[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.
Li
Yuyuan
Y
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling 712100. lyyuan65@163.com
Shao
Ming'an
M
D000383:Agriculture; D001682:Biological Availability; D008962:Models, Theoretical; D010758:Phosphorus / Q000378:metabolism*; D011891:Rain; D012987:Soil / Q000032:analysis*
D012987:Soil; D010758:Phosphorus