不同浓度多效唑对甘薯生长特性及产量的影响
2020-12-21史婵张菡张兴端李秋卓
史婵 张菡 张兴端 李秋卓



摘要 以万薯5号为试验材料,采用叶面喷施方法,按照喷施浓度设置4个处理,研究多效唑的不同喷施浓度对甘薯生长特性及产量的影响。结果表明,喷施一定浓度的多效唑能够促进甘薯的基部分枝数,抑制甘薯主蔓长度和主茎粗的增长,抑制甘薯地上部分藤叶的生长,对地下部分的影响则表现为促进甘薯块根的膨大,提高甘薯的干物质率;当喷施浓度过高时,对甘薯地上部分的抑制作用减弱,甚至低于不喷施多效唑的水平,對地下部分的促进作用也转为反向抑制作用,甘薯鲜薯产量低于对照,且差异显著,甘薯干物质率比对照降低。
关键词 多效唑;喷施浓度;甘薯;生长特性;产量
中图分类号 S531文献标识码 A
文章编号 0517-6611(2020)22-0037-03
doi:10.3969/j.issn.0517-6611.2020.22.011
Effects of Paclobutrazol at Different Concentrations on the Growth and Yield of Sweet Potato
SHI Chan,ZHANG Han,ZHANG Xing-duan et al (Chongqing Three Gorges Academy of Agricultural Sciences, Chongqing 404155)
Abstract The effects of different spraying concentrations of paclobutrazol on growth characteristics and yield of sweet potato were studied with Wanshu No.5 as experimental material. The results showed that spraying certain concentration of paclobutrazol could promote the number of basal branches, inhibit the growth of main stem length and stem diameter, and inhibit the growth of some vine leaves aboveground, the effect on the underground part is that the root tuber of sweet potato is expanded and the dry matter rate of sweet potato is increased;when the spraying concentration is too high, the inhibition on the aboveground part of sweet potato will weaken, even lower than the level without spraying paclobutrazol, the yield of fresh sweet potato was lower than that of the control, and the difference was significant. The drying matter rate of sweet potato was also lower than that of the control.
Key words Paclobutrazol;Spraying concentration;Sweet potato;Growth characters;Yield
基金项目
农业农村部国家现代农业产业甘薯技术体系国家甘薯产业技术体系万州综合试验站项目(CARS-10-C21);重庆市科技局项目“甘薯鲜食营养型及高直淀粉组分新品种创制”(cstc2019jscx-gksb0288)。
作者简介 史婵(1987—),女,湖南益阳人,助理研究员,硕士,从事甘薯育种与栽培研究。*通信作者,高级农艺师,硕士,从事甘薯育种与栽培研究。
收稿日期 2020-04-10
甘薯是西南山区,特别是重庆地区大田主栽作物,近几年常年种植面积在37万hm2左右。由于重庆主要分布在长江沿线,以丘陵、低山为主,平均海拔为400 m;气候温和,属中亚热带湿润气候,降雨量充沛,所以重庆总的生态环境非常适合甘薯的种植[1]。但也因为西南山区地理及环境原因,降水多集中在春夏之间,导致甘薯地上部分容易徒长[2],间接导致地下部分产量降低,且淀粉含量下降,严重影响甘薯的经济产量。……
