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The objective of this experiment was to evaluate the effects of different doses of sludge on fruit yield, growth, nutrition and heavy metal accumulation of apple trees on a calcareous soil 1999-2003. Sewage sludge was added to the soil at rates of 0, 10, 20, 40 and 60 kg tree-1. Manure was applied to the soil at a rate of 25 kg tree⁻¹. According to four-years data, cumulative application of sewage...
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