[Runoff loss ways of nutrients in non-irrigated farmland in Hefei outskirts].
Taking non-irrigated flatlands in Hefei outskirts as experiment observation areas, yellow brown soil as selected soil type, and < 3 degrees as ground slope, the time of runoff development, runoff quantities, and silt carrying capacity under different rainfall intensity were observed on the non-irrigated farmlands with different kinds of crops such as grain, oil, cotton and vegetables, and with different coverage for continuous 3 years. Based on the observation, water and soil samples were collected and analyzed. The results showed that the loss way of the surface soil and nutrients in non-irrigated flatlands was obviously different from that on the sloping fields and on the upland. Over 98% of available N, P, and K nutrient loss were run off by chemical erosion. Physical erosion was the main way of the surface soil and organic matter loss, and 96.14% of total organic loss was caused by physical erosion.
Zhou
J
J
Department of Soil Agrochemistry, Anhui Agricultural University, Hefei 230036.
Zhu
J
J
D004463:Ecology; D004787:Environmental Pollution; D012987:Soil / Q000032:analysis*
D012987:Soil