Effects Of Reduced Fertilizer Application On Vegetable Quality And Soil Properties In Protected Facilities

In recent years,fertilization has been an important measure for supplementing soil nutrients in solar greenhouses in facility vegetable production,but excessive fertilization has brought many problems,how to reduce the use of chemical fertilizers,reduce their pollution to vegetable quality and the environment,and for the sustainable development of agriculture Very important.In this paper,the Tianjin Fengbang Vegetable Plantation Cooperative was used as the experimental site to study the effects of reduced application of phosphorus and potassium fertilizers on facility tomatoes and reduced application of chemical fertilizers on facility green pepper yield,quality and soil properties.It has important guiding significance for improving the output quality of Tianjin’s facility vegetables,improving the problem of excessive soil fertilization in Tianjin,and promoting the green and efficient development of the local facility vegetable industry.The main findings are as follows:In the case of a certain amount of organic fertilizer and nitrogen and potassium fertilizer,in high-level phosphorus content soil,the application of reduced or no phosphorus fertilizer has no effect on the yield of tomato in the greenhouse.Reduced application of phosphorus fertilizer can increase the Vc content of tomato pulp and reduce its titratable acidity.Nitrate in tomato pulp has little effect;soil organic matter increases with the decrease in the amount of phosphorus fertilizer application,and reducing the application of phosphorus fertilizer has little effect on total nitrogen,total phosphorus and total potassium in the soil;reducing or not applying phosphorus fertilizer can reduce the available phosphorus in the soil Content,but the available phosphorus in different treatments is still at a relatively high level and has little effect on soil nitrate nitrogen,but the application of phosphorus fertilizer significantly increases the soil available potassium content;the reduction of phosphorus fertilizer reduces the p H and EC values in the soil.In the case of a certain amount of organic fertilizer and nitrogen and phosphorus fertilizers,in high-level potassium content soils,the application of reduced or no potassium fertilizer has no effect on the yield of tomato in the greenhouse.The reduced application of potassium fertilizer can reduce the titratable acidity in tomato pulp and increase the Vc content.,Has little effect on nitrate in tomato pulp;reducing the application of potassium fertilizer has no significant effect on total nitrogen,total phosphorus,total potassium,and organic matter in the soil;due to the high content of available potassium in the soil itself,the effect of reduced potassium fertilizer on soil available potassium Large,has little effect on soil nitrate nitrogen,but the application of potassium fertilizer significantly increases the soil available phosphorus content;the reduction of potassium fertilizer reduces the p H and EC values in the soil.Under different fertilization treatments,in the soil with high levels of available nitrogen,phosphorus and potassium content,organic fertilizers can replace chemical fertilizers to increase the yield of green peppers in greenhouses,and can also increase the content of Vc in green pepper pulp.Increased application of organic fertilizer significantly increased the content of organic matter,from 34.00 g/kg to 60.77 g/kg,an increase of 79 %.The contents of total nitrogen and total phosphorus in the soil increased,with little effect on the total potassium content The soil itself has a high content of available nitrogen,phosphorus and potassium,so the substitution of organic fertilizers for chemical fertilizers has little effect on the effective nutrients of the soil;the substitution of organic fertilizers for chemical fertilizers reduces the p H and EC values in the soil;the soil enzyme activity of high-level organic fertilizer treatments is high for low-level organic fertilizer treatment.