Zinc (Zn) is the most important micronutrient required for sustainable crop production, particularly for rice and wheat crops. Therefore, on-farm trails (OFTs) were conducted at seventeen different locations during 2006-08 to evaluate the direct and residual application effect of Zn, applied through zinc sulphate heptahydrate under rice-wheat (RW) cropping sequence.

A green-house experiment on three sub-tropical semi-arid soils was conducted to investigate the effect of different sludge types of coca-cola soft drink industry viz. water treatment plant sludge (WTS), effluent treatment plant sludge (ETPS) and filter cake sludge (FCS) applied @1.0, 2.0 and 4.0 per cent on dry matter yield and heavy metal content in Palak.