高磷黏性设施菜地土壤磷肥减施效应研究OA

To examine the integrated impacts of phosphorus(P)fertilizer reduction in a high-P facility vegetable system,a field experiment with five consecutive harvests of Chinese cabbage(Brassica rapa var.chinensis)was conducted on a typical high-P clayey vegetable soil(total P＞2 g/kg)in Hangzhou City of Zhejiang Province.The experiment included five treatments:conventional P application(P1)and P reduction by 25%(P2),50%(P3),75%(P4),and 100%(P5).The effects of P fertilizer reduction on Chinese cabbage growth,soil enhancement,and P activation were systematically evaluated.The results were as follows.1)Compared with the P1 treatment,the P fertilizer reduction treatments did not inhibit the agronomic traits or the uptake of nitrogen and potassium in Chinese cabbage;instead,they overall promoted plant growth and increased yield by 23.54%-43.31%.The 75%P fertilizer reduction treatment(P4)showed the most pronounced yield-increasing effect,demonstrating a synergistic"P reduction with benefits"effect.2)P fertilizer reduction improved soil physicochemical properties to some extent:the soil pH value increased by 0.04-0.11 units,and organic matter increased by 2.56%-8.26%;under the 25%-75%P reduction treatments(P2-P4),both the soil available P content and the P activation coefficient were higher than those under the P1 treatment.3)P fertilizer reduction altered the profile of soil phosphatase activities,characterized by suppressing alkaline phosphatase activity and increasing neutral and acid phosphatase activities.In conclusion,a 75%P fertilizer reduction in high-P clayey facility vegetable soils can maintain a high yield of Chinese cabbage while effectively improving soil physicochemical and biological properties,thereby achieving both economic benefits and environmental sustainability.