Clay is not the main contradiction, but the main contradiction is that the soil organic matter content is low. To improve the soil with fertilization, it can be operated as long as it is not frozen in the season.

Digging ditches along the crown projection line, with a self-defined width of about 50 cm and a depth of 40-50 cm. Then it is best to fill the ditch with farmyard manure, or you can fill the ditch with leaves and straw and bury it. When these fillers rot, the soil will become fertile and the clay will become loose.