1. Reason: In order to facilitate watering and hold down the grass in the field, it is necessary to plow a ditch about 20 cm deep between each row of corn. At this time, corn is the key period of root growth and development. In order not to affect the growth of aerial roots of corn, a small share plough should be used when plowing the land, so that the ridge platform area is large and the furrow area is small, which increases the root soil area and plays the role of less root damage, which can make corn get more nutrients and make corn stalks stronger.

2. Method: ridging, that is, the corn grows for about one month. In order to facilitate watering and hold down the grass in the field, it is necessary to plow a ditch about 20 cm deep between each row of corn. At this time, corn is the key period of root growth and development. In order not to affect the growth of aerial roots of corn, a small share plough should be used when plowing the land, so that the ridge platform area is large and the furrow area is small, which increases the root soil area and plays the role of less root damage, which can make corn get more nutrients and make corn stalks stronger. At that time, there were no large livestock, and ridging could only be done by manpower. It is my father who plows the land behind our house, because it is not only a technical job, but also requires hard downward pressure, otherwise the plow can't go on.