Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810038042
Authors: JAHNAVI R. KATTI
Advisor: Dr. K. K. MATH
Title: STUDIES ON THE TRANSFORMATIONS OF CARBON, NITROGEN, PHOSPHORUS AND SULPHUR UNDER DIFFERENT NUTRIENT MANAGEMENT PRACTICES AND CROPPING SYSTEMS IN VERTISOL OF NORTHERN TRANSITION ZONE OF KARNATAKA
Publisher: University of Agricultural Sciences, Dharwad
Language: en
Type: Thesis
Agrotags: null
Keywords: STUDIES ON THE TRANSFORMATIONS OF CARBON, NITROGEN, PHOSPHORUS AND SULPHUR UNDER DIFFERENT NUTRIENT MANAGEMENT PRACTICES AND CROPPING SYSTEMS IN VERTISOL OF NORTHERN TRANSITION ZONE OF KARNATAKA
Abstract: A long term field experiment was conducted on a Typic Haplustert at MARS, Dharwad which stated during 2004-05. The experiment comprises of four nutrient management practices (organic, inorganic, integrated and RDF+FYM) and five cropping systems (groundnut-sorghum, soybean-wheat, maize-chickpea, pigeonpea+ soybean and cotton+peas). After eight years of continuous cropping, the effect of different nutrient management practices was studied on different forms of carbon, nitrogen, phosphorus, sulphur and soil microbial activities. Organic carbon (6.7 g/kg), water soluble carbon (56.7 mg/kg), labile carbon (960 mg/kg) and total carbon (20.6 g/kg) were significantly higher in the treatment that received continuous application of organic manures than inorganic nutrient management practice (5.2 g/kg, 38.4 mg/kg, 723.7 mg/kg and 12.1 g/kg, respectively). Similarly, NH4-N (28.7 mg/kg), NO3-N (9.6 mg/kg) and total-N (664.1 mg/kg) showed statistically higher values in the treatment which received organic manures application. All the forms of nitrogen were significantly and positively correlated with each other. Significantly higher P fractions in the order Ca-P>Al-P>Fe-P>occluded-P>saloid-P were recorded in conventional method of farming while available-P were statistically lower in this system. All the fractions of phosphorus were highly inter-related and significantly correlated with each other. Sulphate-S (24.8 mg/kg), organic-S (337.8 mg/kg) and total-S (362.6 mg/kg) were significantly higher in the treatment which received organic manure application followed by integrated and inorganic nutrient management practices. All the forms of sulphur were significantly correlated with each other. Hundred percent organic management practice increased the soil enzyme activity (urease, phosphatase and dehyrogenase) and soil microbial biomass carbon and nitrogen and significant positive correlation existed between them. Organic nutrient management practice resulted in improvement of soil physical (bulk density, porosity and maximum water holding capacity), chemical (organic carbon and CEC) and biological properties. Improvement was seen in all the forms of carbon, nitrogen and sulphur and available-P content in soil under organic nutrient management practice.
Subject: Soil Science and Agriculture Chemistry
Theme: STUDIES ON THE TRANSFORMATIONS OF CARBON, NITROGEN, PHOSPHORUS AND SULPHUR UNDER DIFFERENT NUTRIENT MANAGEMENT PRACTICES AND CROPPING SYSTEMS IN VERTISOL OF NORTHERN TRANSITION ZONE OF KARNATAKA
These Type: M.Sc
Issue Date: 2014-07
Appears in Collections:Thesis

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