Influence of varied crop residues and green biomass composts to rabi sorghum growing soils on uptake of major nutrients, microbial biomass and soil fertility status

Abstract

A field experiment was conducted on vertisols (pH of 7.56 with organic carbon content of 0.55%) at Research Institute on Organic Farming, University of Agricultural Sciences, Raichur coming under northern Karnataka during rabi season of 2015-16 to study the Influence of varied crop residues and green biomass composts to rabi sorghum growing soils on uptake of major nutrients, organic carbon and soil fertility status. In general application of Cotton stalks, Redgram stalks, Glyricidia, combination of cotton and redgram stalks composts, FYM and combination of organic and inorganic fertilizers helped to buildup soil nutrients with respect to organic carbon, available nitrogen and phosphorus. Significantly higher nitrogen (227.3 kg ha