Excessive application of nitrogen and phosphorus fertilizers induces soil acidification and phosphorus enrichment during vegetable production in Yangtze River Delta, China

摘要: Intensive vegetable cultivation has developed very rapidly in China, and investigation of current soil nutrient problems fields their potential environmental risk is important for local management strategies. Three hundred sixty-six samples were collected from greenhouse fields, open rice/wheat rotation southern Jiangsu Province, the most intensive vegetable-producing areas Yangtze River Delta, analysis fertility status. Soil acidification P enrichment main identified this area production, with about 20 17% field soils, respectively, being extremely acid pH values below 5.0. In contrast, no soils under as acidic. Percentages sites Olsen-P concentrations < 90 mg/kg 61, 85 0% growing vegetable, rice/ wheat, respectively. The nitrogen (N) surplus exceeded 170 kg/ha/crop, phosphorus (P) 40 kg/ha/crop. Thus, production leads to risks N pollution nearby aquatic bodies. Insufficient supplementation potassium fertilizers was found some fields. Several ameliorative measures are proposed.