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Effect of Harvest Management and Temperature on Forage Yield, Root Carbohydrates, Plant Density and Leaf Area Relationships in Alfalfa (Medicago sativa L. cultivar 'Moapa')¹

Stage of growth at harvest had a greater influence on forage production and plant density of alfalfa (Medicago sativa L.) than stubble height remaining after harvest when plants were grown under field conditions at Tucson, Arizona. Decline in forage yield and plant population was greatest during the period when night temperatures were highest. The percentages of A-HC (acid-hydrolyzable carbohydrates) in roots of alfalfa plants harvested at the 50% bud stage of growth declined to a lower level and remained less than when harvested at the 25% bloom stage. Generally, LAI (leaf area index) for plants harvested at the 25% bloom stage was higher than when harvested at the 50% bud stage. Plant density declined greatest during the second year and when plants were harvested at the 50% bud stage of growth.

Key Words: leaf area index • stubble height • acid-hydrolyzable carbohydrates

² Formerly Research Assistant (now Associate Agronomist and Superintendent of Southern Nevada Field Laboratory, Logandale, Nevada 89021) and Professor and Head, Department of Agronomy, University of Arizona, Tucson, Ariz.

Received for publication May 29, 1967.