The solution of a multivariate regression function for the yield estimation of Eragrostis curvula in Natal is presented in nomographic and cartographic form. The yield expression which is a complex function of, inter alia, mean annual precipitation, major soil group rating, age and nitrogen application, the latter interacting with soil depth, degree of leaching and texture, is modified to facilitate its nomographic solution. For the cartographic presentation use is made of a data file consisting of point rainfall data and soils information for 1 002 points distributed in a 10 km square grid over Natal. The map illustrates the marked regional differences in estimated yield of Eragrostis curvula in Natal.
Journal articles from the Grassland Society of Southern Africa (GSSA) African Journal of Range and Forage Science as well as related articles and reports from throughout the southern African region.