Nitrogen Dynamics in Rice under Rice-Wheat Cropping System at Khumaltar Condition
AbstractNitrogen fertilization is a key input in increasing rice and other crop production in the world. Realizing the issue, nitrogen dynamics Lalitpur, Central Nepal was studied in long-term experiment under rice-wheat cropping system at rainfed lowland condition of Khumaltar The first objective of the experiment was to assess the contribution of organic, inorganic and biological nitrogen fixation (BNF) for the better nitrogen cycling and utilization of added and residual nitrogen by crops. The second objective was to quantify the N03- -N and NH4+ -N in puddled soil at different soil depths and growth stages of rice in rotation with rice based wheat-cropping pattern.The nitrogen (N) level was used 0,50, and 100 kg N per ha The NH4+ -N and N03- -N dynamic in three soil depth (0-15, 15-30 and 30-60 cm) were monitored and crop performance evaluated in terms of grain and straw yield.The rice grain and straw yield were observed in the higher N-addition and incorporation of soybean stubble.The N03- -N and NH4+ -N in the soil were also higher in the soybean incorporation treatment than in other treatments. Higher NH4+ -N was absorbed at maximum tillering stage than after rice harvest.
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