EFFECT OF VARYING FERTILITY LEVELS ON PRODUCTIVITY OF CROPPING SYSTEMS UNDER IRRIGATION IN SEMIARID REGIONS OF INDIA

In an experiment conducted from 1985-86 to 1992-93 indicated that pear l millet [Pennisetum glaucum (L.) R. Br. emend. Stuntz]-wheat (Triticu m aestivum L. emend. Fiori & Paol.) cropping system with green-manurin g in summer gave high grain and biomass productivity/ha per rupe inves ted on fertilizer than other crop sequences and reduction in fertilize r dose to 50% of both the crops Groundnut (Arachis hypogaea L.)-wheat cropping system with 100% recommended fertilizer/ha was found highly r emunerative with high net returns/ha and benefit : cost ratio than oth er crop sequences. However, reduction of 25% recommended level of fert ilizer to wheat in groundnut-wheat cropping systems did not affect muc h productivity/ha, net return/ha, benefit : cost ratio per rupee inves ted on fertilizer compared with to 100% recommended fertilizer to both the crops.