Section 2
Chapter 1,197

Evaluation of soil extractants for determining Zn and Cu deficiencies in Saskatchewan soils

Edlin, V.M.; Karamanos, R.E.; Halstead, E.H.

Communications in Soil Science and Plant Analysis 14(12): 1167-1179


ISSN/ISBN: 0010-3624
DOI: 10.1080/00103628309367440
Accession: 001196915

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Four extractants, DTPA, EDTA, 1N NH4OAc and 0.1N HCl, were evaluated for their ability to predict Zn and Cu deficiencies in nine Saskatchewan soils using alfalfa as a test crop. The DTPA test was the most suitable as an index of Zn deficient soils with a critical value for Zn deficiency (giving less than 90% of maximum yield) of 1.1 mu g/g of soil. Although the results obtained for Cu were inconclusive, preference is given to the DTPA test for routine analyses.

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