Abstract:

In order to study the self-allelopathy and the mechanism of continuous cropping obstacle, using distilled water as extracting agent, allelopathic effect of extracts in different concentrations of peach tree roots on growth of Maotao seedlings (Prunus persica L. Batsch) was studied. The results showed that leaf area, length, width, circumference, length/width ratio, height, trunk girth, maximum root length, shoot fresh and dry weight were promoted in lower concentration and inhibited in higher concentration. The inhibition was gradually strengthened with increasing concentrations when extracts concentrations were higher than 1:20 (mass proportion between root and water). However, the inhibition on root fresh and dry weight gradually increased with increasing concentrations. The treatment with specific leaf weight of 1:5 was higher than other treatments by the end of the experiment. Self-allelopathy was obvious when Maotao seedlings were irrigated with high-concentration extracts which led to retarded growth rate and disturbance of growth.