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Effect of Corn Hybrids, Row Spacing, and Plant Population on the Yield of Corn Silage¹

A number of corn (Zea mays L.) hybrids differing in maturity were grown in varying plant populations and row spacings at two locations in Virginia over a three-year period to determine silage yield and chemical composition.

In 1966, yields from the alternated 25 and 125 cm spacings were lower than from the other uniform spacings at both locations, with no differences in yield among the other spacings. Yields were not increased with increased population in 1966. In three of four location-year tests in 1967 and 1968, yields were higher with the 40 than with the 100 cm spacings. Yields were higher with the late maturing hybrid and with the highest plant population. Stalk diameter was affected by row spacings but not by populations or hybrids. The N, P, and K contents of leaf samples were not differentially affected by hybrids, populations, or spacings in 1966. The P content of leaf samples decreased with increased population in 1967 but was unaffeced by hybrids and row spacings.

Key Words: Zea mays L. • Leaf composition • Corn planting patterns

² Assistant Professors of Agronomy, Virginia Polytechnic Institute, Research Division.

Received for publication May 10, 1969.