Pot culture experiments for the investigation of methods of application of powdered rock phosphate were conducted on a red earth and a slightly calcareous alluvial soil. The former is extremely deficiency in phosphatic nutrients, having a pH of 4.8, while the latter is a very fertile soil of about neutral reaction. Both soils received pretty supply of nitrogeneous and potassic fertilizers with following variations of phosphorus treatment. Rice was used as an indicating crop.
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周正浩,刘同仇.磷矿粉施用法试验结果初步报告[J].土壤学报,1957,5(3):215-222. C. H. Chow, T. C. Leu. A PRELIMINARY STUDY ON THE METHOD OF APPLICATION OF POWDERED ROCK PHOSPHATE[J]. Acta Pedologica Sinica,1957,5(3):215-222.