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A laboratory test for screening iron chelates for use in alkaline soils

P.I. ORPHANOS and C. HADJILOUCAS
Plant and Soil
Vol. 77, No. 2/3 (1984), pp. 401-404
Published by: Springer
Stable URL: http://www.jstor.org/stable/42934548
Page Count: 4
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A laboratory test for screening iron chelates for use in alkaline soils
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Abstract

A soil incubation test is described for screening Fe-chelates for use under alkaline conditions. Ten grams of air-dry soil were mixed with 4 ml of an aqueous solution containing the appropriate amount of iron of the test chelate adding to the soil 24 ppm of iron (soil air-dry weight basis). The moistened soil was incubated in stoppered plastic vials at 24°C. On day 4 from the start of incubation, and at weekly intervals thereafter, the contents of triplicate vials were extracted with. 16 ml of DTPA solution prepared according to the method of Lindsay and Norvell. The Fe extracted in this way was considered to be a measure of the stability of the chelates tested in comparison to Sequestrene 138.

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