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Influence of Light Intensity, Temperature and Growing Period on the Growth, Chemical Composition and Digestibility of Culver and Tanverde Alfalfa Seedlings¹

Synopsis: Dry matter accumulation and cellulose content of two alfalfa varieties increased with advancing maturity and increasing light intensity while crude protein and in vitro digestibility decreased. Soluble carbohydrates were greatest under high light intensity with alternating day and night temperatures of 30° C. and 15° C., respectively. Dry matter accumulation was greatest under high temperature and high light intensity, but digestibility was lower as temperature increased.

² Formerly Graduate Assistant in Agronomy, Rockefeller Foundation Research Fellow; Research Agronomist, Crops Research Division, ARS, USDA, and Assistant Professor of Agronomy; Professor of Agronomy; and Associate Professor of Agronomy, respectively.

Received for publication December 24, 1964.

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