Assessment of chemical methods for extracting zinc, manganese, copper, and iron from New South Wales soils
Titel:
Assessment of chemical methods for extracting zinc, manganese, copper, and iron from New South Wales soils
Auteur:
Haddad, K. S. Evans, J. C.
Verschenen in:
Communications in soil science and plant analysis
Paginering:
Jaargang 24 (1993) nr. 1-2 pagina's 29-44
Jaar:
1993-01
Inhoud:
A glasshouse study, using subterranean clover (Trifolium subterraneum cv Woogenellup) as the test crop and 60 soils collected from different soil types and areas of NSW, was conducted to assess eight chemical extractants as predicators of soil zinc (Zn), manganese (Mn), copper (Cu), and iron (Fe) availablity to clover plants. This was achieved by correlating the concentration and uptake of these micronutruients by the clover against the soil concentration extracted by the various reagents. In addition, the influence of other soil properties on each of the resulting relationships was studied by using a step-wise multiple regression analysis. Extractants with regressions (models) of the highest accuracy and smallest relative residuals were selected as the most suitable ones. For the selected extractants, the R2 values of their models and the soil ranges of micronutrients over which the models are applicable for the first harvest of the whole tops of the clover plants were: 0.05M HCl for acidic to near neutral soils for Zn (R2 = 0.80 for concentration and 0.78 for uptake and the range is 0.06-3.2 mg/kg); DTPA for calcareous soils for Zn (R2=0.80 for concentration and uptake and the range is 0.18-4.08 mg/kg); 0.01M CaCl2 for Mn (R2 = 0.71 for concentration and 0.64 for uptake and the range is 0.0-41 mg/kg;) and 0.31M HNO3 for Cu uptake (R2 = 0.72 and the range is 1.5-16.7 mg/kg). None of the extractants gave useful relationships with the concentration of Cu or Fe, or the uptake of Fe by the clover.
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