The present study conducted as a research project with the use of Purnell funds was designed to acquire information concerning the diurnal variation in the amounts of carbohydrates in the leaves of corn plants. It was assumed that the variations of light and temperature between periods when the amounts of carbohydrates were determined might be associated with the conditions of growth of the plants, not only as to light and temperature during the day and night, but likewise by the stage of growth of the plants themselves. Two strains of corn were therefore employed, one of which had been observed to be of early maturity, and the other of later maturity. Presumably two such different strains might represent different degrees of maturity of corn plants, at a given time when leaf-samples might be taken, for the determination of carbohydrates therein. The time for taking these leaf samples was somewhat arbitrarily selected when the corn plants were still in active growth, but fairly mature. The early strain in the several seasons whether growing in the greenhouse or field was usually fully tasseled and silked; the later strain evidently not so far advanced. The computations and discussions in this bulletin are based on the amounts determined quantitatively of photosynthetic products in the leaf samples taken at periods indicated and analyzed for sugars and starch.
corn, corn leaves, corn carbohydrates, chemical composition corn
South Dakota Experiment Station, South Dakota State College of Agriculture and Mechanical Arts
Puhr, L.F. and Hume, A.N., "Variations in Amounts of Carbohydrates in the Leaves of Corn" (1932). Research Bulletins of the South Dakota Agricultural Experiment Station (1887-2011). 270.