A common chemical extractant for estimating plant-available zinc in different soil types (peaty, red and alluvial)

Relative efficiency of five chemical extractants for the extraction of available Zn in four different soils and its uptake by rice seedlings was studied in a pot culture experiment. The Zn extracted by dithizone-ammonium acetate showed a significant relationship with plant uptake whereas the values for other extractants except NH4OAc (pH4.8) did not approach the level of significance. Among the soil properties studied, pH and CaCO3 correlated negatively and organic matter and CEC positively with Zn uptake by rice plants.