Two field experiments, one direct and one residual crop. were conducted using Zn deficient soil (DTPA-Zn 1.1 ppm) to study the direct and Residual effect of different levels of ZnSO. (0, 12.5 and 25 kg/ha, and different sources and levels of organics viz: FYM (7.5 and 15 t/ha) poultry manure (10 and 20 t/ha) and pig manure (25 and 5 t/ha) either alone or in combination on maize yield. The results indicated that the addition of ZnSO, plus organic manures to main crop, significantly increased the DTPA-Zn in the post-harvest soil of main crop and in the soil collected as vegetative stage of the yesidual crop. The combined appli- cation of pig manure at 5 tons along with 12 5 ZnSO./ha increased the grain yield. of the residiual crop Viz: Maize-Ganga-5 by 31 per cent over NPK treated control.
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