Analysis of plant growth promoting rhizobacteria population in apple rhizosphere soils Effect of Residual Roots on the Biomass of Malus hupehensis Seedlings,Phenolic Acids and Microbiology in the Soil of Continuous Cropping Effects of Slightly Acid Electrolyzed Oxidizing Water on Apple Replanted Soil Environment Characterization of nematode communities in the soil of long-standing versus replanted apple orchards surrounding Bohai Gulf Changes of Soil Nutrition in Root Zone and Their Effects on Growth of the Replanted Apple Changes of Soil Nutrition in Root Zone and Their Effects on Growth of the Replanted Apple Effect of Organic Acids on Biomass and Physiological Characteristics of Malus hupehensis Seedlings Under Continuous Cropping Effect of Organic Acids on Biomass and Physiological Characteristics of Malus hupehensis Seedlings Under Continuous Cropping Effect of different irrigating concentrations of fermented organic fluid on the young apple tree biomass and the soil properties in replant soil