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White Phosphorus as a Phosphatic Fertilizer¹

ABSTRACT

White P, in amounts equivalent to phosphate fertilization rates, oxidized within 2 days in soils. Sorghum (Sorghum vulgare Pers.) and tomatoes (Lycopersicon esculentum Mill.) responded equally to white P and NH₄H₂PO₄ in greenhouse tests of neutral and calcareous soils. In an acid soil, the growth rate was delayed initially in the white P treatments compared to phosphate. Later growth narrowed the gap between the phosphatic sources. After liming the acid soil, the growth delay was absent and the yields from white P treatments were as great as from NH₄H₂PO₄. No evidence of phytotoxicity was found in these experiments.

¹ Contribution from the Department of Agricultural Chemistry and Soils, University of Arizona, Tucson. Taken from a M.S. thesis submitted by A. Rodriguez to the Graduate College. Journal Paper no. 1794 of the Arizona Agr. Exp. Sta., Tucson.

² Graduate Assistant, present address: Universidad de Sonora, Hermosillo, Sonora, Mexico; Associate and Assistant Professors, respectively.

Received for publication June 1, 1971. Accepted for publication November 2, 1971.