A Field Test of the Relative-Weight-Estimate Method for Determining Herbage Production

Abstract

Reliable estimates of total herbage yield can be made by the relative-weight-estimate method. The method is based on the concept that it is easier and more accurate to estimate herbage yield as a percent of yield from a base plot than it is to estimate yields directly in grams or pounds. Estimates of total herbage are reasonably accurate, but they are less accurate for vegetation classes of grasses, forbs, and shrubs and for individual species. This method generally contains an inherent bias that cannot be detected unless a double-sampling procedure is used to check and correct field estimates.