Abstract
Organic matter is the major source of zinc in soil. The availability of this nutrient is dependent on the release from organic matter through mineralization and reaction with soil particles. Addition of bioslurry, containing 70 mg Zn kg−1 will influence availability of Zn through its effect on transformation reaction in soil. The present study was conducted to determine the distribution of major chemical forms of Zn in an alluvial soil, to understand the changes in zinc fractions due to bioslurry application and cropping and to find out the inter-relationships and equilibria between the fractions. Soil solution + exchangeable Zn (Zn-CA), specifically sorbed Zn by inorganic sites (Zn-ACC), specifically sorbed Zn by organic sites (Zn-PYR), Zn occluded by free oxides (Zn-OX), and residual zinc (Zn-RES) constituted 0.3, 4.5, 16.6, 16.3 and 57.3 percent, respectively of the total Zn content (Zn-TOT). Application of 13.32 t ha−1 bioslurry increased Zn content in Zn-CA, Zn-PYR and Zn-RES by 72.7, 93.2 and 36.4 percent, respectively over control. Zn occluded by free oxides (Zn-OX) was found released by the dissolution action of organic compounds present in bioslurry and the amount of Zn so released was transformed to Zn-RES, Zn-CA and Zn-DTPA. Growing crops increased Zn content in Zn-RES fraction only. Linear positive relationships between Zn-CA, Zn-PYR, Zn-RES and DTPA-Zn and bioslurry levels marked the significance of bioslurry in stabilising the status of these fractions. Path coefficient analysis and intercorrelation studies indicated the existence of equilibrium between different Zn fractions in soils.
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Sharma, K.L., Bajaj, J.C., Das, S.K. et al. Nutrient transformation in soil due to addition of organic manure and growing crops. Fertilizer Research 32, 313–319 (1992). https://doi.org/10.1007/BF01050368
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DOI: https://doi.org/10.1007/BF01050368