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This article in SSSAJ

  1. Vol. 29 No. 4, p. 458-460
    Received: Aug 17, 1964



Effect of Phosphorus on Some Physical Properties of Soils: I. Modulus of Rupture1

  1. J. F. Lutz2 and
  2. Rafael A. Pinto3



Applications of phosphorus, both as phosphoric acid and as monocalcium phosphate, to three soils were very effective in reducing the hardness of soils as measured by modulus of rupture. Phosphoric acid was more effective than monocalcium phosphate on all three soils. Both sources of P were more effective on Iredell soil, which consists predominantly of montmorillonite with some kaolinite, than on White Store soil, which contains montmorillonite and kaolinite but with some illite. Even though both sources of P produced significant decreases in modulus of rupture on the Georgeville soil, which contained predominately 1:1 clay minerals, the results were not as striking as on the Iredell. The greatest effect per unit of P was produced by the smaller increments, especially by the 50-ppm rate. This is especially important from both agronomic and economic standpoints since 50 to 100 lb/acre are feasible rates.

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