Substitution of nitrogen requirement of rice (Oryza sativa) through organic and inorganic sources of nutrients in irrigated sub tropical foot Hills of Jammu

Abstract

An experiment entitled “Studies on direct and residual effects of organic and inorganic sources of nutrients in rice-wheat cropping system” was conducted at research farm, FOA, Main Campus Chatha of SKUAST-Jammu during kharif season of 2006-07 and 2007-08. The soil of experiment site was sandy loam in texture with slightly alkaline in reaction (pH-8.1), medium in organic carbon (0.55 percent), low in available nitrogen and medium in available phosphorus and potassium. The field trial of Rice variety PC-19 was laid out in RBD. The treatments consisted of control, 100 percent N through vermicompost and farmyard manure and inorganic fertilizer (NPK) and in combination with 25 -50 percent N through vermicompost and farmyard manure.). Application of 100 inorganic fertilizer (NPK) brought about significant improvement in yield attributes and yield of rice (number of panicles m-2, length of panicles, grain weight panicle-1, number of grains panicle-1 and 1000-grain weight over the application of organic sources of nutrients and their combination with inorganic fertilizer during 1st year. Application of organic sources of N through vermicompost in the ratio of 75:25 (T8) increased the grain and straw yield significantly as against the rest of the organic sources and their combinations. Where as during 2nd year combination of vermicompost and inorganic fertilizer (75: 25) found to produce significant influence on yield attributes, yield of rice.