| Popis: |
An ecological pond was built to collect lost nutrients from the wheat-season farm outfall, and vegetables were planted in the pond to explore a new strategy for reducing agricultural production pollution and improving environmental safety. During the wheat season, overland runoff occurred eight times; The total farmland overland runoff was 1 119.0 m3·hm-2, and the irrigation-drainage cell area was 5.2 hm2. Two fertilizer practices were also investigated:the farmers' fertilizer practice(NN) and an optimized fertilizer practice(EN). Overland runoff losses on NN farmland were 4.5(Total nitrogen, TN), 0.5(Total phosphorus, TP), and 4.0(Total potassium, TK) kg·hm-2. Overland runoff losses decreased on EN farmland; with 3.9(TN), 0.4(TP), and 3.8(TK) kg·hm-2, respectively. The total overland runoff losses were 23.3(TN), 2.4(TP), and 20.8(TK) kg. Celery and ryegrass in the ecological pond intercepted the N, P, and K farmland nutrient losses (18.0, 1.9, and 22.0 kg, respectively), accounting for 77.3%(N), 79.2%(P), and 105.8%(K) of the irrigation-drainage cell inflow. The scaled ecological pond to farm proportion was 1:43~50. |
