How to prevent the deformity of yam?

How to prevent the deformity of yam? Please give guidance in the process of cultivation, due to adverse environmental conditions, cultivation measures, management methods and other factors, the internal organizational structure of Chinese yam has changed in the process of growth, resulting in a variety of strange shapes, such as the decentralization of the upper end of the yam tuber, the lower end, the serpentine shape, the flat head shape, the foot shape, the gourd shape, the hemp face shape and so on. Preventive measures are as follows: 1. Remove foreign bodies in the ditch. Manual digging of yam ditch should be carried out before winter, and the soil should be fully weathered and smashed by freezing and weathering in winter and spring, thawing with the wind and filling the ditch. When filling the ditch, carefully remove the stones, bricks, gravel and other hard objects in the upper soil, and do not fill large blocks of soil into the ditch. 2. Planting according to technical regulations. If the seed fertilizer is not applied in the planting ditch, the dosage should not be blindly increased when applying poisonous soil and bait to control underground pests. 800 times liquid of new high fat film can be used to spray soil surface, reduce chemical dosage, keep heat and prevent freezing, prevent soil layer hardening, suffocate and isolate the source of diseases and insect pests. 3. The application of fully mature organic manure, such as human feces and urine, compost, barnyard manure and high-quality soil manure, should be retted in advance by taking advantage of the favorable opportunity of high temperature and easy fermentation in summer and autumn. When the leaves began to expand, the herbal medicine Root Daling was sprayed on the leaves. The leaf photosynthesis products (nutrients) were transported to the root system, the nutrient conversion rate and soil loosening ability were improved, the rhizome was expanded rapidly, and the medicinal content was greatly increased. Click to get more yam planting techniques click to get more vegetable planting techniques