Three rates of nitrogen fertilization, 20, 40, and 80 pounds per acre, were applied to oats at seeding time and 2, 4, and 6 weeks later. When compared with the seeding data, delaying the application of 20 and 80 pounds of nitrogen caused a decrease in relative grain yields. At the 40-pound rate, increases in relative yields due to applying the nitrogen 2 and 4 weeks after seeding were observed. The yield response to delayed application of 20 pounds of nitrogen per acre resulted from a reduced relative number of seeds per head, while the 80 pound response was due both to reduced relative seed size and number of seeds per head. The increase in relative grain yield from 40 pounds of nitrogen applied 2 to 4 weeks after seeding was caused by an increased relative number of heads per plant and seeds per head.
Proceedings of the Iowa Academy of Science
© Copyright 1959 by the Iowa Academy of Science, Inc.
Frey, Kenneth J.
"Yield Components in Oats. IV. Effect of Delayed Application of Nitrogen,"
Proceedings of the Iowa Academy of Science, 66(1), 137-142.
Available at: https://scholarworks.uni.edu/pias/vol66/iss1/17