The sweet potato is not resistant to earthworms. When the soil moisture content exceeds 90% of the maximum water holding capacity in the field, it cannot grow normally. Once it is damaged, it will have a great impact on the yield and even cause the melon to rot.
The sweet-smelling of sweet potatoes occurs mainly in July and August when rainfall concentrates, or due to the formation of water within the area, or because of the high groundwater level, the soil moisture in the cultivating layer is too large and the waterlogging occurs, or because of water seepage on a terraced land in the hills. Leaked to the next piece of land to form a "half-edge."
To prevent sweet potato damage, we must start from the sweet potato planting, try to choose terrain, high dry, easy to drain the land. In the growing season, damage occurs, drainage and dewatering are promptly performed. The method of drainage must be adapted to local conditions. The hilly terraces should be dug down the trenches, and the depth of the trenches should be 50 to 70 cm deep. In the middle of the ground, dig a good trench, with a trench depth of about 33 cm. Digging a good ground ditch in the ground has a great effect on preventing the “half sideways†of the terraces; on the plains, it is long and short, and the accumulated water after the rain is not easy to discharge in time. Every 8~10 ridges can open a ditch with a ditch depth of 70 cm. ~16 meters to dig a ditch 80 centimeters deep, dig around the ground a 1 meter deep field side ditch, the water into the ditch. After the pest has been harmed, the vines, cultivators, and weeds must be promptly applied. When necessary, foliar sprays are applied to supplement the plant nutrients, and the sludge remaining on the surface of the plants is washed away to promote photosynthesis.
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