EFFECT OF INTEGRATED NITROGEN MANAGEMENT ON SOIL MICROBIAL POPULATION AND GRAIN YIELD OF BASMATI RICEP.K. Gill and C.S. AulakhAbstract A field experiment was conducted at Punjab Agricultural University, Ludhiana during 2010 to study the effect of integrated nitrogen management on soil microbial population and grain yield of basmati rice. The experiment was laidout in a randomized block design and with four replications 13 treatment combinations of chemical fertilizer, green manuring (GM) with Crotalaria juncea, farmyard manure (FYM) and organic preparations [OP (Jeevamrit and Panchagavya)]. The highest grain yield (34.9 q ha-1) was obtained with application of FYM @ 19.76 t ha-1+50 per cent of recommended nitrogen and it was statistically at par with combination of green manure (GM) + FYM + organic preparating (33.7 g ha-1) and GM + FYM (33.4 g ha-1). Green manure alone was sufficient to produce grain yield equivalent that with recommended nitrogen of 40 kg ha-1. Organic sources of N alone or their integrated use with chemical fertilizer increased the microbial population in soil.
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