Nutrient uptake of soybean genotypes under aluminum toxicity
Heru Kuswantoro
The objective of this research was to study the nutrient uptake of soybean exposed to aluminium (Al) toxicity. The factorial design consisted of two treatments arranged in a randomized block design with three replications. Liming was the first factor which consisted of four levels, i.e. i) without liming; ii) liming with 0.5×Al(exchangeable/ec); iii) liming with 1×Al(ec); and iv) liming with 1.5×Al(ec). Five genotypes were used as second factor, i.e. three tolerant genotypes (W3898- 14-3, Wilis, and Kawi), and two sensitve genotypes (MLG 3209 and MLG 3083). It was found that two tolerant genotypes, W3898-14-3 and Kawi, had a higher potassium (K) and sodium (Na) uptake than susceptible genotypes. Liming affected significantly the ratio of Al/[calcium (Ca) + magnesium (Mg)] in roots and leaves, the content of Ca and Mg in the roots and the content of Mg in the leaves. The K content in the roots and the content of Ca, K, and Na in the leaves were unresponsive to the alteration of pH and Al saturation.
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