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

来自 Taylor & Francis

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阅读量：

490

作者：

Mehlich，A.

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摘要：

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 CH3COOH0.25N NH4N030.015NNH4F0.013NHN030.001M 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 68% higher than those by AA and 34% 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 MehlichBowling method. High correlations between Mn, as well as Zn, extracted by M3 and M2 were shown.

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关键词：

EDTA Cu Extraction Bray 1 Ammonium Acetate Mehlich 3

DOI：

10.1080/00103628409367568

被引量：

4058

年份：

2008