Reaction products and solubility of applied zinc compounds in some manitoba soils
1978
KALBASI, M. | RACZ, G. J. | LEWEN-RUDGERS, L. A.
ZnSO4, Zn EDTA, ZnS, and ZnSO4 plus NH4H2PO4 were banded in soils, and the solid-phase zinc compounds were identified using x-ray diffraction analysis. Solubility of zinc in soil adjacent to the fertilizer band was determined by measuring the zinc concentration in soil-water extracts.The reaction product in a noncalcareous soil (pH 8.2) treated with ZnSO4 was Zn(OH)2, which was metastable and persisted for only a few weeks. ZnSO4 was usually precipitated as ZnCO3 and Zn5(CO3)2(OH)6 in the calcareous soils. No crystalline reaction products were detected in soils treated with Zn EDTA. ZnS was usually identified in soils treated with ZnS. In addition, Zn5(CO3)2(OH)6 and Ca[Zn(OH)3]2$2H2O were found in a calcareous soil treated with ZnS and incubated for 32 weeks. Reaction products formed when ZnSO4 plus NH4H2PO4 was added in a band were Zn3(PO4)2$4H2O in the noncalcareous Newdale soil and Zn3(PO4)2$4H2O, NH4ZnPO4, and ZnCo3 in the calcareous Lakeland soil.Concentrations of zinc in water extracts of soils treated with zinc were greater than in untreated soils. Zinc concentration in water extracts of soils was greatest with Zn EDTA and lowest with ZnS. Zinc concentration in water extracts of calcareous soils was less than in noncalcareous soils treated with ZnSO4. Zn EDTA was highly soluble in all soils. Zinc concentration decreased with time of incubation in soils treated with ZnSO4 or Zn EDTA, but zinc concentration of water extracts increased with time in soils treated with ZnS. Zinc concentration in water extracts of soils treated with phosphate plus ZnSO4 was less than for soils treated only with ZnSO4.
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