[Effects of phosphorus application methods on phosphorus loss on sloping land under simulated rainfall]

A simulated rainfall experiment was conducted to study the effects of three phosphorus application methods on phosphorus loss and its forms in loss process. The results showed that the bio-available P (BAP) loss in runoff was positively correlated to the mixed intensity of P applied into soil. Under mixed application (MA), the dissolved phosphorus (DP) concentration, BAP concentration, DP/BAP and BAP/TP ratio in runoff were all the highest, and those under point application (PA) were the second. Under line application (LA), DP and BAP concentrations were low, DP/BAP and BAP/TP ratio were also relatively low, and the difference compared with control was insignificant. According to the reduction of P loss, the order of the three P application methods was LA > PA > MA.