The primary risk factor for single seedlings is emergence.
There are four major factors that limit corn emergence:
One, the species itself
Second, the planting environment
Third, the seed quality
Fourth, sowing quality
I. Varieties themselves: Due to the genetic factors of cultivars, the cultivars themselves have poor vigor, poor top soil strength, or poor resistance at seedling stage, resulting in poor emergence of the varieties themselves. Especially in adverse circumstances, such as low temperature, drought and other seedlings are even worse.
Second, the planting environment
1, the seed germination process in the low temperature
2. Drought in the process of seed germination
3, watering caused by poor seedlings
4, chemical fertilizers cause poor seedlings
5, the impact of injury caused by yellow leaves
6, insect damage caused by poor
7, disease caused by poor seedlings
Third, the quality of the variety, due to poor quality or low vitality caused by poor seedlings.
Fourth, the quality of seeding caused poor seedlings
1. Sowing date: China's corn planting area has a large span, and sowing seasons vary greatly. For example, in the broadcast area of ​​Beijing, Tianjin, Tangchun and Spring sowing areas, in order to avoid “kabikozi droughtâ€, they are generally sowed in late spring in mid-May; in southwestern corn areas, transplanting seedlings is locally transplanted. In order to avoid high temperature and more early sowing habits in most regions, the seeds are prone to freeze damage. Early Spring and Early Spring sowing area in the East China and North China adopts the grab-collecting temperature to rob and sow seeding; in the late spring sowing area of ​​northeastern corn, the sowing time varies greatly. From late April to mid-May, the span is up to one month. Early precociousness is prone to frost damage, and the latter part is late. The land lost in the broadcast is fast and vulnerable to drought. So timely sowing of any variety in the sowing season is extremely important.
2. The level of soil preparation and extensive soil preparation have a great influence on the emergence of corn. Therefore, the promotion of fine sowing must be fully successful in areas with high levels of cultivation techniques or by demonstrations to promote the overall planting level of farmers.
3, sowing too deep, causing uneven seedlings
4, missing when sowing
5, multicast when sowing
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