From late August to early October, it is the root-expansion period of sweet potato in spring and summer. This period is the key period for the formation of yield, and it is the most demanding period of fertilizer. The following topdressing method can be used for topdressing.

First,…

Gu Yu, pointing fingers. Yellow sun is 15 degrees. On the April 20th of the Gregorian calendar each year, it is raining on the valley. Gu Yu has the meaning of "rain and water has 100 valleys." It is the sixth solar term in the twenty-four solar terms and…