Graduate Thesis Or Dissertation
 

The effect of defoliation and nitrogen application on the seed yield of Linn perennial ryegrass (Lolium perenne L) and Merion Kentucky bluegrass (Poa pratensis L)

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  • The effect of clipping and supplemental nitrogen application on seed production of Linn perennial ryegrass and Merion Kentucky bluegrass was studied. Clipping and nitrogen treatments did not significantly affect the seed yield of Linn perennial ryegrass during the 1967 growing season. The seed yield of Merion Kentucky bluegrass was significantly increased by a combined winter-spring clipping regime when compared with the unclipped control. Application of 136 pounds of nitrogen in two equal spring applications significantly reduced the seed yield of Merion Kentucky bluegrass. Spring clipping tended to reduce the number of fertile tillers per unit area for both species. Supplemental nitrogen generally increased the number of fertile tillers per unit area for Linn perennial ryegrass. Application of 30 pounds of additional nitrogen delayed the period of head emergence for Linn perennial ryegrass. The time of pollen shed of Merion Kentucky bluegrass was delayed by all clipping regimes.
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