Effect of soil properties on different chemical pools of zinc in calcareous soils
Prasad, R.; Sakal, R.
Journal of the Indian Society of Soil Science 36(2): 246-251
The distribution of different chemical pools of Zn in 25 calcareous soils of north Bihar [India] was studied. Water soluble, exchangeable, complexed, organically bound, occluded and residual Zn fractions constituted on an average about 0.03, 0.5, 1.9, 1.3, 1.6 and 94.6%, respectively of the total Zn content of soil. Most of the Zn fractions were correlated negatively and significantly with pH and free CaCO3 and positively and significantly with organic carbon and clay content of the soil. In general, the pH, EC, free CaCO3, active CaCO3 and HCO3- showed negative correlations with different pools of Zn in soil, whereas organic carbon, clay and Fe2O3 showed positive relationships. The significant and positive correlations amongst different pools of soil Zn point to the existence of a dynamic equilibrium among the various forms of soil Zn.