pasture production

Pastures, Pests and Productivity—Simple Grazing Models with 2 Herbivores

Simple grazing models with two herbivores are used to assess the effects of pasture pests on stability and productivity of continously-growing pastures. Algebraic and graphical methods are also presented for estimating losses from pasture pests at different stocking rates directly, from data on productivity/stocking rate relationships. Pests are considered as competing grazing herbivores and denuders of pasture area. Denuding pests have no effect on stability but grazing pests increase the likelihood of discontinuous stability.