云南玉溪烤烟套作紫甘薯最佳栽插期试验

[目的]探索烤烟紫甘薯套作模式下紫甘薯的最佳栽插期,为提高云南玉溪山地烟套种紫甘薯的产量及经济效益提供科学依据.[方法]在山地烟种植后期,分别于2012年7月10、20、30日和8月9、19日5个不同时期套种栽插紫甘薯,比较紫甘薯的生长发育特点、产量和经济效益.[结果]在玉溪市,7月30日前套种紫甘薯产量差别不大,从8月开始,随着栽插时间的延后,紫甘薯产量急剧下降,其中以7月30日栽插的紫甘薯产量最高,为13986.0 kg/ha,较8月9、19日栽插的紫甘薯产量差异显著,经济效益差别亦较大.[结论]在玉溪市进行山地烟后期套种紫甘薯,以7月下旬～8月初或采完烟株腰叶开始采上二棚叶时套种紫甘薯较适宜.

Optimal planting date of purple sweetpotato intercropped with tobacco

[Objective]The optimal planting date of sweetpotato relay intercropped among tobacco was screened to provide scientific references for improving its yield and economic benefits. [ Method]The growth traits, yield and economic benefits of intereropped sweetpotato with tobacco were investigated on different transplanting date of Julyl0,July 20,July 30,August 9 and August 19, respectively. [Result]In Yuxi, no significant difference of yield was found among plots trans- planted before July 30, and the yield of plots transplanted after August 1 decreased severely. Yield of plots transplanted in July 30 was the highest （13986.0 kg/ha） and significantly higher than that of plots transplanted on August 9 and August 19. The economic benefits differed vastly, too. [Conclusion]For sweetpotato intercropping with tobacco in high land in Yuxi City, the optimum transplanting date was considered to be from late July to early August, when the low level tobacco leaves had been harvested.