Effects of organic fertilizer replacing part of chemical fertilizer on grape growth and fruit quality
In order to reduce the use of chemical fertilizer in vineyards,improve soil and fruit quality,5-year-old Hutai 8 grape was used as experimental material to study the effects of 1 t/667 m2,3 t/667 m2,5 t/667 m2,and 7 t/667 m2 organic fertilizer treatments replacing 50 kg/667 m2 potassium sulfate compound fertilizer on soil physicochemical properties,tree growth and development,and fruit quality.The results showed that replacing part of chemical fertilizer with organic fertilizer could improve soil permeability,decrease soil pH val-ue,and improve soil microenvironment compared to only applying chemical fertilizer.Compared with the appli-cation of 100 kg/667 m2 potassium sulfate compound fertilizer alone,the treatment of replacing 50 kg/667 m2 potassium sulfate compound fertilizer with 5 t/667 m2 organic fertilizer significantly increased soil organic mat-ter content,total nitrogen,available phosphorus,and available potassium content by 30.98％,16.79％,43.04％,and 19.08％,respectively.Branch length,roughness,and chlorophyll content were increased by 11.46％,7.27％,and 6.45％,respectively.Single floral cluster weight,single grain weight,hardness,solu-ble solids,and soluble sugars were increased by 19.19％,8.31％,17.90％,8.49％,and 8.26％,respective-ly,while titratable acid content decreased by 12.24％.Based on comprehensive analysis,it is believed that re-placing 50 kg/667 m2 potassium sulfate compound fertilizer with 5 t/667 m2 organic fertilizer has better effect and is suitable for promotion and application in Shaanxi region.
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