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Effect of Lime on Availability of Phosphorus in Zamorano Soils¹

ABSTRACT

Field studies were conducted over a 2-year period on experimental plots at the Escuela Agricola Panamericana situated in the valley of the Rio Yeguare at El Zamorano, Honduras, to study the effect of lime on the availability of soil P.

Yields of corn (Zea mays), sorghum (Sorghum vulgare), beans (Phaseolus vulgaris), and cowpea (Vigna sinensis) green manure were recorded. Highly significant yield increased were obtained when the acid soil (pH 5.5) was limed to raise the pH to 6.5. The highest yields were obtained on plots receiving both lime and P.

The major portion of the potentially available P in Zamorano soils is in the organic fraction. Analysis of the final soil samples showed that liming liberated the P locked up in the organic form and increased the efficiency of applied P for crop use.

¹ Contribution from the Department of Agronomy, Escuela Agricola Panamericana, El Zamorano, Honduras. Presented before Div. S-4, Soil Sci. Soc. Am., Nov. 21, 1963 at Denver, Colo.

² Professor of Soils. Appreciation is expressed to Messrs. Fernando Fernandez de Cordova and Jose R. Calvo for their help in conducting this study.

Received for publication December 30, 1963. Accepted for publication May 1, 1964.