4.1 Research Objectives4.1.1 Research Objective 1The erosion-productivity model; Soil Changes Under Agriculture, Agroforestry and Forestry (SCUAF) version 4.0 (Young et al. 1998) was employed to estimate the soil loss due to erosion associated with each land use system. Annual estimates of soil loss due to erosion provided by SCUAF allowed the testing of research hypothesis number 1, using a t-test.SCUAF is a simple, deterministic model, designed to predict the effects of interactions between AF systems and soil. The model predicts the changes in soil fertility, crop yield, and tree biomass over time by simulating the breakdown rate of plant material and the soil nutrient uptake by plants. It can be used to compare AF systems with those under agriculture or forestry; thus, its name. While it does not directly include an economic component, SCUAF can be used as a basis for economic analysis by providing input and output values (Young et al. 1998).
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