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The effect of soil reaction on nickel and zinc availability to red clover has been determined through an analysis of 223 samples of soil and red clover collected in all communes of Cracow province. The content of total nickel in topsoil ranges from 2.8 to 50.0 mg/kg with a geometric mean concentration 15.2 mg/kg. The values for zinc are respectively 48.8-600 mg and 87.5 mg/kg. The amounts of metals...
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