附子秸秆残茬对水稻的化感效应

目的]探明附子秸秆残茬对水稻的化感效应。方法]通过添加附子秸秆残茬不同腐解液,采用平板培养法进行水稻种子萌发和幼苗生长试验。结果]除秸秆残茬添加附子田土壤腐解15 d原液(SBW15)处理7 d外,其余附子残茬腐解原液处理3 d与7 d的水稻种子均不发芽,其25%稀释液处理3 d亦不同程度抑制水稻种子萌发与根系生长,但处理7 d对根系生长表现出抑制与促进双重作用;除25%SBW15稀释处理7 d外,其余腐解液对水稻发芽率、根长及发芽指数均表现化感抑制作用,且处理3 d的抑制作用强于7 d。结论]附子秸秆残茬对水稻的化感效应与秸秆残茬腐解液浓度及处理时间有关。

Allelopathic Effects of Aconitum carmichaeli Dexb.Sstraw on Rice

Objective]This study aims to study the allelopathic effect of Aconitum carmichaeli Dexb.straw on seed germination and growth of rice.Method]The rice seed germination test and the rice growth test were carried out using the plate culture method by adding different decom-position liquids of straw. Result] Except the 7 days treatment of decomposition liquid prepared by immersing straw and soil for 15 days (SBW15), there was no seed germination under any treatments of decomposition liquids addition.The 25 percent diluents of different decomposi-tion liquids were also found to inhibit the germination of rice seeds, however, the 25 percent diluents showed both inhibition and promotion effects on the growth of rice root.Except the 7 days treatment of 25 percent diluent of SBW15, all the other decomposition liquids showed inhibitory allel-opathic effects in rice seed germination rate , root length and seed germination index , and the inhibitory effect under 3 days treatment were stron-ger than that under 7 days treatment.Conclusion]Allelopathic effects of Aconitum carmichaeli Dexb.straw on rice are related to the concentra-tion of straw decomposition liquids and the time of treatment .