During the cultivation process, due to adverse environmental conditions, cultivation measures, management methods and other factors, yam caused changes in the internal structure of yam during the growth process, resulting in all kinds of strange shapes, such as the decentralization of the upper end of the yam tubers and the decentralization of the lower end. Snake-shaped, flat-headed, foot-shaped, gourd-shaped, hemp-shaped, etc. These are collectively referred to as deformed yam. The preventive measures are as follows:
1, remove the foreign material in the trench. When artificially digging the yam ditch, it should be carried out before winter, and the weathering of the winter and spring snow erosion will make the lumps fully weathered and crushed. With weathering and thawing, it will be filled with ditch. When the ditch is filled, rocks, bricks and gravel in the upper soil are carefully removed. For hard objects, do not fill large blocks into the ditch.
2. Plant according to technical regulations. Do not apply seed fertilizer in planting trenches, and do not blindly increase the dose when controlling poisonous soils and baits used by underground pests. It is possible to spray 800 times of new high-fat membranes on the surface of the soil to reduce the dosage, prevent freezing, prevent soil compaction, suffocation and isolation diseases. Insect source.
3, the application of adequate decomposition of organic fertilizers, such as human waste, compost, manure and high-quality soil miscellaneous fertilizer, to take advantage of the high temperatures in summer and autumn, easy to ferment and decompose the favorable opportunity in advance tanning. When the leaves began to expand, the herb was sprayed on the foliar roots. Foliar photosynthetic products (nutritions) are transported to the root system to increase the nutrient conversion rate and ripping ability, so that the rootstock rapidly expands and the medicinal content is greatly increased. (Rain)
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