Effect of the organic manures and copper fertilisation on copper fractions in soils

摘要

Field experiments was conducted in maize with organic manures (poultry manure 6.25 t ha~(-1) and FYM @ 12.5 t ha~(-1)) and copper sulphate at different levels and methods (6.25,12.5,25 and 50 kg CuSo_4 ha~(-1) and 0.1 and 0.2% foliar spray thrice on 30~(th), 40~(th) and 50~(th) day after sowing). Organic manure application was found to have non significant effect on copper fractions whereas increasing levels of CuSO_4 increased the copper fractions significantly. Bulk of the soil copper was in the residual form. The percentage of added copper that was found in organic fraction was much higher than that with other fractions. Path analysis study revealed that direct contribution of inorganic copper towards DTPA-Cu was the highest.