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Conference Proceeding: ASSESSMENT OF NUTRIENTS STATUS IN COTTON GROWING AREA OF HAVERI DISTRICT IN NORTHERN TRANSITIONAL ZONE OF KARNATAKA AND RESPONSE OF COTTON TO APPLIED NUTRIENTS AT DIFFERENT YIELD TARGETSN.R.Mamaledesai, P.L.Patil, C.P.Chandrashekar, M.P.Potdar, S.A.Astaputre, S.R.Desai and Hanumantha Swamy
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ABSTRACT: Cotton being deep rooted crop removes large quantities of nutrients from the soil profile. Nutrient management in cotton is complex due to the simultaneous production of vegetative and reproductive structures during the active growth phase. It is seen that many farmers in the study area do not apply the required quantity of fertilizers and the application is non uniform. This has led to lower yields and creation of lot of spatial variation in nutrients under the similar management situation. In view of this an experiment was conducted to study nutrients status of cotton growing area for precision application of nutrients. Bisanahalli, in Haveri district of Karnataka is selected for this study. 178 samples were collected from 40 hectare cotton growing area. The location of the sample was recorded using GPS. The samples were processed and analysed for available nutrients status. Soil pH range from 5.74 to 8.6 with EC 0.08 to 0.84 dS/m. Organic carbon values range from 2.4 to 14.2 g/kg soil. 52 per cent samples low and 48 per cent samples were medium in available N status. With respect to P, 20 per cent samples were low, 69 per cent samples medium and 11 per cent samples high in available status. Available K status was low in 7 per cent samples, medium in 71 per cent samples and high in 22 per cent samples. Available Fe status was high, ranging from 2.9 to 92.7 ppm. Available Zn ranged from 0.28 to 6.5 ppm. Available Cu ranged from 0.66 to 3.6. Available Mn was in the range of 0.26 to 20.6 ppm. Based on this information, a field experiment on cotton at 20 and 25 q/ha, 25 and 30 q/ha yield target was planned for Alfisols and Vertisols respectively as the area has associated red and black soils. Calculated nutrients based on nutrients requirement of cotton and soil test results was applied to achieve the yield target. Yield target was achieved under Vertisols at all the nutrients status, where as, it was not achieved under Alfisols due to soil moisture constraints.AIPA2012, IIIT HYDERABAD; 08/2012
