Abstract
Abstract Zinc availability in 20 southern British Columbia orchard soils was examined in the greenhouse. Zinc concentration, uptake and yield in navy beans (Phaseolus vulgaris) were measured and compared with soil Zn extracted by MgCl2 at three concentrations (1.0 M, 0.50 M and 0.25 M), DTPA, 0.10 M HC1 and 0.05 M HC1 + 0.0125 M H2SO4 (Mehlich No. 1). Adding Zn at the rate of 10 mg/kg did not increase yields. Available Zn varied greatly as measured by the soil tests and by plant Zn concentration and uptake. These availability indices, except for plant Zn concentration, varied directly with Bray‐P1 extractable P and organic matter content. Plant Zn uptake and concentration and MgCl2 extractable Zn also varied inversely with pH. Zinc extracted by MgCl2 was more closely related to plant zn concentration and uptake than Zn extracted by the other three extractants. Furthermore, extraction of Zn with 0.25 M MgCl2 instead of with 1 .0 M MgCl2 decreased analytical difficulties with atomic absorption spectrophotom...
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