The response of the organic phosphorus fractions to green manure application as a function of the phosphate fertilizer

To understand the response of organic phosphorus (Po) fractions at the manure microsite to green manure (GM) application affected by a phosphate fertilizer, an incubation experiment was conducted. Stylosanthes GM (10 or 40 t/ha) with or without MCP (monocalcium phosphate containing 100 kg/ha P2O5) was put on the soil cylinders surface. They were incubated for 14 and 28 days. The results indicate that the movement distance and content of the Po fractions (labile Po, moderately labile Po. moderately stable Po and highly stable Po) were significantly increased by MCP addition, and that the Po fractions movement distance was less than 3 cm after 28 days of incubation. Our results clearly confirmed the content and movement distance of the Po fractions after different incubation periods with or without MCP addition, which improved the efficiency of combined P and GM use and decreased the environmental load due to P pollution caused by GM and phosphate fertilizer.