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University of Agricultural Sciences, Dharwad

The University of Agricultural Sciences, Dharwad was established on October 1, 1986. The University has 5 Colleges, 27 Research Stations, 6 Agriculture Extension Education Centers, 6 Krishi Vigyan Kendras and ATIC. The University has its jurisdiction over 7 districts namely Bagalkot, Belgaum, Bijapur, Dharwad, Gadag, Haveri, and Uttar Kannada in northern Karnataka. Greater diversity exists in soil types, climate, topography cropping and farming situations. The jurisdiction includes dry-farming to heavy rainfall and irrigated area. Important crops of the region include sorghum, cotton, rice, pulses, chilli, sugarcane, groundnut, sunflower, wheat, safflower etc. The region is also known for many horticultural crops. Considerable progress has been registered in the field of education, research and extension from this University.

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Thesis Type: Ph.D × Subject: Soil Science and Agriculture Chemistry ×
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Now showing 1 - 9 of 62
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    ThesisItemOpen Access
    Studies on Soil Carbon Dynamics in Major Production Systems in Zone III and Zone VIII of Northern Karnataka
    (University of Agricultural Science, Dharwad, 2016-06) Jayaprakash, R.; Yeledhalli, N.A.
    A study was undertaken to know the dynamics of soil carbon fractions in irrigated and rainfed ecosystems of northern Karnataka involving Zone III and Zone VIII under UAS Dharwad in the year 2014-15 in both rabi and kharif season. Surface samples (0-20 cm) and a representative pedon was collected from different cropping system namely sugarcane, cotton and maize in irrigated condition, whereas groundnut, chilli and soybean from rainfed condition. Soils were analyzed for different carbon fractions at UAS Dharwad in the department of soil science and agricultural chemistry like water soluble carbon, microbial carbon, microbial nitrogen, particulate organic carbon, readily oxidizable carbon and total organic carbon. Among the different cropping system studied sugarcane cropping system accounted for higher soil carbon fractions in soil than the rest of the cropping systems. Irrigated ecosystem registered higher build up of soil carbon fractions compared to rainfed ecosystem. Our results clearly indicated that the application of organic amendments along with inorganic fertilizer improved the SOC (soil organic carbon) content. Integrated nutrient management practices followed in irrigated system, where higher amount of organic manure along with balanced application of fertilizers added in to the soil resulted in higher build up and turnover of Total organic carbon (TOC) in soil. The Study of the different pedons revealed that soil carbon fractions like water soluble carbon, microbial biomass carbon, microbial biomass nitrogen, particulate organic carbon, readily oxidizable carbon and total organic carbon decreased significantly with increase in depth. The effective soil management practices such as combined application of fertilizer and organic amendments led to increased activity of soil enzymes which indirectly increased the SOC turnover and buildup in irrigation ecosystem. TOC was positively and significantly correlated with aggregate stability, organic carbon, particulate organic carbon and water soluble carbon.
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    ThesisItemOpen Access
    Soil Resource Inventory of Chikmegeri-3 Micro-Watershed in Koppal District Using Remote Sensing and Gis Techniques
    (University of Agricultural Science, Dharwad, 2015-12) Manjunatha Chari K.; Hebbara, Manjunatha
    A study was undertaken to assess land capability, crop suitability and land degradation status in Chikmegeri-3 micro-watershed of Koppal district. The soil survey was conducted using 1:7920 scale LISS IV satellite imagery and cadastral map. The soils were shallow to deep, dark reddish brown (2.5 YR) to very dark gray (10 YR) and sandy clay to clay in texture. The soils were classified up to family level. The exchangeable bases were in the order of Ca2+> Mg2+>Na+> K+. The soils were low in nitrogen and organic carbon, low to medium in phosphorus and sulphur, medium to high in potassium, iron, copper and manganese were sufficient and zinc was deficient. As per the land capability classification, soils belonged to class III and IV lands with limitations of texture, drainage and soil properties. Land suitability evaluation revealed that soils were suitable for pearl millet, sorghum and mulberry; moderately for soybean, groundnut, guava, pomegranate, sapota, mango, rose and jasmine and marginally for maize, finger millet, pigeonpea, chickpea and chilli crops. Water erosion and water logging were identified as major land degradation types 85.77, 7.04, 0.24 and 6.95 per cent of TGA was affected by sheet, rill, gully erosion and water logging, respectively. The soil loss studies revealed that 47.36, 21.35 and 10.14 per cent of TGA was affected by slight, moderate and severe soil loss, respectively. The low crops yield compared to their expected average yield was due to constraints of unfavorable climate and physico-chemical properties. Based on VS-Fast score approach of land degradation assessment, depth, tillage pan, surface crust and organic matter were the major constraints. Among soil quality indicators, exchangeable potassium, bulk density, mean weight diameter and dispersion index were identified as critical parameters. Soil quality indices of the mapping units ranged from medium to high
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    ThesisItemOpen Access
    PHOSPHORUS AND POTASSIUM MANAGEMENT UNDER INTENSIVE RICE CROPPING IN TUNGABHADRA (TBP) IRRIGATION COMMAND
    (University of Agricultural Sciences, Dharwad, 2003) HEBBARA, MANJUNATHA; PATIL, S G
    Field experiments were conducted to evaluate the effect of N, P and K levels under intensive rice-rice cropping system on crop performance, P-K availability, P-K uptake, P-K use efficiencies and P-K balance studies at Agriculture Research Station, Gangavati, Karnataka during 2000-01. Application of NPK @ 200:100:75 kg/ha (N:P:K ratio of 2.7:1.3:1.0) to BPT-5204 during kharif and 250:100:75 kg/ha (N:P:K ratio of 3.3:1.3:1.0) for IR-64 during rabi/summer was optimum and economically most remunerative. Though, higher NPK levels and ratios resulted in higher rice yields, the N:K ratios remained wider than the desired (< 2.0:1.0). The farmers control (230:90:110 kg/ha of NPK) was equally remunerative as above and had more balanced N:P:K ratio (2.1:0.8:1.0) than in the above treatments. The RDF application resulted in sub-optimal rice nutrition resulting in significantly lower yield than the above. Phased application of NPK up to BGF stage to a mid-long duration variety BPT-5204 was beneficial. However, this advantage was not realized during raMsummer with a mid duration variety like IR-64. The economic analysis also revealed similar trend. A tissue P of 0.33 per cent for BPT-5204 and 0.30 per cent for IR-64 at AT stage was optimum. Similarly, a tissue K of 1.37 per cent for BPT-5204 and 1.55 per cent for IR-64 at PI stage was found ideal. Fertilizer N:P and N:K ratios were significantly related to tissue P (at AT) and K (at PI) but not P.K ratio. Leaching losses of P and K were significantly higher under higher level of NPK fertilization and under only N splits compared to NPK splits. Leaching losses of P and K were also significant under farmers control over RDF application. The partial net P balance was positive with P application (RDP and beyond) during both the seasons. The partial net K balance was negative under RDK application (75 kg/ha K) during kharif and both RDK and 125 kg/ha of K application during rabi/summer. A higher fertilizer N:K ratio, coupled with negative K balances, especially at higher N rates, suggested unsustainability of such application practices on long term basis.
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    ThesisItemOpen Access
    CO-APPLICATION OF SEWAGE SLUDGE AND FLY ASH ON CROP YIELD AND SOIL PROPERTIES WITH EMPHASIS ON HEAVY METAL CONTAMINATION
    (University of Agricultural Sciences, Dharwad, 2003) PRAKASH, S S; PATIL, C V
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    STUDIES ON YIELD AND QUALITY OF BYADGI CHILLI (Capsicum annuum L.) IN RELATION TO SOIL PROPERTIES IN TRANSITIONAL ZONE AND PART OF DRY ZONE OF NORTH KARNATAKA
    (University of Agricultural Sciences, Dharwad, 2000) BIDARI, B l; SARANGAMATH, P A
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    STUDIES ON PHOSPHORUS ENRICHED ORGANIC MANURES ON P-AVAILABILITY TO MAIZE - BENGAL GRAM CROPPING SEQUENCE IN VERTISOL
    (University of Agricultural Sciences, Dharwad, 2000) Basavaraj; Manjunathaiah, H M
    A field experiment was conducted at Main Research Station , University of Agricultural Sciences, Dharwad on chromic haplusterts during kharif and rahi of 1997 -98 and 1998 -99 , to investigate the effect of phosphoru sen riched organic manure son soil properties and crop yield of maize and their residual effect on bengal gram under irrigated condition .
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    ThesisItemOpen Access
    PHOSPHORUS DYNAMICS IN VERTISOLS UNDER SUNFLOWER - MAIZE - BENGALGRAM CROPPING SEQUENCE
    (University of Agricultural Sciences, Dharwad, 1999) BHAT, SHREEPAD; DODDAMANI, V S
    An investigation was carried out to know the effect of single superphosphate (SSP), Mussoori rock phosphate (MRP), 25 percent acidulated rock phosphate (PARP) and their combination and P solubilizers viz. FYM, pyrite and P solubilizing microorganisms (PSM) on P transformation, available P, crop yield under sunflower-maize-bengalgram cropping sequence in Verlisols of Water Management Research Centre, Belavatagi, during 1996-97 and 1997-98. Asi incubation study with 28 treatment combinations was also conducted to assess the extent of release of P with time. Results of incubation study revealed that recovery of P from SSP and SSP + PARP at 30,60 and 90 days was 11.1,11.3 and 11.2 and 9.2,8.3 and 9.1 percent, respectively Recovery of P from MRP at the corresponding period was 1.6,1.4 and 4.4 percent. Incorporation of FYM increased available P followed by pynte and PSM at 30 days of Incubation. Available P at harvest of 3 crops with SSP was higher. At harvest of second and third crop, MRP recorded 9.0 and 30 0 percent higher available P over P control. Available P due to solubilizers was in the order of FYM>Pyrite>PSM>control. Yield of sunflower did not differ due to P sources and solubilizers. The highest (27.07q/ha) and lowest (24.42 q/ha) yield of maize was registered with SSP and MRP, respectively. The yield of bengalgram was also the highest (16.74 o/ha) due to residual effect of SSP and was on pay with p sources except MRP and P control. Among the solubilizers higher grain yield of crops was observed with FYM followed by pynte and PSM. The Ca-P was higher in MRP and FARP; and with their combination with other P sources and was because of di and tri-calcium, phosphate present in MRP and less solubility of Ca-P in alkaline sods. SSP and its combination with other P sources increased Al-P and Fe-R which are well correlated with yield of crops. On the basis of crop yield available P it is inferred that the next best alternative treatment for increased crop yield and available P was SSP + PARP.
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    ThesisItemOpen Access
    UTILITY OF SLUDGE FROM PHOSPHORIC ACID INDUSTRY (BILT) AS A P-SOURCE IN LOWLAND PADDY (Oryza sativa L.] COWPEA (Vigna unguiculata) CROPPING SEQUENCE
    (University of Agricultural Sciences, Dharwad, 2002) CHANNAKESHAVA, S; SARANGAMATH, P A
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    Studies on Soil Organic Carbon Sequestration Under Selected Tree Plantations and Agroforestry Systems of Northern Transition and Hill Zones of Karnataka
    (University of Agricultural Science, Dharwad, 2015-10) Roodagi, Mallikarjun; Gali, S.K.
    A study was conducted during 2012-2013 at MARS, Dharwad and ARS, Prabhunagar to evaluate the soil organic carbon stocks (SOC) under selected tree plantations and agroforestry systems. The content of total carbon, soil organic carbon and its stocks in soils varied between the tree species and also two ecosystems viz., block plantations of trees and agro ecosystems and between Northern Transition (Zone-8) and Hill (Zone-9) of Karnataka. The amount of total carbon in soil, soil organic carbon and SOC stocks were highest in the soils under teak plantation at both the locations. The soil at ARS, Prabhunagar recorded higher values than the soil at MARS Dharwad. Among the block plantations of Dharwad, total carbon, SOC and SOC stocks were in the order of Teak > Mangium > Bamboo > Tamarind > Neem > Simarouba. But, at ARS, Prabhunagar, the three parameters were in the order of Teak > Sapota > Bamboo > Simarouba. Comparison between the two ecosystems at MARS, Dharwad highlighted, soils under block plantations had much higher SOC stocks than those of agroforestry systems. In the agroforestry systems, soil of neem AFS recorded highest SOC and SOC stocks followed by pongamia AFS and sapota AFS. Due to the improvement in soil organic carbon, physical properties like water holding capacity and water stable aggregates improved under different tree covers while, bulk density decreased. There was slight decrease in the pH of soil under tree covers, whereas no appreciable change in EC was observed. The organic matter fractions viz., humic acid and fulvic acid contents, available macronutrients, micronutrients, labile carbon, water soluble carbon, dehydrogenase and phosphatase activities were higher under tree plantations and agroforestry systems. The benefits of growing trees as a component of annual crops in the agroforestry ecosystems in sequestering atmosphere carbon was quite evident from the study.