Effect of Light Intensity on Growth of Soy Beans and Its Relation to the Autocatalyst Theory of Growth

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Abstract
Four varieties (Peking, Mandarin, Biloxi, and Ito San) were grown under 6 different light intensities, averaging 4285, 1536, 560, 390, 250, and 26 ft.-candles respectively. All plants twined except those grown under 4285 and under 26 ft.-candles. The lower the light intensity the more rapid was the rate of stem elongation during the initial period of growth, but the greatest final height of each variety was obtained under 560 ft.-candles and the lowest under 26. Thickness of stems was roughly proportional to light intensity. All plants except those grown under 26 ft.-candles gave typical S-shaped curves of growth; these are associated with the internal food relations, the first part of the curve with the development of independence in the seedling and the latter part with flowering and fruiting.

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