Relation of leaf area to grain yield in sorghum
1941
Swanson, A.F.
The leaf area per stalk of five varieties of grain sorghum differing in maturity, height, and size and number of leaves were measured during five consecutive years. The total leaf area per acre ranged from about 21,000 to more than 190,000 square feet. The average leaf area per stalk ranged from about 0.64 to 5.742 square feet, depending on the variety and season. The approximate requirement for the production of 1 bushel of grain was 4,000 to 11,400 leaves, having a total area of 570 to 3,800 square feet. Thus, for each leaf per stalk functioning during the fruiting period the grain yield was 3.5 bushels to 6 bushels per acre. Abundant rainfall during the vegetative period stimulated leaf development. Less leaf area was required to produce a bushel of grain in a dry year than in a wet year, but the highest yields were obtained in seasons of abundant rainfall.
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