The Migration And Transformation Of P In Soil-Leaf Vegetable Systems Amended With Pig Manure

The effects of long-term fertilization of pig manure on soil total P, organic P and available P in paddy soil, damp soil and red soil were studied in jiaxing, Zhejiang province, China. The purpose of the study is to clarify the law of phosphorus accumulation and runoff in long-term fertilization.The results showed that phosphorus accumulated in surface soil profile easily. Soil total P tended to move down-wards when pig manure was applied to paddy field. Fertilization 10 years, phosphorus would move to the 40 cm layers of the soil. There was significant correlation between soil organic matter and soil organic P in long-term fertilization. Soil available P accumulated in surface soil profile easily. The content of soil available P increased when pig manure was applied to paddy field. In areas with high levels of soil P, pig manure fertilization would increase soil phosphorus accumulation and movement. The content of soil phosphorus was more than the vigilance value in environment, implying the risk of soil phosphorus release to the water.The content of P accumulates at 0~15 cm and 15~30 cm in damp soil profile easily.The enrichment coefficient of phosphorus in roots,stems,leaves increased quickly.The enrichment coefficient from largest to smallest is leaves> roots> stems.The content of aluminum in plant cabbage from largest to smallest is roots>stems>leaves.The largest enrichment of aluminum is in the root.The content of iron in plant cabbage from largest to smallest is roots>leaves>stems. There was no significant correlation between soil organic matter and manganese in different fertilization.The content of P accumulates at 0~15 cm damp soil profile easily, The enrichment coefficient of phosphorus in stems increased quickly.The enrichment coefficient of leaf increased highest,but the content of P accumulates in root implying the risk of soil phosphorus release to the water.The enrichment coefficient of phosphorus in roots,stems,leaves increased quickly. The enrichment coefficient from largest to smallest is leaves>stems> roots.There was significant correlation between the plant roots, leaves, stems and soil available P in long-term fertilization.The content of aluminum in plant cabbage from largest to smallest is roots> leaves > stems. The content of manganese and iron in plant vegetables from largest to smallest is roots> leaves > stems,the sane as the aluminum.The content of P accumulates at 0~10 cm in red soil profile easily. The content of phosphorus in roots, stems, leaves increased quickly when pig manure was applied to red field.The enrichment coefficient of phosphorus in roots,stems, leaves increased quickly. The enrichment coefficient from largest to smallest is stems>leaves>roots.There was significant correlation between the plant roots and soil available P in long-term fertilization. There was no significant correlation between the plant stems,leaves and soil available P in long-term fertilization.The content of aluminum in plant cabbage from largest to smallest is roots> leaves > stems. The content of manganese and iron in plant vegetables from largest to smallest is roots> leaves > stems, the sane as the aluminum.The content of available P accumulates significantly when pig manure was applied to damp field.The content of soil organic P at 0~15 cm soil profile accumulates easily when pig manure was applied to damp field.The enrichment coefficient of leaf increased highest,but the content of P accumulates in root implying the risk of soil phosphorus release to the water.The enrichment coefficient of phosphorus in roots,stems,leaves increased quickly. The enrichment coefficient from largest to smallest is leaves>stems> roots.The form of phosphorus changes from Al-P, Fe-P, Mn-P into the mixed state to Al-P as the main form when pig manure was applied to paddy field. The form of phosphorus at 0~15 cm changes from Al-P, Fe-P to Mn-P in the mixed state form when pig manure was applied to paddy field at 0~15 cm.The form of phosphorus at 0~10 cm Mn-P as the main form, at 10~20 cm changes from Al-P, Fe-P to Mn-P in the mixed state form when pig manure was applied to red field. There was significant correlation between the plant roots and soil available P in long-term fertilization.The enrichment coefficient of roots phosphorus in damp soil and red soil increased quickly. The results showed that phosphorus mainly from the soil.