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Effect of Phosphorus on Some Physical Properties of Soils: II. Water Retention¹

ABSTRACT

Field studies showed that the use of phosphate fertilizers increased the amount of water present in the soil and facilitated tillage. Crop yields were closely related to the increased water content. Laboratory studies showed that P appreciably increased the water-holding properties of soils. This was found to be directly related to the increase in the negative charge of the soil particles and the charge was closely related to the Al-phosphate/Fe-phosphate ratio. In general increases in water-holding capacity were caused only by the larger rates of P, but in some instances 50 ppm P gave significant increases.

¹ Contribution from Department of Soil Science, North Carolina Agr. Exp. Sta., Raleigh, N. C. Journal Ser. Pap. 2068.

² Professor of Soil Science, North Carolina Agr. Exp. Sta.; Assistant Professor, Faculdad de Agronomia, Universidad Central de Venezuela, Maracay, Aragua, Venezuela; Instituto Para el Mejoramiento de la Produccion de Azucar, Mexico City, Mexico; and Assistant Professor, Brigham Young University, Provo, Utah, respectively. The junior authors were formerly graduate students at North Carolina State University.

Received for publication October 12, 1965. Accepted for publication March 16, 1966.