A pot experiment was conducted in a greenhouse using soil taken from a Red-Yellow Podzolic and sorghum as the test plant. The main objective of the experiment was to verify the following hypothesis: split application of phosphate fertilizer results in higher efficiency in the uptake of this nutrient by the plant.. The experiment was run from September 1983 till February 1984, a period in which high temperature prevails. The variables considered in this study were: date of liming, rates and forms of phosphate application1. Various levels of these factors were combined making up a total of 15 treatments for the second sorghum crop. The data collected were as follows, dry matter weight, contents of calcium,iron and aluminum phosphates of soil samples taken from each treatment. These data were statistically analysed at the CENA Computer Center. The following conclusions were drawn based on the experimental conditions and on the results obtained a. split application of phosphate led to a better use of phosphate fertilizer by the second sorghum crop. b. liming contributes to a better development of the plant which is enhanced by the application of phosphate fertilizer. c. limimg does not affect the availability of iron phosphoris d. there is an increase in the concentration of calcium phosphate due to lining and that increases with the rate of phosphorus application. e. the concentration of calcium linked to phosphates relates inversely to aluminum phosphate and to the yield of dry matter in the second sorghum crop.