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Influence of Planting Rates and Mowing on Yield and Quality of Crimson Clover Seed¹

In a 3-year experiment we studied the effects of difterent planting rates and of early spring mowing on yields and quality of crimson clover seed. High planting rates generally hastened plant development and maturity. In non-mowed stands, the 5.6 and 9 kg/ha planting rates resulted, in the best seed yields. Mowing generally increased seed yields, germination, and hard seeds, and it decreased 1,000-seed weight as compared with non-mowing. Planting at 13.4 kg/ha plus mowing resulted in the most seed. ]Low planting rates may favor seed production because flowering and maturity are later. Effects of mowing conducive to high seed yields are: decreased lodging; delayed flowering and seed maturity until favorable pollinating and harvesting conditions prevail; and reduced bulk of plant material for threshing.

Key Words: Trifolium incarnatum L. • seeding rate • germination • hard seeds • weight of 1,000 seeds

² Research Agronomist, Crops Research Division, ARS, USDA, Corvallis, Ore. 97331.

Received for publication May 29, 1968.

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