Abstract

Studies on cumulative and residual effects of integrated nutrient management of kharif rice on humic substances, micronutrient status and their uptake by rabi greengram were conducted at Regional Agricultural Research Station, Anakaplle during rabi 2009 and 2010. There were 12 treatments of integrated nutrient management imposed on preceding rice crop that formed the main plots and each plot was divided into two halves and 50% recommended dose of chemical fertilizers of greengram i. e. 10 and 20 kg N and P/ha was applied to one half, while the crop in the other half plot was studied under the residual effect. Results revealed that the values of available micronutrient status, their uptake and humic substances were higher with integrated nutrient management practices, specially when vegetable market waste vermicompost was applied. With continuous chemical farming, there was a slight reduction in the soil micronutrient status, nutrient uptake and humic substances. Conjunctive application of organics along with inorganics exhibited higher seed yield of rabi greengram with high micronutrient uptake and soil humic substances over application of inorganics only.