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Leaf Area in Relation to Yield of Corn Grain¹

Yields of corn grain tended to be linearly related to the leaf area indexes at silking time and to the leaf area index days over the grain formation period. The linear relationship did not continue beyond the leaf area index value of 3-3 or beyond the value of leaf area index days of 155. Considering the change in leaf area during the period of 45 days after silking did not improve the relationship in any one experiment, but did improve the relationship among different experiments. No consistently better relationship was found to exist between various portions of leaf area from the top of the plant and the final grain yields than between the total leaf areas and grain yields. During the period of most rapid dry matter accumulation the quantity of total dry matter accumulated per plant on any date was proportional to the accumulated leaf area days.

² Research Associate and Professor of Soils.

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