Distribution of zinc fractions in relation to properties of some soils of Bangladesh

Abstract

An investigation was conducted to determine the distribution and
concentrations of different forms of Zn in the soils of Gazipur. Gerua, Kalma and
Khilgaon soil series were identified in three land types, named as highland,
medium high land and medium low land, respectively. Soil samples were
collected from each soil series at three different depth such as surface (0 ‐ 15 cm),
subsurface (15 ‐ 40 cm) and substratum (40 cm+) to determine soil characteristics
and the distribution pattern of Zn fractions. Results indicated that amount of
total Zn varied significantly, ranges from 14.99 to 36.11 μg/g at different depth of
different land types. Moreover, the purpose of the sequential extraction or
fractionation was to find out the Zn in the exchangeable (Exch.), organic matter
(Org.) bound, Mn oxide (Mn‐O), amorphous Fe oxide (Am. Fe‐O), crystalline Fe
oxide (Crys. Fe‐O) and residual (Res.) fractions. In Gerua, Kalma and Khilgaon
soils, Zn concentrations predominated in Res. followed by Crys. Fe‐O and Am.
Fe‐O fractions. Results reflected that soil properties influence the distribution of
different Zn fractions in soils.