Determination of suitable chemical extraction methods for the available iron content of brown forest soils in Turkey |
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| Authors: | Aydin Adiloglu |
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| Institution: | (1) T. U. Tekirdaǧ Agricultural Faculty Soil Science Department, 59030 Tekirdaǧ, Turkey |
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| Abstract: | The aim of this research was to determine the available iron (Fe) content of brown forest soils of Edirne Province and the
most suitable chemical extraction method. Eight chemical extraction methods (the 0.005 M DTPA + 0.01 M CaCl2 + 0.1 MTEA, 0.05
M HCl + 0.012 M H2SO4, 1 M NH4OAc (pH: 4.8), 0.01 M EDTA + 1 M NH4OAc, 1 M MgCl2, 0.01 M EDTA + 1 M (NH4)2CO3, 0.005 M DTPA
+ 1 M NH4HCO3, and 0.001 M EDDHA methods) and six biological indices (the dry matter yield, Fe concentration, Fe uptake, relative
dry matter yield, relative Fe concentration, and relative Fe uptake) were compared. The biological indices were determined
with barley (Hordeum vulgare L.) grown under greenhouse conditions. At the end of the experiment, the highest correlation
coefficients (r) were determined to be between the 0.005 M DTPA + 0.01 M CaCl2 + 0.1 M TEA method and the biological indices
and between the 0.005 M DTPA + 1 M NH4HCO3 method and the biological indices. The corresponding correlation coefficients (r)
for the 0.005 M DTPA + 0.01 M CaCl2 + 0.1 M TEA method and the six biological indices were 0.621**, 0.823**, 0.810** 0.433**,
0.558**, and 0.640**, respectively. For the 0.005 M DTPA + 1 M NH4HCO3 method, these coefficients were equal to 0.618**, 0.520**,
0.679**, 0.521**, 0.492**, and 0.641**, respectively (** indicate the validity of the relationships at p < 0.01) These extraction
methods, out of all the methods tested, were suggested for the determination of the available Fe content of the brown forest
soils.
Published in Russian in Pochvovedenie, 2006, No. 9, pp. 1068–1074.
The text was submitted by the author in English. |
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