Effect of organic and inorganic sources of N on growth attributes, grain and straw yield of rice (Oryza sativa)

Abstract

The present investigation was carried out at the Agricultural Research Farm, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi during Kharif seasons of 2001 and 2002, in agro–ecological zone V of India. The soil of experimental site was sandy clay loam in texture with normal pH, low in nitrogen and phosphorus and medium in organic carbon and potassium contents. The experiment was laid out in Randomised Block Design with nine treatments replicated thrice. The treatments were applied to rice crop during kharif season. Application of recommended doses of fertilizer (T₉) brought about maximum  improvement in the different growth attributes such as total tillers, dry matter production and LAI in comparision to other sources of organic N carriers.  These attributes were also observed to increase significantly over control due to various organic N sources among which the combination of three organics (T₈ – 40 kg N through D.S + 40 kg N through P.M + 40 kg N through C.W) proved to be superior. Application of N through chemical fertilizer (T₉) brought about significant improvement in grain and straw yields of rice crop and established superiority over rest of the treatments. Among organic N sources, supplication of N through combination of D.S + P.M + C.W @ 40 kg N ha^-1each (T₈) increased the grain and straw yield significantly as against the application of rest of the organic N sources and the control (T₁) except the straw yield due to incorporation of P.M alone (T₃) which remained at par.