Abstract:

An apple rootstock, Malus hupehensis Rehd. was chosen as the experimental materials，potted with replant soil. Effects of organic materials including chicken manure, sheep manure, cow manure on seedling biomass, soil enzyme activities and the number of soil microorganisms were investigated. The results showed that application of organic materials significantly increased the activities of soil enzyme. And compared with the control group, the activities of soil urease, catalase, and invertase with treatments ascended in varying degrees. Three treatments markedly increased the amounts of bacteria and actinomycetes but decreased the amount of fungi in soil. All treatments were significantly enhanced plant height, stem diameter close to ground, fresh weight of root, dry weight of root, fresh weight above ground, and dry weight above ground. Of them, chicken manure treatment increased most, and was 213.91%, 80.00%, 332.40%, 325.78%, 487.40% and 480.95% larger than control, respectively. All results showed that application of three organic materials could alleviate replant diseases in different degrees.