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2. D. E. Baker, and M. C. Amacher .1982. Nickel, copper, zinc, and cadmium. In A. L. Page (ed.), Methods of Soil Analysis (Monograph 9), Part 2, 2nd edn .American Society of Agronomy,Madison, WI, pp.323 -336 .
3. Aluminum Effects on Growth, Mineral Uptake, and Efficiency Ratios in Red Clover Cultivars
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4. NUTRIENT USE EFFICIENCY IN PLANTS