Loading...
Thesis
Browse
4 results
Search Results
ThesisItem Open Access CHARACTERISATION OF COAL FLY ASH AND ITS INFLUENCE ON SOIL AND CROP QUALITY(University of Agricultural Science, Dharwad, 2000) Vageesh, T S; Siddaramappa, SABSTRACT NOT AVAILABLEThesisItem Open Access Studies on land degradation in the three agro-climatic zones of Belgaum District, Karnataka(UASD) Prabhavathi Koraprolu; G. S. DasogA study was carried out to determine the extent of different land degradation types in Belgaum district on 1: 50,000 scale using remote sensing and GIS techniques. Out of 13,44,084.60 ha of total geographical area of Belgaum district, 3,96,059.5 ha land is degraded accounting for 29.47 per cent. Among the various land degradation types, sheet erosion (23.13 %) was the dominant land degradation type followed by rill erosion (5.76 %) and barren rocky/ stony waste (0.44%). Three micro-watersheds were selected one each from Northern dry zone (Yadawad), Northern transitional zone (Hukkeri) and Hilly zone (Khanapur) for characterization, soil fertility mapping and soil loss risk assessment using USLE. The soils of Yadawad microwatershed were alkaline, low in organic carbon, available nitrogen, P2O5 and sulphur content and deficient in Zn and Fe. The soils of Hukkeri micro-watershed were neutral to slightly alkaline, low in organic carbon, available nitrogen and available phosphorus in two third of area. The entire watershed was found deficient in available sulphur, zinc and iron. The soils of Khanapur micro-watershed were slightly acidic to acidic in reaction. Available phosphorus, potassium and sulphur status was low in majority of the area. Nearly all of Yadawad micro-watershed depicted very low soil erosion risk class. Hukkeri microwatershed had very low soil erosion risk in 34.9 per cent of TGA and low soil erosion risk in 17.6 per cent of TGA. The Khanapur micro-watershed exhibited a wide range of soil erosion risk with 41.22 per cent of TGA under low soil erosion risk class with substantial extent (16.12 %) under high soil erosion risk class because of topographic variationThesisItem Open Access Studies on Organophophorus Pesticide Residues in Paddy Ecosystem and Evaluation of Zn and Fe Content in Paddy Grains and Soils of Gangavati Taluka in North Karnataka(UAS Dharwad, 2012) Selvaraj S.; N.S. HebsurThe present studies were carried out to evaluate the organophosphorus pesticide residues in soil, water and plant samples of paddy eco-system. The soil, water and paddy grain samples were collected from five farmers' fields from each village in a cluster of twelve villages and analyzed for organophosphorus residues viz., chlorpyriphos, quinalphos, monocrotophos and dichlorvos. The soils were also analysed for different fractions of zinc and iron and their contents in paddy grains. The soils were neutral to strongly alkaline in reaction, non-saline, low to high in organic carbon status with enough calcium carbonate. The analytical results indicated that chlorpyriphos was the only chemical detected in grains. In soils, chlorpyriphos was below detection limit and chemicals such as quinalphos, monocrotophos and dichlorvos were not detected. In water samples also, the concentration of these chemicals were below detection limit. The fractionation studies indicated that the order of zinc fractions in soils were: Water soluble + exchangeable Zn < Amorphous bound Zn < Manganese oxide bound Zn < Organically bound Zn < Sesquioxide bound Zn < Residual Zn < Total Zn. And dominant iron fractions were: Water soluble Fe < Exchangeable Fe < Residual Fe < Crystalline bound Fe < Amorphous iron oxide bound Fe < Total Fe. Zinc content in paddy grains varied from 12.17 ppm in Basapatna sample to 37.43 ppm in Karatagi sample with mean value of 21.39 ppm. Iron content ranged from 86.41 ppm in Sangapura sample to 213.31 ppm in Karatagi sample with mean value of 115.49 ppm. In conclusion, chlorpyriphos chemical residue was only in organophosphorus pesticide quantified in grain samples (0.01 ppm MRL) in paddy ecosystem of Gangavati taluka.ThesisItem Open Access Potassium Dynamics and Response to Applied Potassium in Paddy-Paddy and Sunflower Bengalgram Cropping System Under Vertisols in TBP Command Area(UAS Dharwad, 2011) K. Narayana Rao; N.A. Yeledahallisoil samples of dominant cropping system of TBP command area for physico-chemical and mineralogical properties of the soils, quality and distribution of different forms of potassium, potassium reserves in textural fractions and its fixation. Field experiments were also conducted to study the response of applied potassium in paddy-paddy and sunflower-bengalgram sequence with farmer’s participation. The soils are low in water soluble K, medium to high in exchangeable K, which ranged from 78 to 238 mg kg-1 in surface and from 103 to 265 mg kg-1 in subsurface layers. The non exchangeable K varied between 342 to 602 mg kg-1 and 374 to 631 mg kg-1 in surface and subsurface layers, respectively. The amount of lattice K content in surface horizons varied from 2.90 g kg-1 to 9.88 g kg-1 and 3.25 to 11.0 g kg-1 in subsurface layers of both the cropping sequence. The total content ranged between 3.38 to 10.56 and 3.89 to 11.0 g kg-1 in surface and subsurface horizons, respectively. The different forms of K were positively correlated with each other in soils of paddy-paddy sequence indicating its dynamic equilibrium compared to soils of sunflowerbengalgram sequence where no dynamic equilibrium exists between different forms of K. The soils of paddy-paddy sequence had higher K fixation compared to soils of sunflower-bengalgram sequence. The mineralogy of soils revealed the dominance of smectite in the clay fraction in both cropping sequence. The paddy, sunflower and bengalgram crops have responded to potassium application in both kharif and rabi seasons in a cropping sequence involving paddy-paddy and sunflower-bengalgram. The potassium balance sheet was negative in soils of both the cropping sequences.