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Influences of Several Management Practices on Growth Characteristics and Available Carbohydrate Content of Smooth Bromegrass¹

Herbage yields of bromegrass (Bromus inermis Leyss.) grown without alfalfa were favored by infrequent cutting (3 cuts) primarily because spring growth yields were increased. Nitrogen fertilizer (168 kg/ha) increased bromegrass yields by increasing the number of tillers and rapidity of regrowth after cutthag. Herbage yields of bromegrass plants grown with alfalfa were favored by frequent cutting (5 cuts) because fewer shoot apices were removed by frequent cutting and because alfalfa was less competitive.

Frequent cutting decreased slightly the percentage of total available carbohydrates (TAC) accumulated between cuttings in the stem bases of bromegrass. Nitrogen fertilizer increased depletion of TAC after cutting, but did not affect the maximum level accumulated. Association with alfalfa decreased markedly the percentage of TAC in bromegrass during the growing season. High levels of TAC were present under all the treatments when growth ceased during late autumn.

Key Words: cutting frequency • nitrogen fertilization • association with alfalfa

² Formerly Research Assistant; (now Associate Professor of Agronomy, Kansas Agr. Exp. Station, Manhattan 66504) and Professor, Department of Agronomy, University of Wisconsin, Madison, 53706.

Received for publication December 16, 1967.

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