TY  - JOUR
T1  - Evaluation of Three Sequential Extraction Methods for Fractionation of Zinc in Calcareous and Acidic Soils
AU - Saffari, Mahboub AU - Yasrebi, Jafar AU - Karimian, Najafali AU - Shan, Xiao-Quan 
JO  - Research Journal of Biological Sciences
VL  - 4
IS  - 7
SP  - 848
EP  - 857
PY  - 2009
DA  - 2001/08/19
SN  - 1815-8846
DO  - rjbsci.2009.848.857
UR  - https://makhillpublications.co/view-article.php?doi=rjbsci.2009.848.857
KW  - Sequential extraction
KW  -fractionation
KW  -calcareous
KW  -acidic soils
KW  -zinc
AB  - Zinc (Zn) is essential micronutrient for crop growth. Deficiency of zinc has been frequently detected sin soils in Iran. Generally, available form of Zn can be rapidly converted to unavailable form in calcareous soils. The objective of this study was to evaluate three methods for fractionation of Zn in nine surface (0-30 cm) calcareous and acidic soils of Fars, Kerman and Gilan provinces, Iran. The results showed that a major proportion of Zn was present in the residual and carbonate-bound fractions. Zn distribution pattern obtained by Sposito method follow the order residual>>carbonate-bound>organic-bound>exchangeable>adsorbed fractions. For Singh’s method, the order was residual>>carbonate-bound>Fe crystalline oxides-bound>Fe amorphous oxides-bound>organic-bound>Mn oxides-bound>exchangeable. For Ma and Uren method the order was residual>>carbonate-bound>Fe-Al oxides-bound>Mn oxides-bound>organic-bound>adsorbed>water soluble. Correlation analysis between soil properties and the Zn fractions showed that Zn fraction distribution pattern depends on soil pH, CCE, OM, CEC and texture.
ER  -