How to grow Angelica dahurica to reduce bolting and achieve high yields

In production, some Angelica dahurica plants often bolt and flower prematurely in the second year, generally 10%-30%, and in some cases more than 50%, seriously affecting yield and quality. There are many factors that cause bolting and flowering in Angelica dahurica. In view of bolting in Angelica dahurica, the following measures are mainly taken: according to the characteristic of Angelica dahurica of bolting early, measures such as controlling the sowing period, fertilizer and water management, and seed selection are adopted to control seedling growth, so that the seedlings before overwintering will not grow too large or too small, thereby reducing the bolting rate of Angelica dahurica.

1. Reasonable pruning and breeding of good seed: according to the effect of Angelica dahurica seeds on bolting, during the flowering period of the plants, reasonably trim the seed-bearing Angelica dahurica, cut off the main stem and the inflorescences on the secondary and tertiary branches, and retain the inflorescences on the primary branches, thereby ensuring the nutrient supply of the primary branch inflorescences, making the embryo development mature and consistent, and narrowing the individual differences of the seeds. In this way, after sowing, the seedlings emerge neatly, which is convenient for management, and the plants also have excellent traits.

2. Timely sowing: the early or late sowing period affects the growth of seedlings. Different regions should, according to the actual local conditions, choose a sowing period suitable for the local climate conditions and soil conditions.

3. Control water and fertilizer: strictly control the supply of fertilizer and water before spring, generally apply little or no fertilizer; after thinning to a stand in early to mid-April, the plants enter the vigorous vegetative growth stage. To meet the needs of rapid growth, fertilization is needed at this time. Different types of fertilizer and application methods have a relatively large impact on the early bolting rate of Angelica dahurica. For example, if potassium fertilizer is applied alone, the early bolting rate of Angelica dahurica is low, and potassium has a certain controlling effect on early bolting of Angelica dahurica; if nitrogen fertilizer or phosphate fertilizer is applied alone, it promotes early bolting; among different nitrogen application ratios, when phosphate and potassium fertilizers are all used as base fertilizer, the yield is low and the early bolting rate is high; when half of the phosphate and potassium fertilizers are used as base fertilizer and half as topdressing, the yield of Angelica dahurica is relatively high and the early bolting rate is low.