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Effects of Seeding Rate and Row Spacing on Establishment and Yield of Crested Wheatgrass¹

Seeding rate affected stand establishment and survival, and row spacing influenced seedstalk height, herbage yield and protein content of crested wheatgrass (Agropyron desertorum (Fisch. ex Link) Schult.) on range seedings in northern Colorado. In rows seeded in the spring of 1960, 1961, and 1962 at 33, 66, and 98 seeds/m, number of seedlings per m of row increased with seeding rate, but the percentage of seeds producing seedlings generally declined with increasing rate. Stand survival in 1967 (when the study was terminated) was significantly better at the 98-seed rate than at the 33-seed/m rate. Herbage yields averaged highest for row spacings of 30 and 46 cm; intermediate at spacings of 15 and 61 cm; and lowest for the 76-cm spacing. However, yields varied widely among row spacings due to year of seeding, weather conditions and age of stand. Seedstalk height increased as row spacing became wider. Row spacing did not affect protein content of the 1963 harvest, but in 1964 the percent crude protein declined as row spacing increased.

Key Words: Stand survival • Protein content • Seedstalk height

² Range Scientist, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Fort Collins, Colorado 80521.

Received for publication November 17, 1969.