Effect of reduced water and fertilizer inputs on yield and nitrogen surplus in greenhouse eggplant system in Mollisols
Excessive fertilization and frequent irrigation are common problems in facilities vegetable production of Mollisols.The effects of water and fertilization reduction on facilities greenhouse vegetables yield,soil NO3--N accumulation amount and soil nitrogen surplus in the soil-vegetable system in Mollisols were studied,which could provide a scientific basis for optimizing nitrogen nutrient management technology,and reducing nitrogen loss and environmental pollution.This study took typical Mollisols vegetable field as the research object.Four treatments were set up,including no nitrogen fertilization treatment(CK),conventional water and fertilizer treatment(WF),80%conventional water treatment(80%WF),and 80%conventional fertilizer treatment(W80%F).This research aimed to study the effects of water and fertilization reduction on the eggplant yield,nitrogen utilization rate,soil inorganic nitrogen accumulation and nitrogen surplus in the soil-vegetable system.Yield was significantly higher in WF,80%WF and W80%F treatments,compared to CK treatment.Yield in W80%F treatment was no significant change compared with WF treatment,but yield in 80%WF treatment was significantly reduced by 6.44%to 8.40%.Nitrogen uptake did not change significantly in the water reduction and nitrogen reduction treatments compared to the WF treatment.Nitrogen fertilizer utilization,nitrogen fertilizer agronomic efficiency,and nitrogen fertilizer bioproductivity were significantly reduced by 11.00%,56.66%and 6.21%in the 80%WF treatment,respectively,compared to the WF treatment,while nitrogen fertilizer agronomic efficiency,and nitrogen fertilizer bioproductivity were significantly increased by 11.22%and 24.69%in the W80%F treatment,respectively.At the same time,the accumulation of nitrate nitrogen in the 0-100 cm soil layer was significantly increased by 3.90%-7.73%in the WF treatment and significantly decreased by 3.60%-6.07%in the W80%F treatment,compared to the WF treatment,and the soil nitrogen surplus was maintained at 195.24-234.69 kg/hm2.In addition,soil nitrogen surplus was significantly correlated with irrigation,nitrogen application and nitrate nitrogen accumulation.The water reduction and nitrogen reduction treatments markedly increased the nitrogen surplus in the 0-60 cm soil and effectively preserved nitrate nitrogen in the 100 cm soil layer,reduced the risk of leaching and achieved the dual purpose of efficient production and reducing environmental pollution.
water reduction and nitrogen reductionfacility eggplantsoil profilenitrate accumulationnitrogen surplus
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