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Published in Soil Sci Soc Am J 24:209-213 (1960)
© 1960 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Solubility and Availability of Micronutrients in Relation to Phosphorus Fertilization1

Frank T. Bingham and M. J. Garber2

ABSTRACT

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.

NOTES

1 Paper No. 1188, University of California Citrus Exp. Sta., Riverside. Presented before Div. IV, Soil Science Society of America, Cincinnati, Ohio, Nov. 16, 1959.

2 Associate Chemist, Department of Soils and Plant Nutrition; and Assistant Biometrician, Biometrical Laboratory, respectively, University of California, Riverside.

Received for publication November 27, 1959. Accepted for publication January 19, 1960.






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