A field experiment was conducted at ARS. Bhavanisagar, to study the N release pattern of green manure before and after rice transplanting in sodic soil. Production of N fractions (NII, N and NO, N) were higher with the green manure crop Seshania aculeata before rice transplanting and gypsum application when compared with green leaf manure crop Pongamia glabra due to its higher N content and instantaneous. easy decomposition. In the presence of rice crop. the NH, N reached the first peak during third week and second peak during sixth week whereas NO, N recorded the peak during ninth week in all the treatments. The higher N fractions were recorded in green manure. (GM) gypsum treatment and lowest in gypsum alone treatment.
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