What causes uneven corn seedlings?
Corn is a very popular food crop in our country. It is grown in most parts of our country, but many people often encounter the phenomenon of uneven corn seedlings when growing corn. Uneven corn seedlings can affect the uniformity of corn seedling emergence, which is very unfavorable to corn yield and growers' planting benefits. So what causes uneven corn seedlings? Below, the editor will introduce it to everyone. Let's take a look!
1. Uneven soil moisture
When planting corn, if the weather is too dry and the soil lacks water, then the soil moisture will be uneven, so that in places with better soil moisture, seedling emergence is good and the time is earlier. On the contrary, in places with poorer soil moisture, corn seedling emergence is not very ideal. Naturally, the phenomenon of uneven seedlings appears. Therefore, after sowing, we should pay attention to maintaining uniform soil moisture in the field. When sowing, appropriately water once with bottom moisture water, or water thoroughly after sowing, mainly with shallow irrigation, and keep irrigation uniform.
2. Unsuitable sowing depth
Before sowing corn, if the quality of land preparation is relatively poor, it will cause the soil to be uneven. Then when mechanical sowing is carried out, it will cause deeper sowing in high places and shallow sowing in low places, resulting in inconsistent sowing depth of corn seeds. Under the condition that the soil moisture is equally good, seeds sown shallower emerge early and quickly, while seeds sown deeper are the opposite and emerge later. However, if the soil is too dry, the two situations will be reversed, but if reversed, the phenomenon of uneven seedlings will still appear. Therefore, after sowing, we should pay attention to doing a good job of compaction, ensure the soil is level during land preparation, and control the sowing depth of each seed.
3. Seed problems
Seed problems are also a main problem causing uneven corn seedlings. The quality of corn seeds has a direct impact on corn emergence speed and seedling quality. Before sowing, if we do not grade the seeds and thus the seeds are of different sizes, large seeds emerge early, while small seeds emerge late and form weak seedlings, causing uneven seedlings to appear at the corn seedling stage. In addition, if the seeds are damaged, they are highly susceptible to harm from pathogens, reducing their growth and development speed, and are likely to form weak and small seedlings, thus causing the phenomenon of uneven seedlings. Therefore, when purchasing seeds, we must pay attention to maintaining good seed uniformity and must not select damaged seeds.
4. Thinning and final singling too late
After corn emerges, in order to ensure sufficient growth space for the seedlings, we should do a good job of thinning and final singling. Ensure that each seedling grows normally and does not compete with each other for fertilizer and water. The timing of thinning and final singling is very important. Thinning should generally be carried out when corn seedlings grow to about 3 leaves, because at the 3-leaf stage the corn seedling is in a “weaning period”, and at this time the demand for light is relatively large. If thinning and final singling are too late, the impact on them is very great, and the phenomenon of uneven seedlings is very likely to appear.
The above is a brief introduction to what causes uneven corn seedlings. That is all for today's introduction. This article is for reference only, and I hope it can help everyone!