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Studies of the distribution and bioavailability of soil zinc fractions
Author(s) -
Banjoko Victor A,
McGrath Stephen P
Publication year - 1991
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740570304
Subject(s) - zinc , chemistry , bioavailability , extraction (chemistry) , soil water , environmental chemistry , adsorption , nuclear chemistry , chromatography , organic chemistry , bioinformatics , environmental science , soil science , biology
This investigation was undertaken to study the distribution and availability of Zn in different soil fractions. The proportions of total Zn present in the soils in exchangeable, organically bound, complexed or adsorbed and residual fractions were determined by sequential extraction with CaCl 2 , H 2 O 2 , EDTA and HCl/HNO 3 , respectively. Most of the total Zn was, on average, present in the EDTA‐Zn (15.5%) and HCl/HNO 3 ‐Zn (78%) forms. The CaCl 2 ‐Zn and H 2 O 2 ‐Zn fractions averaged 5.0 and 1.5% of the total Zn respectively. Zinc present in exchangeable (CaCl 2 ‐Zn), organically bound (H 2 O 2 ‐Zn) and complexed (EDTA‐Zn) forms was closely related to the bioavailability of Zn to maize plants grown on these soils. The residual Zn (HCl/HNO 3 ‐Zn) was not readily available.