The effects of pH and calcium on the growth ofLeucaena leucocephala in an oxisol and ultisol soil |
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Authors: | G J Blair K B Lithgow P W Orchard |
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Institution: | (1) Department of Agronomy and Soil Science, University of New England, 2351 Armidale, Australia |
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Abstract: | Leucaena was grown for eleven weeks in a pH and calcium amended oxisol and ultisol to determine whether poor growth in acid
soils is related to calcium deficiency or low pH induced effects, such as aluminium toxicity. Soil pH was ameliorated by the
addition of either CaCO3, or SrCO3, while CaCO3 or Ca(NO3)2 were used to modify calcium supply. In both soils, CaCO3, and SrCO3 application resulted in an increase in pH and a reduction in exchangeable aluminium although the response of leucaena to
the applied amendment varied between the two soils. In the oxisol there was little effect of increased pH on growth, but a
marked response to Ca application. In the ultisol, growth was improved by increasing pH but there was no response to increased
calcium. The effects of liming on these soils are discussed in relation to alternative strategies available for utilising
leucaena and other tree legumes. |
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Keywords: | calcium carbonate calcium supply exchangeable cations leucaena liming oxisol pH root growth shoot growth strontium carbonate ultisol |
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