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Effect of rates and methods of urea-N application and presubmergence periods on ammonia volatilization losses from rice fields in a sodic soil



Effect of rates and methods of urea-N application and presubmergence periods on ammonia volatilization losses from rice fields in a sodic soil



Journal of Agricultural Science 125(1): 95-98



In a field experiment with transplanted rice (Oryza sativa L.) during the wet season of 1990 at the Central Soil Salinity Research Institute, Karnal, India, the effects of four rates of N application (0, 80, 120 and 160 kg N/ha), two methods of urea application (before puddling, M-1, and after puddling, M-2) and two presubmergence periods (none, S-0, and 1 week, S-1) were evaluated on ammonia volatilization losses in a sodic soil (pH 9.0, exchangeable sodium 29%). Cumulative ammonia volatilization losses were 1.43, 18.00, 22.54 and 28.29 kg/ha following applications of 0, 80, 120 and 160 kg N/ha respectively; 17.08 and 18.01 kg/ha for treatments M-1 and M-2 respectively; and 18.63 and 16.34 kg/ha for treatments S-0 and S-1 respectively. Flood-water NH-4+ and pH increased during days 1-4 and then there was a sharp decline on days 4-9, followed by a gradual decline. The highest flood-water NH-4+ and pH values were found for the treatments which received urea at the rate of 160 kg N/ha, after puddling (M-2) and with no presubmergence period (S-0).

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Accession: 002604031

Download citation: RISBibTeXText

DOI: 10.1017/s0021859600074542



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