Eff ects of Diff erent Soil Improvement Measures on Acidifi ed Greenhouse Vegetable Fields in Jiaodong Area
（1Institute of Agricultural Resources and Environment，Shandong Academy of Agricultural Sciences，State Key Laboratory of Nutrient Use and Management，Key Laboratory of Wastes Matrix Utilization，Ministry of Agriculture and Rural Aff airs，Ji’nan250100，Shandong，China；2Administrative Enforcement Bureau of Mengyin County，Linyi 276200，Shandong，China）
Abstract：Abstract：Surface soil acidification is an important factor limiting the improvement of vegetable yield and quality．The application of soil amendments and organic fertilizers is an eff ective measure to alleviate soil acidification．In this study，control treatment，silica-calcium-potassium-magnesium soil conditioner treatment and shell powder conditioner treatment were designed to select acid soil amendments in Haiyang，Shandong Province by fi eld experiments．On this basis，control treatment，chicken manure source，cow manure source and vermilion waste source organic fertilizers were designed to reveal the eff ects of diff erent soil amendments and sources of organic fertilizers on the yield and quality of greenhouse tomatoes，and provide theoretical basis for further optimizing fertilization，improving soil，and increasing tomato yield and quality．The results indicated that the greenhouse surface soil of Jiaodong Area showed a tendency of acidification，and the pH decreased by 0.06 units. Compared with the traditional control treatment，the application of soil conditioner with silica-calcium-potassium-magnesium could increase the yield of tomato averaged by 12.9%，which was related to the increase of fruit diameter and single fruit weight of tomato．The content of VC in tomato fruit was increased by 15.0% and 12.2% by silica-calcium-potassium-magnesium soil conditioner and shell powder conditioner，respectively．On the basis of the application of silica-calcium-potassium-magnesium soil conditioner，organic fertilizer from chicken manure and vermicelli waste could signifi cantly increase tomato yield averaged by 15.4% and 17.8%，which was related to the increase of tomato plant height，fruit diameter and single fruit weight．Organic fertilizer from vermicelli waste could significantly increase VC content of tomato averaged by 14.9%．Correlation analysis showed that soil pH in 0-20 cm soil layer was positively correlated with yield，plant height，fruit diameter，fruit weight and fruit VC content．In summary，the combination of silica-calcium-potassium-magnesium soil conditioner with organic fertilizer from vermicelli waste can alleviate the acidifi cation of the surface soil and increase the yield and fruit quality of tomato.
