Corn is not conducive to seedling emergence at low temperature, and sometimes it will cause freezing injury. Greenhouse planting can adjust the temperature, which is beneficial to the emergence and growth of corn. Under other suitable conditions, the germination and emergence of maize mainly depend on the environmental temperature. When water and oxygen are suitable, the higher the temperature, the faster the germination and emergence.
Greenhouse planting can adjust water and sunshine, and maize germination and growth need suitable water. The sunshine hours in the whole growth period of maize have a certain influence on the growth period. The growth period of the south-transplanted species is prolonged, and the growth period of the north-transplanted species is shortened. The growing season in northern China is short, and the southern varieties are moved to the north for planting, which is generally not suitable for late sowing.
Extended data
Matters needing attention in corn sowing:
1, carefully select corn seeds before sowing, remove flat grains and large grains, and make the seeds as uniform as possible. ?
2. According to the ground temperature, seeds can be sown when the lowest temperature of 5- 10 cm soil layer stably passes through 10℃. Early sowing prolongs the seedling stage, resulting in weak seedlings and late sowing, which affects the maturity of corn.
3. In spring, there is little rainfall and strong wind, so it is easy to run. It is necessary to master the appropriate sowing depth according to the soil moisture. If it is too deep, it will be difficult to germinate when it encounters low temperature and soil hardening. If it is too shallow, if it encounters drought and the soil moisture is poor, the seeds will not absorb enough water and cannot germinate and germinate. The general sowing depth is 4-6㎝.
4, after sowing to suppress in time, the soil is too weak. One is serious, and the other is that it will cause weak seedlings.
Baidu encyclopedia-corn