Original Articles

Nomographic and cartographic estimation of eragrostis curvula yields in natal

DOI: 10.1080/00725560.1983.9649000
Author(s): R.E. SchulzeAgricultural Catchments Research Unit, Department of Agricultural Engingeering,, M.C. DentAgricultural Catchments Research Unit, Department of Agricultural Engingeering,

Abstract

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.

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