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Effect of Planting Date on High-Amylose Corn (Zea mays L.)¹

Four high-amylose single cross hybrids were planted near Columbia, Missouri, for the 4-year period 1962 through 1965 on the following dates: April 20th, May 10th, June 1st, and June 20th. Amylose content of the endosperm and number of degree days during the growing season were inversely correlated with later plantings having higher amylose contents. However, later planted corn had a lower yield, test weight, whole kernel nitrogen content, kernel hardness, and number of days to tassel. Whole kernel ash content and ear height increased with later planting. It is doubtful if the increased amylose content of the endosperm will offset the reduced agronomic performance of later plantings.

Key Words: amylopectin • starch • degree days • heat units

² Instructor and formerly Assistant Professor (now Specialty Plant Breeder, Bear Hybrid Corn Company), Department of Agronomy, University of Missouri, Columbia 65201.

³ Research Agronomist, Crops Research Division, ARS, U. S. Department of Agriculture, and Professor, Department of Agronomy, University of Missouri.

Received for publication March 9, 1968.