Nitrate Accumulation in Smooth Bromegrass (Bromus inermis, Leyss.): I. Effects of Applied N, P, and K
1970
Vanderlip, R. L. | Pesek, John
The NO₃₋N content of smooth bromegrass (Bromus inermis, Leyss.) was determined for two N, P, and K fertilizer experiments in each of 2 years (1962 and 1963) on Shelby silt loam in south-central Iowa to determine the extent to which nitrate would accumulate in this species and the effects of these nutrients on accumulation. Nitrate-nitrogen content of the forage was determined by steam distillation on samples taken periodically throughout the growing season and related to rates of applied N, P, and K and. time after fertilization and time after clipping by multiple regression techniques. All three elements affected the NO₃₋N content; however, the effects varied among site-years. The effects were interrelated as shown by the large number of significant interactions. Time after application and time after clipping also were important in determining the NOa-N content. A large number of applied element by time variable interactions were found significant indicating the dependence of the applied fertilizer effects upon either time after application or time after clipping.
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