Merle D. Witt, R. L. Vanderlip, L. D. Bark, Effect of Row Width and Orientation on Light Intercepted by Grain Sorghum, Transactions of the Kansas Academy of Science (1903-), Vol. 75, No. 1 (Spring, 1972), pp. 29-40
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Witt et al. (1972) studied this question.
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