Abstract: In order to solve the serious problem caused by excessive fertilization and continuous cropping obstacles that soil nutritional indexes of elderly kiwifruit orchard gradually worsen in Meixian,Shaanxi,the influence of applying three different microbial fertilizers mixed with humic acid on dynamic of soil nutrients system in growth periods of kiwifruit(germination,florescence,fruit enlargement,fructescence and next germination period)and fruit quality were studied through field experiment by using traditional fertilization as control(CK). The result showed that three kinds of compound microbial fertilizers could significantly increase the number of bacteria,actinomycetes and yeasts in kiwifruit rhizosphere,and reduce the number of fungi,so as to improve and balance the soil microbial community structure;These treatments could significantly increase soil enzyme activity of kiwifruit(especially JKY,whose effect was most remarkable,its sucrase was 48.65%-255.51% higher than that of CK in different periods,phosphatase was 30.23%-60.23% higher than that of CK,polyphenol oxidase was 106.22%-182.04% higher than CK,protease increased 13.74%-126.12% compared with CK,and urease was 21.17%-177.41%),enhance soil fertility(nitrate and ammonium nitrogen,available phosphorus and potassium,total nitrogen,total phosphorus,total potassium and organic matter content increased significantly),and decrease soil pH(the soil pH in the JKY group decreased by 0.25-0.48 units compared with the control).Compound microbial fertilizers could increase fruit firmness and vitamin C,soluble sugar content of kiwifruit,and reduced the content of titratable acid. Comprehensive analysis showed that the three kinds of compound microbial fertilizer could improve elderly kiwifruit orchard soil,improve the quality of the kiwi fruit.

Key words: Humic acid compounded microbial fertilizer, Kiwifruit, Soil enzyme, Soil microorganism, Soil physical and chemical properties, Fruit quality

CLC Number: 

• S151.01