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Effects of High Nitrogen Fertilization and Lodging on Rice Yield¹

Synopsis: Application of 100 pounds N per acre gave optimum yield of rice, provided plants did not lodge before heading. Pre-heading lodging reduced level of nitrogen consumption and response and the yield. Lodging seemed to be a physiological phenomenon rather than a varietal character. It originated from structural weakness development in culm tissues and was caused primarily by deeper submergence of plants during vegetative growth aided by high nitrogen concentration in soil.

² Deputy Director of Agriculture (Manure) and Assistant Biochemists. The paper was written during Rockefeller Foundation Fellowship of the senior author at Kearney Foundation of Soil Science, University of California, Berkeley. The authors are grateful to H. K. Nandi, Director of Agriculture, West Bengal Govt., for his interest in the work and to B. Saha for anatomical examination of culm tissue. C. C. Delwiche, Kearney Foundation of Soil Science, kindly read the manuscript.

Received for publication December 11, 1961.

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