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This article in AJ

  1. Vol. 62 No. 4, p. 491-494
    Received: Nov 20, 1969



Nitrate Accumulation in Smooth Bromegrass (Bromus inermis, Leyss.): I. Effects of Applied N, P, and K1

  1. R. L. Vanderlip and
  2. John Pesek2



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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