Analytical studies on the productive efficiency of nitrogen in rice

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Abstract
The concept of productive efficiency of nutrients has been discussed at length by Kimura and Chiba (1943)1). Considering that the effect of a nutrient for the production of grain and straw may be divided into several growing periods of plant.life, Kimura and Chiba (1943) conducted water culture experiments to study the effect of nitrogen absorbed at a definite period on the production of grain and straw. The total productive efficiency was divided into several partial efficiencies based upon the growing period of the rice plant. The following is a summary of their findings.