Summary
Assuming that their efficiency might possibly be improved by natural complex formation, inorganic Zn salts were mixed into organic manures before decomposition. These mixtures were allowed to decompose aerobically and anaerobically, to produce Zn-enriched manures and slurries, for 75 and 50 days, respectively. Fractionation of Zn in the final product revealed that the water-solubility of ZnSO4 decreased and that of ZnO increased on mixing the compounds with organic matter. Most of the added Zn remained in exchangeable form and the amount of chelated Zn increased with the time of decomposition. Plant availability of Zn from Zn-enriched manure was less and from Zn-enriched slurry was more than that of equal amounts of ZnSO4. Available soil Zn was also higher in soils treated with Zn-enriched slurry than with any other material.
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Singhania, R.A., Rietz, E., Söchtig, H. et al. Chemical transformation and plant availability of zinc salts added to organic manure. Plant Soil 73, 337–344 (1983). https://doi.org/10.1007/BF02184310
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DOI: https://doi.org/10.1007/BF02184310