Reaction of zinc with soil affecting its availability to subterranean clover, 1. [Trifolium subterraneum]. The relationship between critical concentrations of extractable zinc and properties of Australian soils responsive to applied zinc
1990
Brennan, R.F. (Western Australian Dept. of Agriculture, Albany. Div. of Plant Industries) | Gartrell, J.W. (Western Australian Dept. of Agriculture, South Perth. Div. of Plant Industries)
In glasshouse pot experiments using a wide range of Australian soils, the critical levels of DTPA-extractable Zn (D-Zn) determined for the maximum growth of subterranean clover were found to vary markedly with soil type from 0.13 to 0.55 microg per g. D-Zn was found to be a reliable predictor of the response of subclover to Zn added to the soils. No simple linear relationship between the critical D-Zn levels and any one soil property were found. The D-Zn critical levels were found to be related to the clay content and pH (1:5 water), and a step-wise linear regression equation was formulated. For non-responsive soils, D-Zn was found to be above the calculated critical D-Zn level.
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