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Respiration during Drying of Alfalfa Herbage¹

Respiration in harvested alfalfa (Medicago saliva L.) herbage was inactivated by tissue temperatures above 55 C for 15 minutes and by desiccation to about 60% dry matter. Microwave heating for 30 seconds caused the temperature of the tissue to exceed that needed to inactivate respiration. Relative concentration of nonstructural carbohydrates in tissue exposed to microwaves was similar to freeze-dried tissue. Microwave treatment followed by oven-drying minimized respiration losses and would, therefore, improve the quantitative data on chemical composition.

Key Words: Microwave • Alfalfa • TNC • Protein • Enzymes

² Associate Professors of Agronomy.

Received for publication May 3, 1973.

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