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A Simple Chemical Method for Evaluating the Agronomic Potential of Granulated Phosphate Rock¹

ABSTRACT

A simple, chemical method which does not involve shaking the sample and which employs an H-resin was used to evaluate the solubility of two granulated phosphate rocks over a range of granule sizes. It was found that the solubility decreased drastically as the granule size increased from the average diameter of 0.05 mm to 1.00 mm. The conventional citrate extraction method which involves shaking the sample cannot be used in this case because the granules disintegrated upon being shaken and this results in essentially the same solubility value being recorded for all samples regardless of the granule size. A highly significant linear relationship between the drymatter yield of corn (Zea mays L.) (6 weeks in greenhouse) and the solubility of the granulated rocks suggests that the proposed H-resin method can be used to predict the potential of granulated phosphate rock for direct application.

¹ Contribution from the Fertilizer Technology Division and Agro-Economic Division, Int. Fert. Dev. Cent., (IFDC) Muscle Shoals, AL 35660.

² Research Chemist (Soils) and Soil Scientist, respectively.

Received for publication January 30, 1978. Accepted for publication March 3, 1978.