Movement and distribution of phosphorus in soil under drip fertigation of KH2PO4 solution
滴施磷酸二氢钾后土壤中磷的移动和分布

In order to evaluate the movement and distribution of phosphorus fertilizers in soils under drip fertigation, a soil column experiment was conducted to simulate drip fertigation. The results indicated that: (1) KH2PO4 moved vertically 22 cm in sandy loam soil, 16 cm in light loam soil and 14 cm in clay loam soil, respectively; P moved similar distance both in vertical and horizontal direction. (2) In lateritic soil, the higher P concentration was, the longer distance P moved in vertical direction. In terms of available P, vertical P movement in treatments of 200, 400, 800 and 1 000 mg/L were 12, 14, 20 and 22 cm, respectively; Both of total P and available P were significantly concentrated in the layer of 0 - 8, 0 - 12, 0 - 18 and 0 - 20 cm in the treatments of 200, 400, 800 and 1 000 mg/L, respectively. It is concluded that drip fertigation with high P concentration solution could increase the distance of P movement