A Method of Measuring Vigor of Range Grasses

Effect of Time of Cutting on Yield and Botanical Composition of Prairie Hay in Southeastern Nebraska

“…The dry weight of tops from the clipped plants varied from 13.1 to 47.5 per cent of the dry weight of tops from th e unclipped controls. This type of study has been repeated man y times with similar results Weaver and Darland, 1947).…”

Effect of Range Condition on Plant Vigor, Production, and Nutritive Value of Forage

“…Principal objections to the use of vigor are: (A) vigor may be modified by the effects of current weather, (B) a perennial on depleted ranges may exhibit more vigor after a short omission of grazing than the same species in climax, and (C) vigor is hard to measure or describe (Dyksterhuis 1949, Humphrey 1949, Parker 1954. Other investigators regard change of vigor as one of the important indicators of change in range condition since it is frequently the first response to a change in management ( J o h n s o n 1956, Pechanec 1945, Short and Woolfolk 1956, Weaver and Darland 1947.…”

Establishment of prairie species in Iowa by seeding and transplanting

“…A method for measuring vigor of range grasses was developed by Weaver and Darland (1947) using sods transplanted into deep soil boxes.…”