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Effect of Temperature, Light, and Nitrogen on Growth and Metabolism of ‘Cohansey’ Bentgrass ( Agrotis palustris Huds.)¹

Bentgrass growth, carbohydrate reserves, and NP were influenced by temperatures. Evidently, after carbohydrates were utilized to a certain degree at high temperatures, growth was reduced below the yield of bentgrass grown at lower temperatures. Carbohydrate reserves apparently reflect the energy balance between photosynthesis and respiration and growth. This was verified by stimulated top growth but decreased carbohydrates when bentgrass was grown under warm days and cool nights.

Although bentgrass fertilized liberally with N had high photosynthetic rates, much of the stored energy was reduced and root development was less than with low N. Shade caused a reduction in photosynthesis which decreased the carbohydrate content and growth.

Data suggest that seasonal temperature must be considered in timing N fertilization for best bentgrass development.

Key Words: turfgrass • photosynthesis • respiration • carbohydrates • protein • roots • stolons

² Associate Professor and Professor of Agronomy, Virginia Polytechnic Institute.

Received for publication July 21, 1966.