Effect of organic and inorganic sources of nutrition on productivity of rice (Oryza sativa)*

An experiment consisting of 13 treatments was conducted at Pantnagar, during 1999 and 2000, to assess the effect of crop residue, nitrogen doses and FYM applied to rice (Oryza sativa L). Wheat (Triticum aestivum L emend. Fiori & Paol.) straw @ 5 or 10 tonnes/ha resulted in higher values of yield attributes (panicle length, filled spikelets/panicle and 1, 000-grain weight) and grain and straw yields of rice compared to the control. Increasing dose of nitrogen increased yield attributes and grain yield of rice significantly, wherein, application of 100% recommended dose of N recorded more panicle length, filled spikelets/panicle and 1, 000-grain weight and consequently grain yield and NPK uptake. FYM @ 20 tonnes/ha also resulted significantly higher values of yield attributes, grain yield and nutrient uptake of rice over the control and wheat straw applied @ 5 or 10 tonnes/ha as well as 50% N used alone. Integrated use of wheat straw @ 10 tonnes/ha + 100% recommended dose of N resulted in maximum values of yield attributes, grain yield as well as, NPK uptake by rice. Use of organic sources helps in maintaining soil fertility, whereas with chemical fertilizers a significantly decline was observed.