Characteristics of agriculture soil phosphorus leakage under the simulated conditions.

Through soil columns leaching,the effects of rainfall intensity,rainfall amount and different organic manures on phosphorus leakage were investigated. Results showed that the load of phosphorus leaching augmented following with rainfall amount,and had no relationship with rainfall intensity. The load of phosphorus leaching was higher in the paddy season than other season,with the highest load up to 709g/hm2. The power relationship between phosphorus leaching load and rainfall amount could be best expressed as the coefficient correlation of 0.861**～0.962**. Cow manure combining with chemical fertilizer increased phosphorus leaching in soil,and straw inhibited the phosphorus leaching to simultaneously reduce phosphorus migrating ability.