Abstract:

Phosphorus of orchards soil profile in the main product areas ‘Ganximiyou’ in Pinghe County were analyzed for resolving the problem of phosphorus bioaccumulation, by the method of field investigation and laboratory analysis, phosphorus leaching criterion of surface soil (0-20 cm) were approached. The results were as follows: Olsen-P of orchards was higher than phosphorus of soil profile, the best bioaccumulation factors was 289.1, and the available P was bigger than the criterion which the plant need P fertilizer or not. There were obvious different layers in CaC12-P of orchards, decline as the deep of soil profile. CaC12-P of all layers was bigger than the same deep of nature soil profile, the best bioaccumulation factors was 152.0. CaC12-P increased sharply when Olsen-P reached to a certain level, phosphorus leaching criterion of surface soil (0-20 cm) of 1, 2, 3, 11 soil profile were 101.99, 90.59, 68.54, 56.03 mg/kg, but when the soil were added phosphorus to 400 mg/kg, there were not sharply change of 7, 12 nature soil profile. Improvement measures were brought forward. Ratio of different fertilizer was optimized through soil testing and formulated fertilization, stops fertilizing or reduce the input of P fertilizer. Applied soil phosphorus activator and cooperated planting mulch grasses.