Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 July 1970
Published in Agron J 62:442-444 (1970)
© 1970 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Time and Rate of N Applications on Yield, Nutritive Value Index, Crude Protein, and Nitrate Content of Bromegrass1

W. K. Look Kin and A. F. MacKenzie2

The influence of pre-winter, spring, summer, and fall applications of N on yield and quality of bromegrass was studied over a 12-month period on two Quebec soils. N applications increased the yield of dry matter, digestible energy (Yield-NVI), and crude protein significantly (5%) for each increment of 112 kg N/ha. There was no significant difference among pre-winter, spring, and summer applications of N. Mitscherlich and multiple regression equations indicated that dry matter yield of bromegrass could be increased by rates of N above 336 kg/ha.

N applied prior to any growth period did not affect the NVI of bromegrass but the crude protein and NO3 contents were significantly increased in the resulting harvested material.

N-fertilized bromegrass at the 336 kg/ha level gave comparable yields of dry matter and digestible energy to alfalfa-brome pastures.

Key Words: Fertilizer • Residual effects

1 Contribution from the Department of Soil Science, Macdonald College, McGill University, Quebec. Financial support from the Quebec Agricultural Research Council is acknowledged. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the M.Sc. degree at McGill University.

2 Former Graduate Student and Associate Professor of Soil Science.

Received for publication February 17, 1969.


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J. L. Riesterer, M. D. Casler, D. J. Undersander, and D. K. Combs
Seasonal Yield Distribution of Cool-Season Grasses following Winter Defoliation
Agron. J., September 1, 2000; 92(5): 974 - 980.
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Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
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Environmental Quality		 The Plant Genome
Copyright © 1970 by the American Society of Agronomy.