地黄化感自毒作用消减技术研究

Research on abatement measures of allelopathic autotoxicity of Rehmannia glutinosa

目的:探讨不同消减技术措施对地黄化感自毒作用的影响。方法:以连作障碍消减率为指标,研究添加石灰氮、微生物菌剂及清水淋洗等土壤处理方法,牛膝轮作及绿肥施用,以及育苗移栽等方法对地黄化感自毒作用的消减程度。结果:以育苗移栽法效果最好,在出苗后20 d带土移栽和裸根移栽的连作障碍消减率分别达到了76.80%,71.70%;其次为添加微生物菌剂法,在添加剂量为中等剂量25 g时,连作障碍消减率能达到54.25%;以清水淋洗法和牛膝轮作及绿肥施用法的效果最差,尤其是不经牛膝轮作仅施用牛膝绿肥时,连作障碍消减率为负值,即加重了地黄的化感自毒作用。结论:除仅施用牛膝绿肥外,以上技术措施均能在一定程度上消减地黄的化感自毒作用。

Objective： To explore effects on allelopathic autotoxicity of Rehmannia glutinosa of different abatement measures. Method： The experiments for abating allelopathic effects of R. glutinosa were designed with the reducing rate as a indication, three measures of the treating soil with lime nitrogen, and water washing were employed, R. glutinosa- Achyranthes bidentata rotation system and using Achyranthes bidentata as green manure, and seedling transplant were also studied for the abatement effect. Result： Effect of seedling transplant was the best, reducing rate of transplant and bare root transplant on the 20th day after emergence was 76.80%, 71.70% , respectively. The reducing rate of the treating soil with microorganism reached 54.25%. The effects of water washing and R. glutinosa-A, bidentata rotation system and using A. bidentata as green manure were not satisfied. Especially only using A. bidentata as green manure without rotation system worsened the allelopathic effects of R. glutinosa. Conclusion： All measures can abate allelopathic effects of R. glutinosa to some extent except only using A. bidentata as green manure.