Synopsis Spring yields of crested wheatgrass were more than doubled by application of 30 pounds per acre of N and were directly related to April and May temperatures but inversely related to the amount of fall and winter precipitation over a 4‐year period. Annual yields were directly related to fertility rate, and to the amount of precipitation received in the preceding November 1 to June 1 period. Counting residual response, the 20 pounds per acre fertility rate returned 25 pounds of herbage per pound of N applied.
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Sneva et al. (1958) studied this question.
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