What happens when corn is planted too early? How to determine the sowing time in the north?

What happens when corn is planted too early? How to determine the sowing time in the north?

Harm of early sowing

Cause disease. In recent years, farmers generally plant corn in advance. Take our place as an example. After Tomb-Sweeping Day, some farmers began to sow corn. Blindly sowing early will make corn seeds stay in the soil for too long, easily infected with bacteria, and cause many diseases and insect pests of corn. Moldy seeds. The sowing time of corn is too early, the soil temperature is too low, and the seeds can not germinate in time, which is easy to cause mildew, rot, lack of seedlings and ridge cutting. As a result, corn yield decreased. The economic benefit is reduced.

Frostbite happened. Corn was sown too early, especially after Tomb-Sweeping Day this year. It's been more than half a month now. It should have been unearthed. But last night, the temperature plummeted, and the flower buds of walnuts, apples and hawthorn were frozen to death. Can the newly unearthed corn buds withstand freezing injury? It is impossible to recover from minor frostbite and replant severe frostbite.

How to determine the sowing date of northern corn;

In fact, the sowing date of spring corn is affected by temperature. The determination of sowing date should also be combined with the local climate characteristics. For example, the temperature rises rapidly in warm areas in spring, and the sowing time will be advanced. For example, in northern China, the temperature rises slowly in spring, the frost period is long, and the temperature fluctuates from high to low. The sowing date of corn is also late, which is only a matter of time. However, whether in the north or other warmer areas, as long as the local temperature is stable and exceeds 10℃, spring corn can be sown, which is the suitable sowing date of corn. For example, in Tianshui City, northwest Gansu Province, sowing is usually in the middle and late April, that is, around the "Grain Rain" solar term.

Matters needing attention in sowing date of northern spring corn:

As far as sowing date is concerned, film-covered corn can be appropriately advanced by 2-3 days, but not too early to prevent freezing after early emergence. According to the growth period of maize varieties, late-maturing varieties can be sown in advance, and middle-early-maturing varieties can be sown late, but not too late. To ensure the whole seedling, sow 2 seeds per hole, and then pay attention to the sowing depth, that is, 3 ~ 5 cm. At the same time, we should pay attention to areas with poor soil moisture, little rain and windy spring. After sowing, the soil should be properly covered and thick to prevent it from being blown dry by the wind and reduce the emergence rate.