Corn hi warm light. The minimum temperature for corn seed germination is 6°C~7°C, but the germination rate is extremely slow, and it is susceptible to rot by bacteria and fungi in the soil. In some places, in order to avoid the impact of drought and pollination caused by the hot season, sowing early in the spring, due to low soil temperature, seasonal temperature is not yet stable, it often takes 20 days from sowing to emergence, in the event of rain or cold , Often caused by seedlings or rotten seed. Corn seeds germinate quickly and neatly at temperatures between 10°C and 12°C, and this temperature is used as the lowest temperature indicator for seeding.
Maize seedlings have stronger resistance to low temperature than late growth. In case of 0 °C low temperature will not freeze to death, in the short-term temperature of -2 °C ~ -3 °C, the seedlings will be damaged, if the temperature rises quickly, timely management, seedlings can be restored to normal growth in a few days. If the cold conditions continue for a long time, the seedlings will freeze to death. When corn grows 4~5 leaves, it can still resist slight frost
After freezing, the cold resistance gradually decreased. The reason that the low temperature causes the seedling to grow slowly is that the root metabolism is slowed down. When the temperature drops to 4°C~5°C, the root system completely stops growing. In the management of agricultural production, adopting ridging sowing to increase the area of ​​solar radiation or using plastic film to cover and increase the soil temperature is of great benefit to the promotion of root development.
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