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Published online 1 May 1968
Published in Agron J 60:263-267 (1968)
© 1968 American Society of Agronomy
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Influence of Row Spacing and Nitrogen Fertilization on Grass Seed Production1

C. L. Canode2

The seed production capabilities of five species of cool-season grasses as influenced by three row spacings and three nitrogen rates were determined for a 5-yr period. The conclusions here are based on the 4- or 5-yr cumulative average seed yields.

Kentucky bluegrass produced more seed in 30- and 60-cm rows. Crested wheatgrass and smooth bromegrass seed production was higher in 60-cm rows, but for smooth bromegrass the difference in seed yield for the 60-cm rows was not significantly higher than those of the 90-cm rows. Orchardgrass produced more seed in the 90-cm rows. Row spacing did not influence the seed yields of red fescue.

Kentucky bluegrass and orchardgrass responded with more seed when fertilized with nitrogen at 90 or 112 kg/ha. Crested wheatgrass produced more seed with 112 kg/ha of nitrogen, but the differences were only significant in the 4-yr average yields. Nitrogen rates over 67 kg/ha did not increase the seed yields of red fescue and smooth bromegrass.

The 90-cm rows resulted in heavier seed than that produced in 60- and 30-cm rows. The 112 kg/ha of nitrogen increased seed weight in red fescue, but decreased seed weight of smooth bromegrass. Nitrogen rates did not influence the weight of crested wheatgrass seed.

Key Words: Kentucky bluegrass • red fescue • bromegrass • orchardgras • crested wheatgrass

1 Cooperative investigations of the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, and Washington Agricultural Experiment Stations. Scientific Paper No. 2901. College of Agriculture, Washington State University, Pullman, Wash.

2 Research Agronomist, Crops Research Division, ARS, USDA, Pullman, Wash. 99163.

Received for publication October 27, 1967.




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Copyright © 1968 by the American Society of Agronomy.