Effect of different organic manures, tillage methods and crop residue management on the availability of micronutrients

摘要

Field experiments were conducted with sorghum (Co.26) - soybean (Co.1) cropping sequence in Typic Ustropept soil with different tillage operations and manure treatments. The post harvest soil samples of soybean were analysed for DTPA-Zn, Cu, Fe and Mn content. The results showed that incorporation of organic manures (coirpith, poultry manure, goat manure and FYM) increased the available Zn and Fe content, while the availability of Cu was not influenced by the incorporation of organic manures. Ploughing with country plough and burning the stubbles in situ significantly increased the Zn content, while for Fe it was C_2 (country ploughing and composting the stubbles in situ) and for Mn, C_1 and C_2 recorded the highest value. As regards DTPA-Cu, disc ploughing under dry condition recorded the highest value. All the four micronutrient cations were higher in the surface soil than in sub-soil.