The effectiveness of zinc fertilizers as measured by DTPA soil extractable zinc, dry matter production and zinc uptake by subterranean clover [Trifolium subterraneum] in relation to soil properties of a range of Australian soils
1992
Brennan, R.F. (Western Australian Dept. of Agriculture, Albany. Plant Industries Div.)
In a glasshouse experiment, the initial effectiveness (IE) of zinc fertilizer as measured by dry matter production (DMP), and Zn content (uptake) of subterranean clover (clover) was found to vary markedly among the soil types. No simple linear relationship between the initial effectiveness measured by either dry matter production or uptake and any one soil property was found. IE values were found to be related to the pH (1:5 soil: water) and the level of DTPA soil extractable Zn measured in the unfertilized soil. IE based on Zn uptake by clover tops was also related to the organic carbon content of the soils. A model for IE measured by DMP in a stepwise linear regression was determined. The IE of zinc fertilizer measured by DTPA soil extraction was also found to vary markedly among soil types. The level of Zn extracted by DTPA after the addition of Zn fertilizer was found to be affected by clay, organic carbon and calcium carbonate content of the range of 54 Australian soils examined. This relationship could be described by a derived model.
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