Residual effect of organic manure and influence of nitrogen fertilizer on soil properties and performance of wheat

Abstract

In a rice-wheat cropping sequence soil was tested after harvest of wheat, which showed that addition of organic matter during the preceding crop improved the soil organic carbon content double to its original status. Total and available nitrogen content was also significantly improved by organic matter, but has less impact on soil exchangeable cations. Bulk density was sharply reduced and saturated hydraulic conductivity of upper soil layer was increased accordingly. Infiltration rate was initially higher, but became lower due to high compaction in subsurface soil layer. Total organic carbon in plant at different growth stages increased significantly with increasing level of fertilizer nitrogen. Grain yield of wheat varied between 1.33 t/ha in control and 2.62 t/ha in plots where compost was previously incorporated. Application of ipilipil leaves as green manure (Gm), cowdung (Cd) and compost (Cp) during previous cropping of rice created positive impact in increasing crop yield to a variable degree. Fertilizer nitrogen had significant impact on yield components of wheat