Mehlich-3 soil test extractant: A modification of Mehlich-2 extractant

Mehlich, A. (1984) Mehlich-3 soil test extractant: A modification of Mehlich-2 extractant. Communications in Soil Science and Plant Analysis, 15 (12). pp. 1409-1416.

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The objectives of this study were to modify the Mehlich 2 (M2) extractant to include Cu among the extractable nutrients, retain or enhance the wide range of soils for which it is suitable and minimize it's corrosive properties. The substitution of nitrate for chloride anions and the addition of EDTA accomplished those objectives. The new extracting solution, already designated Mehlich 3 (M3) is composed of 0.2N CH3COOH‐0.25N NH4N03‐0.015NNH4F‐0.013NHN03‐0.001M EDTA. Extractions from 105 soils using M3, M2, Bray 1 (Bl) and Ammonium Acetate (AA) were compared to evaluate the new extractant. The quantity of F extracted by M3 exceeded that by M2 20% and that by Bl 4% but the results from all extractions were highly correlated. Extractions of both K and Mg by M3 were 6–8% higher than those by AA and 3–4% higher than those by M2, but, again, there was high correlation among methods. Addition of EDTA increased Cu extractions by 170%, Mn by 50% and Zn by 25%. Cu extractions by M3 correlated with those from the Mehlich‐Bowling method. High correlations between Mn, as well as Zn, extracted by M3 and M2 were shown

Item Type: Article
Uncontrolled Keywords: EDTA, Cu Extraction, Bray 1, Ammonium Acetate, Mehlich 3
Author Affiliation: Agronomic Division North Carolina Department of Agriculture , Raleigh, North Carolina, 27611
Subjects: Social Sciences
Divisions: General
Depositing User: Ms K Syamalamba
Date Deposited: 05 Aug 2014 09:58
Last Modified: 05 Aug 2014 09:58
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