What to Do About Early Bolting in Angelica sinensis? Cause Analysis and Control Methods
When growing cluster-type plants, bolting can occur. Among these, bolting can also occur when growing the common Chinese medicinal herb Angelica sinensis (angelica). If angelica bolts and flowers prematurely, it cannot be used medicinally, causing economic losses to farmers. So what are the causes of early bolting in angelica? How can it be well controlled?
1. What are the causes of early bolting in angelica?
1. Improper cultivation
One possible cause of early bolting in angelica is sowing too early, which leads to a higher early-bolting rate. Excessive sowing density can also cause early bolting, and transplanting too early very easily leads to bolting. Applying too much flower fertilizer markedly raises the bolting rate of the plants, and phosphate fertilizer has a certain effect on angelica bolting. During the vegetative growth period and under high-temperature, dry climate conditions, the bolting rate of angelica also rises markedly.
2. Ecological factors
One possible cause of early bolting in angelica is the influence of the planting site. When planted on sunny slopes with low altitude and high temperature, drought is easily caused, and at this time early bolting is very easily triggered. When the day length reaches more than 14 hours, its bolting rate reaches a peak. If the angelica you planted shows early bolting, check whether ecological factors are the cause.
3. Nutritional factors
Early bolting in angelica is also related to seedling size and quality. At the same seedling age, the heavier the seedling, the faster its bolting process and the earlier the bolting time. In addition, early bolting is also related to some extent to the nitrogen content and sugar content of the seedlings.
The above 3 points are some of the causes of early bolting in angelica.
2. Control methods for early bolting in angelica
1. Select and keep good seed
Under the same cultivation conditions, the seeds produced by early-bolting and flowering plants generally have early-maturing traits and are prone to bolting and flowering. Therefore, in order to improve seedling quality and reduce the early-bolting rate, in the current three-year-old seed-production field, you must select and collect seeds that are large-rooted, grow vigorously, have a later flowering period, and have moderate, uniform seed maturity (fish-belly white) for raising seedlings.
2. Sow at the right time
When raising seedlings with seeds harvested from three-year-old plants, if the seedling age is greater than 130 days, the early-bolting rate reaches more than 90%; if the seedling age is less than 70 days, early bolting almost never occurs. However, if the seedling age is too young, the seedling root weight is small, the survival rate after transplanting is low, growth is weak, yield is low, and the benefit is poor. To control large seedlings and old seedlings and reduce the rate of early bolting and flowering, the sowing date should be appropriately delayed so that the seedling age is kept within 110 days, inhibiting bolting and flowering.
Editor's reminder: To prevent early bolting in angelica, when planting you should choose good seed and select seeds that are not prone to bolting for planting. At the same time, sow at the right time, control large seedlings and old seedlings, and reduce the rate of early bolting and flowering. The sowing time should be delayed, and the seedling age should be controlled within 110 days and the seedling weight below 40 grams. In the later stage of seedling growth, appropriately increase the application of nitrogen fertilizer to raise the nitrogen content of the plants and lower the sugar content of the plants, inhibiting their bolting and flowering. In addition, sowing density should be controlled when sowing; generally, the seed rate per mu is 6-10 jin, and it should not be too much, so as to avoid excessive density, which very easily causes bolting.
The above are the control methods for early bolting in angelica.
Summary: The above content is the introduction compiled by the editor of Tuliu.com on the causes of early bolting in angelica and its control methods, hoping to help growers in need. This article is compiled from the Internet.