Author(s): A. M. Deka, P. C. Bora, H. Kalita, B. Guha and R. Chakrabarty

Abstract: field experiment was conducted at Shillongani, Regional Agricultural Research Station, Nagaon, Assam during kharif - rabi seasons in the year 2014-15 and 2015-16 to study the effect of dates of transplanting under different methods of cultivation on productivity of winter rice (Oryza sativa L.) and their effect on rice-pea (Pisum sativum) relay system. Rice transplanted on 20^th June recorded significantly higher yield attributes and grain yield of rice as compared to the later dates of transplanting, and it was followed by the 5^th July- transplanted rice. Transplanting on 20^th June resulted in higher values in respect of yield attributes, yield of relayed pea, rice equivalent yield (REY) of rice- pea relay system, NPK uptake by rice and pea as well as soil fungal and bacterial population after harvest of rice and pea. System of Rice Intensification (SRI) recorded significantly higher values of yield attributes and grain yield of rice as compared to conventional method. In case of pea, yield attributes, seed yield and REY were found slightly higher under conventional method of rice cultivation. Under SRI method, higher uptake of NPK by rice and pea and higher soil fungal and bacterial populations after harvest of rice and pea were observed as compared to conventional method. However, conventional method of rice cultivation recorded significantly higher values of soil available N, P₂O₅ and K₂O content at the end of two year-crop cycle over that of SRI.

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