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THE EFFECTS OF LEAF POSITION AND LEAF AGE IN FOLIAR ANALYSIS OF GMELINA ARBOREA

JULIAN EVANS
Plant and Soil
Vol. 52, No. 4 (SEPTEMBER 1979), pp. 547-552
Published by: Springer
Stable URL: http://www.jstor.org/stable/42933728
Page Count: 6
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THE EFFECTS OF LEAF POSITION AND LEAF AGE IN FOLIAR ANALYSIS OF GMELINA ARBOREA
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Abstract

Analysis of macro- and micronutrient content of leaves of Gmelina arborea, a deciduous tree widely planted in the lowland tropics, was undertaken to determine the effects of leaf position within the crown and leaf age in relation to time of flushing on foliar nutrient levels. Within the crown, foliar nitrogen, phosphorus, zinc, and boron levels decreased, and calcium and iron levels increased, with increasing amount of leaf shading. Evidence of a genuine trend of declining nitrogen and potassium levels with increasing leaf 'age' is presented, the fact of which will greatly complicate sampling procedures.

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