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Effects of Clipping on Red Clover Seed Yields and Seed-Yield Components¹

The effects of clipping on seed yields and seed-yield components of four red clover varieties were determined from 1962 to I965 on 2nd- and 3rd-year stands. The varieties ‘Altaswede,’ ‘Dollard,’ ‘Kenland,’ and ‘Pennscott’ were selected to provide a range of types froln single-cut to double-cut. Unclipped plots and plots clipped on May 1 produced higher seed yields than plots clipped on May 21 and June 11. Reduction in seed yields, percent flowering, and number of heads were greater for Altaswede and Dollard than the other two varieties with the progressively later dates of clipping. Slower recovery of single-cut types, and reduced seed yields from the faster recovering early types within Dollard, were suggested as the reasons for the differential effect of clipping on these varieties. Heads in full bloom on July 5, July 19, and August 2 were selected for collection at maturity. The number of florets per head, seeds per head, and seed weight were significantly lower for the later dates of sampling. An increase in the number of maturing seeds on the plant may have reduced these components.

² Research Agronomist, Crops Research Division, ARS, USDA, Irrigated Agriculture Research and Extension Center, Prosser, Washington.

Received for publication February 25, 1966.

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