What causes large and small cotton seedlings

Cotton is a plant in the Malvaceae family, and it has a very large planting area in China, which is also one of the countries with the highest cotton yields. As the main raw material for most cotton products, cotton is a very important crop. So more and more people are growing cotton, but many people find that cotton often shows the phenomenon of large and small seedlings when growing it. So how are large and small cotton seedlings caused? Let us take a look below!

1. Temperature and humidity reasons

Professional surveys have found that when growing cotton, the cotton in the middle of the plastic mulch grows far better than the cotton on both sides. This is because the temperature in the middle of the mulch is about three degrees higher than on both sides. So temperature is the main factor causing large and small cotton seedlings. Then there is humidity. If watering is improper, especially when there is a lot of rain, the humidity in the cotton field is uneven, which easily forms uneven soil moisture, and combined with uneven temperature, this naturally causes the phenomenon of large and small cotton seedlings. Therefore we must pay attention to controlling temperature and humidity well, especially after sowing, maintaining consistent soil moisture and improving the uniformity of cotton seedlings.

2. Improper mulching

When growing cotton, we need to mulch appropriately, and mulching after planting is a key measure to ensure normal cotton growth and yield. After cotton sowing, if the plastic mulch is not covered firmly, causing air leakage, and then windy or strongly windy conditions occur, the mulch cannot play a balanced heat-preservation role for cotton seeds and seedlings. Where the plastic mulch is properly covered, because of heat and moisture preservation, the seedlings emerge relatively quickly. On the contrary, if mulching is improper, it will have a great impact on the growth of cotton seedlings, thus causing the phenomenon of large and small seedlings, so everyone must pay close attention.

3. Too much residual film

Too much residual film in the cotton field is also a main reason causing large and small cotton seedlings. When growing cotton, if plastic film planting is carried out year after year for many years, then too much plastic film will accumulate in the plow layer of the cotton field, causing great obstruction to the germination and emergence of cotton seeds. According to survey findings, residual film in the plow layer affects at least 5% of the emergence rate of cotton seeds. If seeds are sown on residual film, or are covered by residual film, because soil permeability is too poor, this causes slow emergence, no emergence, or even dead seedlings.

4. Seed and sowing reasons

Before sowing, we must strictly select cotton seeds. If seed quality is too poor, or if the seeds have not been treated by sunning and disinfection, it will affect the overall quality of the seeds. Unhealthy and shriveled seeds emerge slowly, and their seedling growth ability is also very poor, so they will naturally contrast with healthy seeds. Moreover, when sowing, if the land preparation work is not done well, resulting in inconsistent sowing depth, then the emergence time of cotton seeds will naturally differ. In addition, scattered seeds, soil covering thickness, and so on can also easily cause the phenomenon of large and small cotton seedlings.

The above is a brief introduction to how large and small cotton seedlings are caused. That is all for today's introduction. This article is for reference only, and I hope it can help everyone!