Zinc Availability for Corn as Related to Source and Concentration in Macronutrient Carriers1

摘要: Zinc oxide, ZnSO₄, and ZnS were tested as sources of Zn at rates 1, 2, 4 ppm for two successive crops corn (Zea mays) grown on Nolichucky sandy clay loam (pH 7.3). Each source was mixed throughout the soil finely ground material, incorporated into granules ammonium nitrate (AN) or polyphosphate (APP) by pressure granulation, concentrated superphosphate (CSP) during granulation stage manufacturing process. When with ZnO ZnSO₄ more effective than when a macronutrient carrier. Both markedly superior to ZnS. Ammonium APP comparable carriers source, but AN used. A higher concentration in CSP resulted poorer response this oxide granulated CSP, AN, APP, contain 0.5, 2.0, 8.0% Zn. Soil applied while 2 only. Forage yields uptake varied inversely all carriers.