Paper tabled at IUFRO symposium and workshop on genetic improvement and productivity of fast-growing tree species, Brazil, August 1980

Seasonal Changes in Foliar Nutrient Content of E. grandis

Published in: South African Forestry Journal
Volume 119, issue 1, 1981 , pages: 1–4
DOI: 10.1080/00382167.1981.9630215
Author(s): A., P.G. Schönau,

Abstract

The monthly variations in the concentrations of six macro- and four micro-nutrients in the foliage of Eucalyptus grandis were studied at three different sites for a period of two years, when the trees were between one and three years of age. There was a close relationship between rate of height growth and rainfall during this period. The changes in foliar levels of N, P, K, Ca, Mg, S and Zn conformed very closely to the rate of height growth. For Fe this relationship was inverse. It was only just apparent for Cu and Mn, and the seasonal variation of the last nutrient was minimal. The foliar levels of N, Ca, S, Cu, Zn and Fe were also related to rainfall, the last nutrient again showing an inverse relationship. There was a distinct decline in the foliar levels of N, P, S and Cu during the two years of observation. It seems advisable that routine sampling of E. grandis leaves should be carried out during the height of the growing season of the first year after planting when responses are greatest and differences more pronounced.

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