Author(s): S. BERA AND R. K. GHOSH

Abstract: Field experiment was undertaken during 2010-2012 to evaluate the nutrient recycling and production potential of rice based cropping sequences. After kharif (rainy) rice, onion and greengram were grown during rabi (winter) and pre-kharif (pre-monsoon) season, respectively. The biomass of weeds were composted and incorporated into the soil. Significantly maximum system pooled yield (24.3951 ha-1) was recorded in the treatment Parthenium and Calotropis leaf extract @ 5% v/v at 1 DAS/DAT+HW at 21 DAS/DAT (W2) and it was statistically at par with farmer practice (23.780 t ha-1). The system yield of the plots receiving W2 treatments were recorded 17.57% higher than farmer practice. The maximum system yield was (25.679 t ha-1 pooled data) registered under 40% recommended N+20% N through neemcake+40% N through weed compost+full PK (N6) which was found statistically at par with 50% recommended N+20% N through neemcake+30% N through weed compost+full PK (N5). The percentage increase in system yield in the plots receiving N6 and N5 was 25.00% and 22.47%, respectively higher over that receiving 100% recommended NPK (N1). Nitrogen balance was positive under all treatments of weed Management ranging from 90.15 to 195.44 kg ha-1 after completion of two cropping cycles. Only negative balance was recorded in case of N1 (-123.28 kg ha-1). Maximum N balance was recorded in case of N6(+335.20) which was followed by N5 (+253.26 kg ha-1), N4

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