Solubility and Availability of Micronutrients in Relation to Phosphorus Fertilization1
- Frank T. Bingham and
- M. J. Garber2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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