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Effect of Clipping and Nitrogen Fertilization on Yield and Stands of Tall Fescue¹

Two experiments were conducted in the field during spring and summer to study effects of nitrogen level, time of fertilization, and defoliation, and their relationships on yield and tillering and on carbohydrate and nitrogen content of the stubble.

Stand reduction by N and defoliation in ‘Kentucky 31’ fescue appears to be related to morphological stage of growth and season. Stands were reduced at high N levels in spring when grass was cut at flowering stage but not if cut frequently. Stands and regrowth during summer were reduced only slightly by high N. Soluble carbohydrates in stem bases were reduced with high N fertilization and N content was increased. Differences in chemical constituents due to treatments disappeared 20 to 30 days after regrowth.

Faster regrowth was obtained when N was applied 5 days before clipping or at time of clipping as compared with 7 days later. Fast regrowths were associated with decreases in organic reserves.

Key Words: tall fescue • nitrogen fertilization • reserve carbohydrates • tillering • fructosan

² Formerly Instructor, now Soil Scientist, Southern Forest Experiment Station, Alexandria, La.; formerly Associate Professor, now Associate Professor, Texas A & M, Rice-Pasture Research and Extension Center, Beaumont; and Professor of Agronomy.

Received for publication August 8, 1967.