In order to provide scientific basis for rational application of pig manure as an organic fertilizer in typical red soil sloping lands

a field runoff micro location test in peanut-grown red soils that developed from three typical parent materials (granite

red sandstone and red clay) was conducted for three consecutive years to monitor the effects of different pig manure amounts on water and soil loss and phosphorus loss in red soils in mid-subtropical region of China. The treatments included six application rates of pig manure (phosphorus content was 0

0.5

1

2

4 and 8 times that of the control) that combined with half amount of local conventional chemical fertilizers

and the application of conventional chemical fertilizers alone was took as the control. The results showed that runoff and sediment were obviously reduced by the application of pig manure

but the phosphorus content in runoff and sediment increased linearly with the increasing of pig manure application rate

and this suggested a growing environmental risk. Runoff and sediment volume of the three red soils listed in the order of were granite > red sandstone red > red clay red. When the pig manure application rate was 3 500 kg/(hm2·a)

runoff and sediment reduced by 28.0% and 6.3%

respectively

in the red soil developed from granite

and the above two parameters reduced by 23.2% and 37.1%

respectively

in the red soil developed from red sandstone. When the pig manure application rate was 7 000 kg/(hm2·a)

runoff and sediment reduced by 40.7% and 12.8% respectively in the red soil developed from red clay. When the pig manure application rates were 14 000

28 000 and 28 000 kg/(hm2·a) for red soils from granite

red sandstone and red clay

respectively

the average total phosphorus content in runoff exceeded the standard value of Environmental Quality Standards for Surface Water of Class V. Total phosphorus content in runoff of the three kinds of red soil listed in the order of granite > red clay > red sandstone

and total phosphorus content in sediment of the three red soils listed in the order of red clay > granite > red sandstone. Under the condition of halving the conventional amount of chemical fertilizer

applying pig manure at the rate of 40 kg P/(hm2·a) for soils developed from granite and red sandstone

and at the rate of 80 kg P/(hm2·a) for the soil developed from red clay

could effectively reduce water and soil loss without increasing the risk of phosphorus loss over 3 years.