Study of relationship between zinc fractions and selected soil properties of rice soils

The present study was investigated that Zn fractions and their relationship with soil properties of paddy soils of Coimbatore district, Tamil Nadu. Totally ten Soil samples were collected from Anaimalai and Thondamuthur blocks of Coimbatore district. The results showed that more than 80 per cent of total Zn occurred in residual fraction, while smaller fraction occurred as water soluble plus exchangeable (1.7 %), organically complexed (4.0 %), Fe oxide bound (8.0 %) and Mn oxide (14.5 %) forms. The relative Zn fractions for all the soil samples decreased in the following order: Res > MnOx> AFeOx>Org>WE-Zn. All these four Zn fractions showed no significant and negative correlation with any fractions, except Org. The between organically bound Zn fraction, organic carbon (0.36**) and available Fe (0.56**) was found to be significant and positive. The FeOx bound fraction positively correlated with organic carbon (0.09) and electrical conductivity (0.10**). The MnOx bound fraction was negatively correlated with organic carbon, available Zn and Mn and it was also significant. The residual fractions of zinc was negatively correlated with all soil properties.