Effects of Organic Fertilizer on Fruit Quality and Acidified Soil Chemical Properties in Yantai Orchard

Objective] This study aimed to investigate the improving effect of organic fertilizer on acidified soil as wel as their ef-fects on fruit quality and quantity in Yantai orchard. Method] Plot experiment was conducted to investigate the effects of organic fertilizer on fruit yield and quality of Red Fuji and chemical properties of acidified soil. Result] The apple yield in acidified soil applied with organic fertilizer al increased. Under the application of biological organic fertilizer, the apple yield was higher, and it was 8.92% higher than that in the control group. Under the mixed application of chemical fertilizer and biological organic fertiliz-er, the growth and development of apple trees were improved, and the total soluble solid (TSS) content, vitamin C (Vc) content and TSS-acid ratio in mature apples al increased. The application of organic fertilizer significantly reduced soil acidity. Compared with those in the control group, the soil pH value, organic matter content and alkali-hydrolyzable nitrogen content under the ap-plication of biological organic fertilizer were increased by 8.33%, 15.10% and 30.80%, respectively. Conclusion] The application of biological organic fertilizer could improve the yield of apple in acidified soil.