Abstract:

In order to improve the lodging resistance of quinoa in agricultural production and select the best concentration of plant growth retarder to reduce the lodging rate of quinoa， the randomized block experiment was conducted to investigate the effects of paclobutrazole （PP333）， enisobutrazole （S3307） and binomide （MEP） on the growth and yield of quinoa at the concentrations of 50， 100， 200 and 350 mg·L^-1， with spraying water as the control. The results showed that the 3 plant growth retarders could effectively reduce the plant height of quinoa， improve the breaking resistance， and reduce the lodging index and lodging rate in a certain concentration range. Among 3 plant growth retarders， the treatment of S3307 was optimum with concentration 100 mg·L^-1， whose plant height decreased by 6.8% and 4.2% and the flexural resistance increased 17.4% and 25.2%， respectively， compared to PP333 and MEP with same concentration. When the concentration of PP333 was 100 mg·L^-1， the anti-lodging ability was better than other concentrations， and the lodging rate significantly reduced by 79.9% compared with CK. The MEP concentration in the range from 100 to 200 mg·L^-1 was more effective than other concentrations. The above results provided theoretical reference for chemical control measures of high-quality planting of quinoa.

Key words: quinoa （Chenopodium quinoa Willd.）, paclobutrazol, uniconazole, mepiquat-chloride, lodging resistance, yield

摘要：

为提高藜麦抗倒伏性，选出降低藜麦倒伏率的最佳植物生长延缓剂水平，采用随机区组试验，以喷施清水为对照，探究多效唑（PP333）、烯效唑（S3307）和缩节胺（MEP）3种植物生长延缓剂在50、100、200和350 mg·L^-1时对藜麦生长发育及其产量的影响。结果表明，3种植物生长延缓剂都能有效降低藜麦株高，在一定范围内提高抗折力，降低倒伏指数和倒伏率。其中，烯效唑效果最好，以100 mg·L^-1为宜，株高较相同水平的多效唑和缩节胺分别降低6.8%和4.2%，抗折力增加17.4%和25.2%；多效唑在100 mg·L^-1时提高抗倒伏能力效果高于其他处理，倒伏率较CK显著降低79.9%；缩节胺在100~200 mg·L^-1范围内效果较好。以上结果为藜麦优质种植的化控措施提供了理论参考。

关键词: 藜麦, 多效唑, 烯效唑, 缩节胺, 抗倒伏能力, 产量