Abstract
The effects of amending an acid Andisol with lime and gypsum on soil pH, aluminum (Al) saturation, the plant-availability of sulfur (S) and phosphorus (P), and the growth, botanical, and chemical composition of a ryegrass/white clover pasture were measured in a field trial in southern Chile. The combined amendment of limestone, dolomite and gypsum raised soil pH slightly, decreased Al saturation from 20 to less than 1% and increased the concentration of plant available P, S, calcium (Ca), magnesium (Mg), and potassium (K) in the soil. The growth of a recently-sown rye grass–white clover pasture increased by 50% and the proportions of ryegrass, white clover and weed species changed from 12.6, 0.2, and 87% to 75, 7.7, and 17%, respectively. Plant chemical analysis suggested that, while N, P, and S concentrations in mixed pasture were less than critical values in spring, S was the most limiting nutrient in pastures from both the amended and control areas.
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