Abstract
Synopsis The South African forest industry is based on intensively managed monoculture systems, and requires diagnostic tools for the development of site-related nutrient management policies. Worldwide, the evaluation of foliar nutrient concentrations is one of the most widely used techniques in forest nutrition research, with many different applications. This paper forms part of a comprehensive study of the differential nutrient supply offorest sites in the study area, as well as the effect thereof on the growth of Pinus patula. The aim of this paperis to investigate the complex interactions between site factors, absolute foliar nutrient levels and tree growth. The levels recorded in this study indicate that most elements are in adequate supply, with possible exceptions being nitrogen and calcium. A range of site factors was found to correlate significantly with foliar nutrient levels, including climatic parameters, topsoil cation levels, N mineralization rate and soil texture. The season of sampling was...
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