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Early Growth of Crownvetch under Reduced Light¹

In 1963 and 1964, three varieties of crownvetch were subjected to six levels of shading (31% to 100% full daylight) to evaluate responses of this species to reduced light under field conditions. In neither year did shading significantly alter percentage total available carbohydrates in the roots but root weight was greatly reduced. Absolute carbohydrate levels varied significantly between years and varietal differences were significant. Under shaded conditions root growth was affected to a greater extent than top growth. Percentage crude protein in the forage increased as shading increased.

Key Words: Coronilla varia L. • Shade • Seedling growth • Root growth • Top growth • Carbohydrates • Protein • Penngift • Chemung • Emerald

² Approved for publication as paper number 3694 in the journal series of the Pennsylvania Agricultural Experiment Station.

Received for publication November 28, 1969.