白芷早期抽苔,易使根茎木质化,粘性差,质量下降。近年来由于忽视栽培管理措施,致使白芷早期抽苔严重,约占种植面积15—20％,多者达30％以上。我们从1979年开始先后在禹县、长葛、鄢陵等县进行36次,共计643.2亩的观察试验研究,基本掌握了控制白花早期抽苔的措施,83—84年推广播种1110亩,结果抽苔率仅为3—5％,平均每亩增收50公斤。现总结如下。一、适时播种试验证明,白芷的最适播种期在白露后5—10天内(9月10日左右)。即冬前苗龄为92天左右,幼苗生长4—6片真叶,则抽苔率不超过3—5％,死亡率为1—2％。在这 Angelica early bolting, easy to rhizome lignification, poor viscosity, quality decline. In recent years due to neglect of cultivation management measures, causing Angelica early bolting serious, accounting for about 15-20% of the acreage, more than 30%. Since 1979, we have carried out 36 observation missions in Yu County, Changge County and Yanling County for a total of 643.2 mu. We have basically mastered the measures for controlling early bolting of white flowers and 1110 mu of seeding crops in 1983-84. The rate is only 3-5%, with an average yield of 50 kg / mu. Now summarized as follows. A timely sowing test proved that the optimum sowing date of Angelica dahurica within 5-10 days after bleaching (about September 10). That is, about 92 days before winter seedling age, seedlings grow 4-6 true leaves, the moss rate of not more than 3-5%, the mortality rate of 1-2%. At this