Solubility and Availability of Micronutrients in Relation to Phosphorus Fertilization
1960
Bingham, F. T. (Frank T.) | Garber, M. J.
Availability of B, Cu, Fe, Mn, Mo, and Zn in relation to excesses of Ca(H₂PO₄)₂ was studied with sour orange seedlings as indicators for induced interactions created in 19 different soils. To separate the effect of the carrier from that due to phosphorus, Ca(H₂PO₄)₂, H₃PO₄, KH₂PO₄, and NH₄H₂PO₄ sources were also used in a separate experiment. Chemical analyses of water extracts from the latter experiment provided the solubility data as controlled by excesses of P. Regardless of sources, excess P resulted in acute Cu deficiency; and in the case of acid soils, reduced uptake of B and Zn usually followed excess P fertilization. Excessive P fertilization of acid soils resulted in increased Mn and Mo uptake, whereas in alkaline soils excessive P reduced the availability of Mo. Solubility of Mn, B, and Mo Paralleled uptake data. Cu and Zn Solubilities were increased by excessive P fertilization. Mechanisms pertinent to the various P interactions are discussed with the major emphasis placed on P-Cu antagonism.
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