What are the advantages and disadvantages of autumn sowing and spring sowing of American ginseng?

The sowing time of American ginseng is divided into spring sowing and autumn sowing. Because the frost-free period of American ginseng planting areas in China is very different, the sowing time is very long. Sow in autumn from September to June165438+1October, and there is plenty of time until it is frozen; Spring sowing should be carried out after thawing in March-April, preferably after local late frost and before emergence in April, and the time is short. If the young roots are sown again, there is a danger of damaging the roots. North China is dry in winter, so pay attention to moistureproof when sowing in autumn. The moisture is not good, and the emergence rate is low in the second year. Seeds sown in spring should be well kept, and can be placed in the shade to let them pass through natural low temperature; If the embryo does not develop well and the cleavage rate is not high, it can be placed in a warmer place to let the embryo continue to develop. Whether it is placed in a cool place or in a sunny place, it is necessary to prevent freezing in cold days and melting in warm days, which is easy to damage seeds due to melting and freezing.

The advantages of autumn sowing are that the seeds work in a dormant state, which can not be affected by adverse factors, the time from sowing to emergence is long, the soil is well combined, the soil moisture is good, which is conducive to the growth of emergence, and the autumn sowing time is sufficient to ensure the sowing quality. The disadvantage is to prevent drought and cold after sowing, especially in northeast China, the bed surface is easy to harden in spring, which increases the resistance of seedling emergence, and attention should be paid to loosening the bed surface in early spring. The advantage of spring sowing is that it saves the cold protection work after sowing, and the soil is loose and the water is suitable for seedling emergence. However, the spring sowing period is short and the homework is tense. Due to the influence of high temperature, strong sunshine, air drought and spring breeze, young roots are easily damaged, which affects the emergence rate. Under the condition of suitable soil temperature and humidity, the emergence rate of spring sowing is higher than that of autumn sowing.