Rhizosphere pH and phosphorus forms in an Oxisol cultivated with soybean, brachiaria grass, millet and sorghum

摘要: Plants have shown different responses to fertilization with rock phosphate, including through alteration of the attributes rhizospheric soil. The objective this study was evaluate soil pH alterations and in contents forms phosphorus rhizosphere fertilized phosphate as a result cultivation species plants. An experiment developed under greenhouse conditions an Oxisol cultivated four species. Treatments consisted soybean - Glycine max (L.) Merrill, brachiaria grass Brachiaria brizantha Hochst Stapf, millet Pennisetum glaucum R. Brown, sorghum Sorghum bicolor Moench grown PVC columns filled divided nylon screen (25 µm mesh) impede root growth part column. After 45 days cultivation, into layers 0-1, 1-2, 2-3, 3-4, 4-5, 5-7, 7-9, 9-14 mm from rhizoplane air dried determine P Hedley fractionation. In 1-2 2-3 layers, caused increase when compared control treatment (without plants). other there were no due millet, grass, reduced inorganic content most labile only 0-1 layer rhizoplane.