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Seasonal Pattern of Fructosan in Orchardgrass Stubble as Influenced by Nitrogen and Harvest Management¹

Synopsis: Soluble carbohydrate in orchardgrass, as indicated by fructosan, decreased rapidly during the period of maximum vegetative development—maximum stem elongation and seed head development—indicating that this was a critical period for management. In each of 4 cuttings, fructosan was reduced by increments of N. Large N applications render orchardgrass susceptible to injury, but the combination of high temperature and low soil moisture cause it.

² Head of Department, Research Professor, Technical Assistant, and Visiting Polish Research Fellow, Department of Agronomy, University of Massachusetts, Amherst.

Received for publication July 27, 1964.