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Abstrato

Effect of organic and inorganic sources of nitrogen on Fe, Mn, Cu and Zn uptake and content of rice grain at harvest and straw at different stages of rice (Oryza sativa) crop growth

Debiprasad Dash, Hrusikesh Patro, Ramesh C. Tiwari and Mohammad Shahid

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. Incorporation of chemical fertilizer (T9) enhanced the contents of micronutrients in plants and, obviously, their uptake in plant and grain and straw at harvest in comparison to rest of the N sources. Though various organic N sources significantly increased the contents and the uptake of respective micronutrients in plant at various stages over the control (T1), the maximum improvement in the contents and uptake of micronutrients were recorded in the treatment receiving all the organics @ 40 kg N ha-1 each (T8) among the treatments receiving organics alone or in combination. 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.