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Published in Agron J 62:491-494 (1970)
© 1970 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Nitrate Accumulation in Smooth Bromegrass (Bromus inermis, Leyss.): I. Effects of Applied N, P, and K1

R. L. Vanderlip and 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.

Key Words: Nutrient interaction • Growth stage • Clipping

1 Journal Paper No. J-6398 of the Iowa Agricultural and Home Economics Experiment Station, Ames, Iowa. Agronomy Department, Project 1530.

2 Former Research Associate and Professor of Agronomy. The senior author is now Associate Professor of Agronomy at Kansas State University, Manhattan, 66502.

Received for publication November 20, 1969.




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