per cent S, it.77-26.43 mg kg-1 Zn, 17.37-43.37mg kg-1 Cu, 69.48-105.58mg kg-1 Fe, 82.81-140.71 mg ka-1 Mn and 18.08-38.96 mg kg-1 B. The DRIS indices indicated that in most of the low yielding papaya orchards, boron was the most limiting nutrient. However, often more than one nutrient was found to limit the yield. In addition to boron, P, K, Mg, Ca, N and Zn were also equally yield limiting, although the order varied in individual orchards.
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T07084630/MAN MainOn ShelfGeneral
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ID:   036412

A comparative evaluation of soil test metods for nitrogen / Revana G. Gowda; S. Shamanna; Department of Soil Science and Agricultural Chemis 1985  Thesis
Gowda, Revana G. Thesis
Edition M.Sc (Agri)
Publication University of Agricultural Sciences, Bangalore: Bangalore, 1985.
Description 64p
Summary/Abstract ABSTRACT THE study was undertaken to evaluate four of the soils test methods for available nitrogen on the basis of their correlation with the per cent yield response of the crop. In this investigation, four soil test methods (1) organic carbon (2) available nitrogen by KMNO4 method (3) mineralizable nitrogen by anaerobic incubation and (4) mineralizable nitrogen by aerobic incubation and five of the organic nitrogen fractions (Ammonium-N, Ammonium + Hexosamine-N, Serine + threonine-N, Amino acid-N and Ammonium + Hexosamine + Amino acid-N) that contribute to available nitrogen have been studied including their correlation relationship with the yield response. A pot culture experiment with 27 different soils varying their organic mater content was conducted. There were four levels of nitrogen in the experiment and the most important crop of Southern Karnataka was used as the test crop. The soils included in the study were mostly of light texture. The mechanical analysis of soils indicated a high proportion of sand fraction in the range of 48 to 82 per cent. The soils tested were natural in their reaction (pH 6.1 to 7.6). They contained negligible amounts of salts (E.C. 0.4 to 1.1 m mohs/cm). The organic carbon content varied from 0.24 to 1.15 per cent. The available nitrogen (KMNO4-N) content of soils was confined to medium range (from 169.34 to 329.28 kg/ha). Organic carbon method (Walkely and Black) gave the highest correlation of (--) 0.89 with per cent yield response out of the remaining three methods, only KMNO4 method was significant at 5 per cent. The other two methods failed to be significant. The other two methods failed to be significant. The nitrogen fractions in general gave very low correlation coefficients. Among these fractions Hexoseamine gave the highest correlation of (--) 0.36 with per cent yield response which was found to be non-significant. From the results of the experiment organic carbon method was found to be better index of soils-N availability to ragi crop, which can be used as a basis for fertilizer recommendation to the crop.
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T03892630/GOW MainOn ShelfGeneral
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ID:   037342

A comparative study of different sources of phosphoru son finger millet [Eleusine coracana (L.) Gaertn] And their residual effec / N.V. Prakash; V.R. Ramakrishna Parama; Department of Soil Science and Agricultural Chemis 1993  Thesis
Prakash, N.V. Thesis
Edition M.Sc (Agri)
Publication University of Agricultural Sciences, Bangalore: Bangalore, 1993.
Description 133p
Summary/Abstract ABSTRACT A study was conducted at A.R.S. Nagenahally, Mysore in order to evaluate phosphatic sources on finger millet (var. Indaf -9) and their residual effect on succeeding soybean (Var. KHSb-2). Phosphosphates such as single superphosphate, Diammonium phosphate and Ammonium polyphosphate (SSP, DAP and APP) were tried at three different levels viz., Recommended dose (100: 50: 50: N: P: K kg ha-1), half and one and half times the recommended doses. Phosphate application generally increased the finger millet grain and straw yield. The residual phosphorus in treated plots increased soybean yield, this yield increase was marked in plots which had received higher doses of P. The performance of phosphates in increasing yields followed the order APP> DAP> SSP> CONTROL. The percent increase in grain yield of finger millet due to APP compared to control was 103.3%, in comparison to SSP was 32.3% and compared to DAP, APP gave 25.6% more yield. Phosphates positively influenced nutrient status of soil and the quality of both finger millet (grain, straw) and soybean. However, higher content of P in solid due to phosphates resulted in a reduced micronutrient status. From incubation study, initially the content of available P was more in SSP treated soils than DAP and APP treatments. However, P availability increased due to other sources DAP and APP over a period of time even after finger millet harvest. Transformation studies showed that the inorganic fractions viz., AL, Fe, R.S and Ca-P increased up to 95 days thereafter RS, Sal and Ca-p decreased whereas AL and Fe-P increased slightly or remained constant. Thus it could be emphasized that APP applications was advantageous as it not only increased crop yields, more importantly its residual P could suffice P needs of the succeeding crop thereby helping to economise P application.
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T04622630/PRA MainOn ShelfGeneral
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ID:   033547

A Compatative study of physical, chemical and mineralogical properties of salt affected and adjacent normal vertisols / A S Parashivamurthy; Department of Soil Science and Agricultural Chemis; Mohan VIshnu Deshpande 1985  Thesis
Deshpande, Mohan VIshnu Thesis
Edition M Sc (Agri)
Publication University of Agricultural Sciences, Bangalore: Bangalore, 1985.
Description 200p
Summary/Abstract None
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T00806631.41/DES MainOn ShelfGeneral
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ID:   034432

Adsorption, persistence and movement of fungicides in soils / A S Balasubramanian; P B Deshpande; Department of Soil Science and Agricultural Chemistry 1978  Thesis
Balasubramanian, A S Thesis
Edition M Sc (Agri)
Publication University of Agricultural Sciences, Bangalore: Bangalore, 1978.
Description 126p
Summary/Abstract ABSTRACT An investigation was taken up with the object of studying in nature the extent of adsorption, persistence, and movement of some important fungicides in different soils and their clay fractions viz., red, black, laterite. The fungicides studied were Pentachloro nitro benzene, captan, benonyl and wet ceresin. Adsorption of PCNB was highest in laterite soil followed by black and red soils. In case of red and black soil clays adsorption maxima was seen in Ca++ saturation and in laterite soil H+ /A+++ saturation showed the maximum. The half-life was ranged from 15 to 18 days depending upon the soils. However, most of the toxicant was retained in the upper layer. With respect to captan black soil showed maximum adsorption followed by laterite and red soils. In red soil caly maximum adsorption was seen in H+/A+++ saturation and in black soil clay Na+ saturation was fund to be superior. These were no significant difference in laterite soil clay. Captan degraded rapidly in different soils. The half-life accorded were 9 hrs to 25 hrs depending upon the soils. Here also the movement was restricted to 5 cm zone only. In case of benomyl adsorption it was found to be maximum in black soil but was on par with latents soils, followed by red soil. In red soil clay H+/- A1+++ saturation showed maximum adsorption. In black soil clay Ca++ saturation and in latent soil clay Na+ saturation were found to be superior. Benomy also degraded rapidly by half life periods were 2 to 3 hrs depending upon the soils. Here also the chemical was retained in the upper 5 cm layer. Black soil was found to adsorb wet ceresin significantly more than redand literate soils. In red and black soil clays. Ca++ saturation and in laterite soil clay H+/A1+++ saturation was found to be superior. It persisted to 22 days. The half-life period were 1.2 to 1.8 weeks depending upon the soils. It was uniformly distributed in all the 20 cm layer of the soil. For all the chemicals the movement followed an inverse relationship with adsorption of the fungicides in different soils.
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T01656630/BAL MainOn ShelfGeneral
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ID:   035458

Agricultural Utility of Flyash / B Hussain Saheb; C V Patil; Department of Soil Science and Agricultural Chemis 1993  Thesis
Saheb, B Hussain Thesis
Edition M Sc (Agri)
Publication University of Agricultural Sciences, Dharwad: Dharwad, 1993.
Description 149p
Summary/Abstract ABSTRACT A study on the agricultural utility of flyash was carried out under field and laboratory conditions. Field study was conducted on irrigated red soils (Alfi sols) 01 Sagamakunta village, Raichur taluk during summer 1992. The experiment was laid out in split plot design with three main treatments as control- gypsum @ 500 kg ha-1 and FYM @ 20 t ha-1. Flyash levels, 0, 10, 20 and 30 t ha-1 were the sub treatments. Groundnut (cv. KRG-1) was grown as test crop. Laboratory incubation study was designed to understand the effect 01 amendments (gypsum and FYM) and Flyash levels on the late 01 applied and native nutrients in soil. Application of amendments and flyash significantly increased the growth and yield of groundnut. The highest pod yield (36.6 q ha-1) was recorded due to application 01 flyash at 30 t ha-1. The increase in pod yield over control was 74.3 per cent. The uptake 01 NPK and micronutrient by groundnut increased significantly due to application of amendments, particularly FYM along with flyash @ 30 t ha-l. Addition of different levels of flyash to soil altered the mechanical composition of soil towards increasing silt content. There was decrease in bulk density and increase in water holding capacity. Amendments failed to reduce the crust strength of soil, but flyash levels reduced the crust strength of soil significantly and helped to maintain it throughout the crop growth period. Significant reduction in soil pH and increase in the electrical conductivity of soil was seen with the application of amendments and different levels 01 flyash either individually or in combination, significantly improved the available N, P, K and micronutrient status of soil both under laboratory and field conditions.
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T03174630/HUS MainOn ShelfGeneral
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ID:   036291

Agricultural utility of fly ash under dryland condition / Ashok M. Jambagi; C.V. Patil; Department of Soil Science and Agricultural Chemis 1995  Thesis
Jambagi, Ashok M. Thesis
Edition M.Sc (Agri)
Publication University of Agricultural Sciences, Dharwad: Dharwad, 1995.
Description 143p
Summary/Abstract ABSTRACT A field experiment was carried out at Agricultural College Farm Raichur during rabi 1993-94 to evaluate the effect of application of fly ash on growth and yield of safflower under rain fed situations. The experiment was laid out in split - split plot design with three replications. The main treatments consisted of black and red soil types. Subplot treatments were no FYM control and FYM at 20 t/ ha. Fly ash Levels, viz. 20,40,60,80 and 100 t/has were taken on sub-sub plot. Application of FYM 20 t/ha increased growth and yield of safflower significantly in both the soils. Seed yield was significantly higher in black soils than in red soil. The growth and yield of safflower increased significantly with increasing levels of fly ash and the highest seed yield in both the black soil (1527 Kg/ha) and the red soil (11.26 Kg/ha) was recorded at 60t/ha level. The availability of water and nutrients in both the soils increased significantly due to applications of FYM and fly ash levels, consequently the uptake of NPK, S and micronutrients was significantly higher due to combined application of FYM @ 20t/ha and fly ash at 60t/ha. Different levels of fly ash application significantly altered the mechanical composition of soil towards increasing silt content reduced bulk density, and soil pH.
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T03439630/JAM MainOn ShelfGeneral
8
ID:   052094

Analysis of land qualities in a watershed using gis / P. Nideesh; K.M. Nair; Department of Soil Science and Agricultural Chem. 2003  Thesis
Nideesh, P. Thesis
Edition M.Sc (Agri)
Publication University of Agricultural Sciences: Bangalore, 2003.
Description 113p
Summary/Abstract Cbh
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T09081630/NID MainOn ShelfGeneral
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ID:   052070

An appraisal of soils irrigated with sugar factory effluent under the cauvery command / B.N. Umesh; M. Krishnappa; Department of Soil Science and Agricultural Chemis 2002  Thesis
Umesh, B.N. Thesis
Edition M.Sc (Agri)
Publication University of Agricultural Sciences: Bangalore, 2002.
Description 89p
Summary/Abstract Kadam
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T09074630/UME MainOn ShelfGeneral
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ID:   047175

Anion unsaturation of soil and utilization of phosphatic fertilizer by crops / D.L. Deb; N.P. Datta; Department of Soil Science and Agricultural Chemis 1964  Thesis
Deb, D.L. Thesis
Edition Ph.D
Publication Indian Agricultural Research Institute: New Delhi, 1964.
Description 220p
Summary/Abstract Kadam
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T00331630/DEB MainOn ShelfGeneral
11
ID:   040052

Assessment of management induced changes in soil properties in relation to productivity of an alfisol A case of study of rajanuk / S. Mathurajau; A.M. Krishnappa; Department of Soil Science and Agricultural Chemis 2001  Thesis
Mathurajau, S. Thesis
Edition Ph.D (Soil)
Publication University of Agricultural Sciences Bangalore: Bangalore, 2001.
Description 152p
Summary/Abstract ABSTRACT IMPROPER or ill managed land resources are prone to severe erosion (e) and bereft of soil moisture and nutrients due to shallow soil depth (s). This warrants for identifying suitable land use systems with improved conservation measures to arrest erosion and enhance the productivity of crop. Hence, the present study was taken up with an objective to assess the management induced changes in soil quality and productivity under selected land use systems of arable and non-arable lands at Chokkanahalli and Addevishwanathapura micro-watersheds located at Rajanukunte in Bangalore north taluk of Bangalore urban district during 1998. The sandy clay loam textured surface soil in both arable and non-arable lands observed during 1986 was found unchanged over a period of twelve years under improved systems comprising agriculture, agro-forestry, agri-horti, silvi-pasture, horti-pasture and pasture. Similarly, no marked changes could be seen in the textural class of sub soils under the above systems. A slight reduction in the bulk density was observed under pasture system of non-arable land followed by improved agricultural of arable after twelve years compared to benchmark period. Maximum water holding capacity, available soil moisture, mean weight diameter of soil aggregates and infiltration rate of soil were improved in the soils of pasture system of non-arable land as compared to bench mark period. Insignificant changes could be seen in other parameters like pH and electrical conductivity under given land use system. An improvement in the organic carbon content of soil in both arable and non- arable lands under improved systems was observed both in surface and subsurface soil compared to bench mark period. A similar trend was observed in major plant nutrients like available nitrogen phosphorus, potassium, sluphur and exchangeable calcium and magnesium as well as DTPA extractable micronutrients. The highest enzymes activity was found under pasture system. The highest crop yield in ragi was recorded under improved agriculture system followed by agro-forestry and agri-horti compared to traditional agriculture system. The green fodder yield of scabra, hamata and cassia in non-arable land was gradually reduced over a period of time due to increased spread of tree canopy under silvi-pasture followed by horti-pasture as compared to pasture system alone. Economic returns were highest from improved agri-horti system, followed by agriculture and agro-forestry compared to traditional agriculture under arable land while it was highest in horti-pasture system under non-arable land. The land with initially classified as lle, IIIes (arable land) and Ves VIes (non-arable land) was changed to II, III and Vs, VIs due to adoption of improved soil moisture conservation measures over a period of twelve years indicating minimizing the erosion vis-à-vis improvement in soil depth.
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T07408630/MUT MainOn ShelfGeneral
12
ID:   052432

Assessment of salt tolerance in some medicinal and aromatic crops / H.P. Rajesha; Manjunatha Hebbara; Department of Soil Science and Agricultural Chem. 2006  Thesis
Rajesha, H.P. Thesis
Edition M.Sc (Agri)
Publication University of Agricultural Sciences: Dharwad, 2006.
Description 102p
Summary/Abstract Cbh
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T09383630/RAJ MainOn ShelfGeneral
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ID:   032945

A study of cation exchange properties of some important soil series of upper krishna project area / Gopal Kulkarni; T Seshagiri Rao; Department of Soil Science and Agricultural Chemis 1980  Thesis
Kulkarni, Gopal Thesis
Edition M Sc (Agri)
Publication University of Agricultural Sciences, Bangalore: Bangalore, 1980.
Description 95p
Summary/Abstract ABSTRACT AN investigation was undertaken to study the cation exchange properties of the soils of Upper Krishna Project Area in Karnataka. The soil series selected for the study are Tumkur, Kagalgomb and Managuli which are fine textured black soils and Sagar, Shivpur and Geddalmari which are coarse textured red soils. The soils were equilibrated with four series of equilibrating solutions namely Na-Ca, Na-Mg, Ca- Mg and Ca-K. Exchangeable cations were determined in each case. It was observed that all the soils preferred calcium to magnesium, magnesium to potassium and potassium to sodium throughout their depth. Generally surface soils adsorbed more sodium than the sub-surface soils. Heavy textured soils adsorbed calcium more strongly than the light textured soils and showed the tendency to become less sodic than the light textured soils under similar conditions. This was attributed to the clay mineralogical differences among the soils. Heavy textured soils were found to contain specific adsorption sites for calcium to a considerable extent whereas they were less in light textured soils. Relationship between SAR and ESP was linear and positive and highly significant correlation coefficient was observed. EPP values highly correlated with PAR values but the relationship was not linear. U.S.S.L. Staff (1954) equation under estimated the ESP of the soils and Bower's (1959) equation over- estimated the ESP of the soils. Gapon ion exchange equation was found fit for prediction of ESP of the soils under Ca- Mg- Na systems but it did not fit well in a system containing potassium.
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T00437631.41/KUL MainOn ShelfGeneral
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ID:   033213

A study of forms of phosphorus, phosphate potential, Q/I Relationship and sorptionin relation to phosphoru availability in selec / V S Doddamani; T Seshagiri Rao; Department of Soil Science and Agricultural Chemis 1982  Thesis
Doddamani, V S Thesis
Edition M Sc (Agri)
Publication University of Agricultural Sciences, Bangalore: Bangalore, 1982.
Description 200p
Summary/Abstract ABSTRACT TWENTYSIX surface soils (0-15 cm) from different agro-climatic regions representing typical black, red, laterite and alluvial soil types of Karnataka were selected to study the forms of phosphorus, phosphate adsorption and desorption, Q/I relationship and the supply parameter. Calcium bound phosphorus was dominant form of phosphorus in black and alluvial soils constituting 19.5 and 11.5 per cent of the total P, respectively. whereas the AI-P, Fe-P and reductant soluble P were the major soil P fractions in laterite and red soils. The organic- P contributed 69.2, 56.7, 56.4 and 53.5 per cent to the total P in alluvial, red, black and laterite soils, respectively. On the basis of solubility product, it was found that the solubility of phosphate in laterite soils was controlled by strengite and variscite while that in black, alluvial and some of the red soils it was governed by octacalcium phosphate and hydroxyapatite, phosphate potential of different soils varied from 6.8 to 7.6. The Q/I relationship studied revealed that black soils exhibited high potential buffering capacity (PBC) for P (949.5ml/g), followed by alluvial (548.5ml/g), laterite (436.6ml/g) and red (169.4ml/g) soils. The data on P adsorption was found to conform to Langmuir adsorption isotherm at an equilibrium solution P concentrations ranging from 1.2 to 5.4 ppm. Phosphorus adsorption maxima ranged from 159.17 to 641.9 ug/g, the lowest being in red soil and the highest in laterite soils. In a pot culture study 95 per cent of the maximum dry matter yield of maize was noticed when the level of P in soil was adjusted to an equilibrium solution P concentration of 0.2 - 0.3 ppm. The phosphorus supply parameter in all the soils increased with the increase in concentration of P in equilibrating solution. Quantity of phosphorus desorbed in 10 sequential extractions with 0.01 M.CaCI2 was less in case of laterite and alluvial soils and was more in black soils followed by red soils.
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T00552631.41/DOD MainOn ShelfGeneral
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ID:   032559

A study of Na - Ca, Na-Mg and Na - Ca - Mg Ion- Exchange equilbria in some of the soils of malaprabha left bank canal area in ka / T Seshagiri. Rao; Department of Soil Science and Agricultural Chemis; Mohan Vishnu Deshpande 1977  Thesis
Deshpande, Mohan VIshnu Thesis
Edition M.Sc (Agri)
Publication University of Agricultural Sciences, Bangalore: Bangalore, 1977.
Description 71p
Summary/Abstract ABSTRACT Ion-exchange studies were conducted on six soil bodies in Malaprabha left bank canal area (Karnataka) representing Gokak, Bankaneri, Chimankatti, Pattadkal and Godachi Soil series. The procedure consisted of equilibrating the soils with mixed solution of Na-Ca, Na-mg and Na-Ca-Mg in different ratio and determining the exchangeable cations. In all the soil bodies and all depths calcium and magnesium were preferred to sodium. In Gokak, Pattadkal and Godachi Soil bodies the ESP values in Na-Mg system were more than in Na-Ca system. But in Pattadkal. Bankaneri and Chimankatti soil bodies the reverse was true. There was a highly significant positive correlation between the SAR of the equilibrating solution and the ESP of soil in all cases. The regression equation proposed by the U.S. Salinity Laboratory Staff and C. A. Bower for predicting the ESP values of the soil after irrigation were found unsuitable for the soils studied. Exchange constants were calculated for all the six soils in Na-Ca, Na-Mg and Na-Ca-Mg system using Gopon equation, equivalent fraction equation and vanselow equation. In Gokak soil there was least coefficient of variation equilibrium constant of equivalent fraction equation. In the case of the other five soil bodies the same was true with Gopon equation corrected for activities. It may be concluded that difference in the nature of parent materials and mineralogy of soils have to be taken into account in evaluating the effect of irrigation water on soils.
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T00237630.24/DES MainOn ShelfGeneral
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ID:   032927

A study of physico-chemical characterstics of some salt affected soils in tungabhadra river valley project left bank canal area / T Seshagiri Rao; Department of Soil Science and Agricultural Chemis; K Srinath 1979  Thesis
Srinath, K Thesis
Edition M Sc (Agri)
Publication University of Agricultural Sciences, Dharwad: Dharwad, 1979.
Description 115p
Summary/Abstract ABSTRACT Some of the physical and chemical properties of salt affected soils in the left bank canal area of Tungabhadra River Valley Project were studied. The pH values in all the soils were more than 7.5 indicating that they are alkaline in reaction. The electrical conductivity of surface layers was higher indicating the movement of soluble salts from sub-surface layers. The concentration of sulphates was more than the concentration of chlorides indicating the sulphate type of salinity. The soluble sodium was the predominant cation. The higher concentration of hot water soluble boron in the surface layers indicates the accumulation of boron in surface layer during the process of salinization. The exchangeable sodium percentage of the soils studied was more than 15 indicating the hazard of sodicity The suitability of D.S.S.L. Staff (1954) regression equation in predicting the exchangeable sodium percentage from sodium adsorption ratio was tested. By correcting the SAR only for activity, there was slight improvement in the relationship. But when the SAR was corrected both for activity and ion-pairing, there was good agreement between the actual and predicted ESP. A regression equation was developed using actual ESR and SAR (corrected for activity and ion pairing). ESR = -0.0997+0.01871 SAR The new regression equation predicts the ESP with greater accuracy even at SAR values, greater than 50. The relationship between ionic strength and electrical conductivity was tested using the equation, I = 0.022+0.014 B.C. When the ionic strength was corrected for ion pairing, there was improvement in the relationship. From the study the presence of shallow water table and seepage of water from the uplands may be accounted for the development of salt affected soils.
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T00337631.41/SRI MainOn ShelfGeneral
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ID:   032947

A study of some chemical properties of soils ok kabini right bank canal area with reference to irrigation / S M Subramanya; T Seshagiri Rao; Department of Soil Science and Agricultural Chemis 1980  Thesis
Subramanya, S M Thesis
Edition M Sc (Agri)
Publication University of Agricultural Sciences, Bangalore: Bangalore, 1980.
Description 100p
Summary/Abstract ABSTRACT THE concentration of soluble salts and the ionic composition of irrigation water are known to influence the soil characters. Hence, the prediction of the effect of irrigation water on soils is considered important in irrigated agriculture. So, investigations were carried out with the object of predicting the ion exchange that takes place on the exchangeable complex of different soil series viz., Madanahalli, Satyagala, Mugurmole, Hosur (red soils); Kothegal and Kiragasuru (black soils); on the application of Kabini river water and waters containing different cation ratios. Five solutions with SAR or PAR of 11.3, 7.3, 4.5, 2.6 and 1.4 were used for equilibration of soils for each of Na-Ca, Ma-mg, C-Ca and K-Mg exchange equilibria. The results revealed that in all the soil bodies and for all depths calcium and magnesium were preferred to sodium and potassium. The potassium was adsorbed from 3.61 to 5.73 times more that adsorption of sodium. The red soils attained higher ESP values than black soils at equilibrium with Kabini river water and also with water containing different cation ratios. The black soils attained higher EPP values compared to red soils at identical PAR values. The results of sodium-divalent and potassium divalent exchange show that the Madanahalli, Satyagala, Mugurmole and Hosur soils preferred calcium; whereas, the Kothegal and Kiragasuru soils preferred magnesium. Positive and highly significant correlation coefficient was observed between ESP and SAR, and between EPP and PAR, indicating the linear relationship. Among the various cation exchange equations studied, the Gapon equation corrected for activities was found to be satisfactory in describing sodium-divalent exchange equilibria in the soils of Madanahalli, Satyagala, Mugurmole, Hosur and Kiragasuru. In Kothegal soils Gapon equation was found to be satisfactory. Vanselow's equation was found to be least suitable in all cases. The constants derived to describe potassium divalent exchange equilibria reveals that Gapon equation corrected for activities gave the least coefficient of variation in all the six soils compared to equivalent fraction exchange and Vanselow equation.
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T00435631.41/SUB MainOn ShelfGeneral
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ID:   037373

A study of the physioco-chemical properties of selected soil profiles of upland, midland and lowlands of regional research stati / K.S. Siddaraju; B Badrinaht; Department of Soil Science and Agricultural Chemis 1990  Thesis
Siddaraju, K.S. Thesis
Edition M.Sc (Agri)
Publication University of Agricultual Sciences, Bangalore: Bangalore, 1990.
Description 107p
Summary/Abstract ABSTRACT An attempt was made to assess the morphological, physical and physico-chemcial properties of the soil profiles of upland, midland and lowlands of the regional research Station, Mudigere, Chickkamagalur district. Clay illuviation was a common feature of the land types while the content of fine sand and coarse sand was found to decrease with depth. An increase in clay content was noticed in mid-lands followed by uplands and lowlands. The soil textural class in upland and midland varied from sandy clay loam to clay. Whereas in lowland it was sandy loam to sandy clay loam. Soils of the uplands and midlands were more darker than the soils of the lowlands. Lowland soils had a higher bulk density, their maximum water holding capacity, total pore space and volume expansion were all low as compared to the soils of other two situations. The soil samples were all acidic ranging from 5.1 to 5.6 (pH) in uplands, 4.9 to 5.6 pH in midlands, whereas in low land soils the pH ranged from 5.3 to 6.5 and it increased depth wise in all the profiles. The uplands and midlands showed more cation exchange capacity and less base saturation. The amount of exchangeable cations were lesser in these toposequence. The organic matter content and nitrogen status were higher in midlands followed by uplands and lowlands, and their content decreased depthwise. The content of available phosporus was more in lowlands, but did not show a definite trend of distribution with depth. The content of available potassium was in the range of low to medium. The content of secondary nutrients in the soils of the three toposequence were comparatively lower. The content of micronutrients viz., zinc. Copper, managanese and iron varied with the elevation of the profiles. Except zinc, other micronutrients were adequate in all the different situations. There was no variation in the content of boron with respect to elevation and it was found to be deficient in all the soil profiles studied.
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ID:   038896

A study of the status of micronutrients and their distribution in soil sof Uttara Kannada District, Karnataka State / H.M. Kenchanagoudar; N. Vasuki; Department of Soil Science and Agricultural Chemis 1984  Thesis
Kenchanagoudar, H.M. Thesis
Edition M.Sc (Agri)
Publication University of Agricultural Sciences Bangalore: Bangalore, 1984.
Description 107p
Summary/Abstract ABSTRACT An investigation on the content, distribution and the relationship of soil properties which influences the availability of total and available micronutrients viz., zinc, copper, iron, manganese and boron were carried out in the typical soil bodies of different agroclimatic regions of Uttara Kannada district of Karnataka State. The total zinc content of the soils studied varied from 24 to 62 ppm. The more accumulation of total zinc at certain depth has been attributed to the accumulation of free iron oxides in all the soil bodies. The concentration of DTPA extractable zinc varied from 0.13 to 0.95 ppm in the soils studied. The distribution of DTPA extractable zinc was found to decrease with increase in depth. The total copper content in the soils studied varied from 124 to 400 ppm. The total copper was mainly influenced by organic carbon content and soil pH. The concentration of DTPA extractable copper varied from 0.40 to 2.80 ppm. The positive significant correlation (r=0.668**) with organic carbon may be attributed to the formation of stable complexes with natural complexing agents in soil solution. Total iron content varied from 0.32 to 2.2 per cent, which may be attributed to the igneous rocks being the parent material of the soils. The concentration of DTPA extractable iron in the soils studied varied from 2.25 to 67 ppm. An increase in the organic carbon and clay content, observed an increase in the DTPA extractable iron in surface and subsurface layers of the soil bodies respectively. The total manganese content in the soils studied varied from 50 to 3400 ppm. The accumulation of total manganese was noticed in the subsurface layers where the clay content was msre. The concentration of DTPA extractable manganese of the soils studied varied from 1 to 26.5 ppm. The accumulation of manganese at certain depth was related to free iron oxide content of the soils. The total boron content in the soils studied varied from 17.50 to 136.25 ppm. The upward accumulation of boron in coastal soils may be due to the inundation of sea water during some parts of the year. The concentration of hot water soluble boron varied from 0.26 to 1.24 ppm. An increase in depth with decrease in available boron contents was noticed in forest and coastal soils and the same was related to organic carbon content of the soil. The soils of Uttara Kannada district are quite adequate in respect of copper, manganese and iron, marginal to deficiency in respect of zinc, and marginal t adequate in respect of boron.
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ID:   033028

A study on the gensis and classfication of some soils of upper krishna project area / Venkatesh Kotabagi; A S Hadimani; Department of Soil Science and Agricultural Chemis 1981  Thesis
Kotabagi, Venkatesh Thesis
Edition M Sc (Agri)
Publication University of Agricultural Sciences, Bangalore: Bangalore, 1981.
Description 99p
Summary/Abstract ABSTRACT A study on the genesis and classification of some soils of Upper Krishna Project area was undertaken. Six soils representing Shivapur, Sugur, Geddalmari, Tumkur, Kagalgomb and Manguli series were chosen for the study. Shivapur, Sugur and Geddalmari series are red soils, developed on granitic gneiss and the rest three are black soils. Tumkur, Kagalgomb and Manguli series are developed from granitic gneiss, limestone and basalt respectively. Shivapur, Sugur and Geddalmari series are coarse textured, well drained soils. These are low in organic, organic carbon, devoid of alkaline earth carbonates and low in CEC values. Their pH values are near neutrality and they have less of soluble salts. Tumkur, Kagalgomb and Manguli series are poorly drained clayey soils. They exhibit the typical vertisol characters. Their pH is slightly alkaline and they have not got high EC values. The petrographic analysis of five sand fraction revealed that the soils inherit the characters of the parent rocks, Shivapur, Sugur and Geddalmari series have similar mineralogical composition and they exhibit similar soil characteristics in accordance with the nature of their parent rock. Kagalgomb and Manguli series are derived from fine textured alkaline parent materials and they exhibit vertisol characters. The profile representing Tumkur series is a vertisol but developed on granitic gneiss. The development of this profile is found to be under the influence of fluvial material, which was confirmed by the field observations. The soils were classified according to the New Comprehensive system of soil classification as: Shivapur series: Isohyperthermic Gravelly Calcic Typic Haplustalf; Sugur and Geddalmari series: Isohyperthermic Gravelly Typic Haplustalf; Tumkur series : Isohyperthermic Fluvial Montmorillonitic Paleustollic chromustert; Kagalgomb series: Isohyperthermic Montomorillonitic paleustollic chromustert: Manguli series: Isohyperthermic Montmorillonitic Typic chromustert. Shivapur, Sugur and Gaddalmari series are found to be best suited for groundnut, tur, hybrid bajra and hybrid jower cultivation. In the black soils, rabi jower, cotton and safflower can be grown. For these black soils better soil and water management practices should be undertaken.
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