Abstract:

ing at the occurrence of plant physiological iron-deficiency chlorosis in the production of Yuxi blueberry, the blueberry variety ‘Britewell’ was taken as the test sample, and the field test and laboratory analysis were used to conduct the experimental study from 2017 to 2018. The results showed that the key techniques of blueberry planting, such as regulating soil acidity by acid microbial organic fertilizer+ blueberry soil improvement matrix, balancing the application of N, P, K fertilizer and fully water-soluble organic fertilizer, and applying chelated iron to soil and leaf surface, could significantly reduce the pH of blueberry rhizosphere soil and increase the active Fe content. Mild and moderate chlorosis plants were treated to be normal or basically normal plants, and severe chlorosis plants were treated to be mild to moderate chlorosis plants. The SPAD value and Fe and Mn content of leaves were significantly increased, the Ca/Fe and Ca/Mn ratio were decreased, the blueberry fruits were plump, and the hundred-grain weight was increased, which could provide scientific references for the treatment of physiological iron-deficiency chlorosis in blueberry production.

Key words: blueberry, soil pH adjustment, fertilization, chlorosis, rectification effects