1. Sowing too early and too deep. The emergence time is longer. In case of bad weather such as short-term freezing damage or low temperature for a long time, the seed's own immune function is reduced, the ability to resist viruses is weak, and rotten roots and yellow buds are caused by virus infection.
2, the isolation of fertilizer is not good. The seed embryo germinates to expose the radicle, and then the germ is released, which is in contact with the fertilizer, destroying the embryo tissue and causing decay.
3. Related to the nature of the plot. Generally, it is heavier in low-lying areas, and the land or sunny slope is lighter.
4. It is related to the type of seed coating. Improper use of the seed coating or excessive coating time can cause this phenomenon.
5. It is related to moisture, temperature and oxygen. When the soil moisture is 70%, the emergence is fast and the emergence rate is high. When the soil moisture is more than 80%, the soil moisture is too much, the air is insufficient, and it is easy to rot, which affects the emergence of seedlings. Corn seeds generally start to germinate at 12-15 °C, but the germination is very slow, easy to be infected by pathogens, and even rotten seedlings lack of seedlings; germination is more suitable at 20 °C, the fastest germination at 25-35 °C, more than 40 °C Not conducive to germination. Oxygen is a necessary condition for seed germination. If the soil is too wet, or the planting is too deep, or the soil is stagnant after sowing, it will cause insufficient oxygen, prolong the emergence time, consume more nutrients, and the seedlings are thin.
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