Sweet potatoes need to be fertilized several times.

Sweet potato is a common crop in daily life, which is deeply loved by people because of its good taste and various eating methods. at present, it is being planted in many areas. how many times does sweet potato have to be fertilized?

First, how many times should sweet potatoes be fertilized?

Sweet potato is fertilized about six times, which are pre-planting, seedling fertilizer, strong vine fertilizer, tuber fertilizer, crack fertilizer and foliar fertilizer. The amount required in each period varies, so it should be decided according to the soil conditions of sweet potato and the growth status of sweet potato seedlings.

Second, how to fertilize sweet potatoes?

1. Make up the sweet potato seedlings within a week after transplanting. At this time, you can open a small hole next to the sweet potato seedlings and put in a small amount of nitrogen fertilizer. Generally, about 3 kilograms of urea fertilizer should be used in one mu of land. This can promote the growth of sweet potato seedlings, but we must pay attention to the dosage, do not cause burning seedlings.

2. About a month after transplanting sweet potato seedlings, the growth enters a rapid period. At this time, topdressing should be carried out in time to promote the vine growth of sweet potato. Generally, 4 to 5 kilograms of ammonium nitrate is applied per mu, and about 100 kilograms of plant ash is used. If the terrain is better and sweet potatoes grow more vigorously, fertilizers can be reduced appropriately.

3. The sweet potato has entered the late growth stage after growing for about three months, which is mainly the growth of the stem. Sweet potato growers all know that the favorite fertilizer of sweet potato is potassium fertilizer, which can promote the expansion of sweet potato stem. Therefore, the main purpose of this period is to apply potash fertilizer. Can choose plant ash, generally one mu of land needs about 150 kilograms of plant ash. After topdressing plant ash, it is best to water in the field, so that the fertility can be better absorbed by sweet potatoes.

4. Foliar fertilizer can be sprayed properly in the late growth stage of sweet potato, which can promote the growth of sweet potato. Foliar fertilizer is generally used like fertilizer, like sandy soil, generally spraying once every two weeks, spraying for a month.