Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 September 1968
Published in Agron J 60:560-562 (1968)
© 1968 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Effects of Nitrogen Fertilizer on an Old Stand of Crested Wheatgrass1

William J. McGinnies2

Nitrogen fertilizer, in the form of urea, was applied to a 16-year-old stand of crested wheatgrass [Agropyron desertorum (Fisch. ex Link) Schult.] at rates of 0, 22, 45, 67, 90, and 112 kg N/ha/yr. Annual and biennial applications were made over a 6-year period starting in 1962. Average herbage yield was increased by the addition of N at all rates. The greatest increase in herbage yield per kg N applied was at the 22-kg/ha rate; the increase in yield per kg N applied declined as the rate of N increased. Total average herbage yield was highest at the 67-, 90-, ll2-kg rates. Annual fertilizer applications produced significantly higher average yields than biennial applications. The unfertilized plots declined in productivity during the period covered by the study, but as little as 22 kg N/ha/yr appeared to prevent the stand deterioration.

A one-time-only application of 0, 22, 45, 67, 90, 112, 135, 180, 225, and 449 kg N/ha was applied in 1962. The 22- and 45-kg/ha rates increased herbage yield in the first year, and 67- to 225-kg/ha rates increased yields through 1965. The 449 kg/ha rate increased yield through 1966, but had no significant effect in 1967.

The magnitude of the response to N and the relative efficiency per kilogram applied depended upon moisture availability.

Key Words: Agropyron desertorum • range fertilization • urea

1 A contribution of Crops Research Division, Service, U. S. Department of Agriculture, in cooperation with Rocky Mountain Forest and Range Exp. Sta., Forest Service, USDA, and Colorado Agr. Exp. Sta. Published with the approval of the Director of the Colorado Agr. Exp. Sta. as Scientific Series Paper No. 1291.

2 Range Scientist, Crops Research Division, ARS, USDA, Fort Collins, Colo. 80521.

Received for publication April 8, 1968.




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Copyright © 1968 by the American Society of Agronomy.