Evaluation of laboratory indices of magnesium availability
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Date
1995
Journal Title
Journal ISSN
Volume Title
Publisher
Kerala Agricultural University
Abstract
A study was conducted to evolve a suitable extractant of available Mg in soil. Twenty soils were
selected for the study assuring wide variation in their properties in relation to Mg availability. The various
extractants in the final screening showed the following decreasing order in their efficiency for extracting Mg;
0.005 M DTPA + 0.005 M CaCI2 .Mathew's triacid > 0.1 M acetic acid + 0.04 M Ca lactate > Keith's reagent
> 0.0125 M CaCI,, 1 N NH4OAc > 0.05 M HCI > 0.005 M DTPA. The amount of Mg extracted by various
extractants failed to correlate significantly with the Mg uptake of test crop (rice) as well as the per cent of
Mg in the crop. The performance of 0.05 M HCI was promising with respect to the pattern of release, degree
of variability due to varying periods of equilibration ami the magnitude of Mg extracted at the optimum
period of equilibration.
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Citation
Journal of Tropical Agriculture, 33(1), 36-39.