تلخیص
Nitrogen, a major and vitally important plant nutrient, is subjected to a variety of losses which affect its efficiency. Various sources viz prilled urea (PU), urea supergranulcs (USG), green manures (GM) and barnyard manure (BM) were employed in rice to work out the efficient and economical N source. N-rate for either treatment was maintained at 87 kg N ha . Maximum gain in terms of rice growth, yield and N-uptake was induced by USG and GM IS. rostrata) + PU. Incorporation of GM resulted in a saving of 60 kg N ha" . On the succeeding wheat crop, GM (S. aculeata) + PU and BM+PU gave more residual effect than all other sources for tiller number m , straw and grain yields and N-uptake. whereas plant height difference remained non significant among the sources. In areas where USG is costly or unavailable and BM is also in short supply, the small scale farmers can find the green manures a cheaper N source to get sustainable yields in rlce-whcat rotation. A simple and cheep equipment for the purpose of rotavation of green manures has been proposed.
Tahir Hussaln, , Ghulam Jilanl , M. Zafar Iqbal* . (1988) INTEGRATED USE OF ORGANIC AND INORGANIC N FERTILIZERS IN RICE-WHEAT CROPPING SYSTEM , The Journal Soil & Environment , Volume 3, Issue (3-4).
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