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Effects of Manurial Treatments and Times of Planting on Rice Production in Different Soil Types in West Bengal¹

Synopsis: Thirty pounds of N per acre caused a significant increase in yield. Responses to bulky organic manure and ammonium sulphate, alone or in combination, were practically identical. Lateritic soils showed a higher grain-producing capability than low-land Gangetic alluvium soils of higher fertility status. Yields of grain decreased progressively with delay of planting from mid-July to mid-September. Time of application of ammonium sulphate had no influence on rice yield. Split applications were moderately superior to composite applications.

² Bio-chemist, West Bengal Agricultural Institute, and Group Leader, University of Missouri Technical Cooperation Mission to India, respectively. The authors express thanks to Dr. H. K. Nandi, Director of Agriculture, West Bengal, for permission to publish this paper.