The seedling period of the yam is generally from April to May. At this time, the temperature is not very high, which is conducive to the growth of seedlings. At the same time, the light is also sufficient, and the temperature is between 15-20 ℃. If the climate is different, the seedling time can also be delayed.
1. Selection of seed potatoes: yam seldom propagates with seeds, but chooses seed potatoes, that is, its massive roots. Select some kinds of potatoes that are free of diseases and insect pests and have no damage on the surface, and the weight is between 100-250g.
2. Planting: yam is generally planted on a large scale, and the distance between each potato is about 3cm. Arrange them and cover them with a layer of soil of 2-3cm. The soil should not be too thick, so as not to affect the emergence.
3. Heat preservation measures: according to the different varieties of yam, the heat preservation measures are also different. The early varieties use three layers of heat preservation: big shed, small arch shed and plastic film, while the conventional varieties use two layers of small arch shed and plastic film. After emergence, the mulch should be removed to avoid affecting the growth of seedlings.
4. Keep the ventilation: when the temperature is above 20 ℃, strengthen the ventilation of the shed to avoid too high temperature and burn the seedlings. At the same time, after the soil is dry, water it in time to ensure the humidity of the environment.
