Common Mistakes of Cotton Seedling and Countermeasures

When investigating the preparation of cotton seedlings in the field recently, some farmers asked the following questions: Different varieties of cotton seeds were planted on the same seedbed. Some seedlings were seeded quickly, some were seedlings slowly, and seeds with slow seedlings were of poor quality? Why do some of the same varieties of cotton seeds emerge early and some have emerged late? Why do we die after weaving cotton seeds? Why are there deformed cotton seedlings? Answer one by one now.

1. Seedlings of different varieties of cotton seeds are sown sooner or later on the same seedbed and often appear in production, and it cannot be concluded that the seed quality of late varieties is poor. This is because the sowing of different cultivars to emergence requires different requirements for the cumulative accumulated temperature (equal to or greater than the cumulative average daily temperature over the duration of 10°C). Some varieties can emerge when the accumulated temperature reaches 80°C. It is required that the accumulated temperature reaches 100°C to emerge. In addition, there are differences in the thickness of shells of different varieties of cotton, and there are differences in the rate of water absorption. Different varieties of cotton seeds are best not to sow in the same seedbed so that whole seedlings can be broadcast.

2. The emergence of seedlings of the same variety of cotton seedlings in the same seedbed is good or bad, which is related to the degree of moisture in the nutritious bauxite before and after sowing. In general, watering is more adequate, and seedlings that meet the water requirement for germination of cotton seedlings are better, while watering on the same seedbed is uneven, and emergence is very different. In the watering seedbeds, seedlings often appear on both sides of the shed film, and the seedlings in the middle are poor. This is because the water vapor on the shed film condenses into water droplets and flows into the nutritional bowls on both sides along the shed film, so that this part of the cotton seedlings absorbs more water, while the nutrient pod in the middle of the seedbed absorbs less water. Therefore, after seeding, the seedbed should be filled with water once, and the seedlings should be promoted. The seedlings should not be peeled off without opening the plastic film.

3. There are usually three reasons why rotten species are found in cotton seedbeds. First, the quality of seeds is not high, especially after breaking seeds and tender seeds sowing rotten species; Second, the use of urea as a base fertilizer, germination of seeds germinate after the seeds are easy to burn bad; Third, excessive watering. The causes of dead seedlings in seedbeds are mainly physiological disorders, high fertilizer concentrations, pathogen infestation, low-temperature chilling injury, and high-temperature heat damage, which must be specifically analyzed based on actual conditions. To prevent the death of cotton seedlings, the first one is to buy cotton seed with high germination rate, and remove the broken seeds and tender seeds; the second is to use decomposed organic fertilizer or moderate amount of compound fertilizer as the base fertilizer, and no urea can be used; third, the water management should be moderate; The fourth is to do a good job in the disinfection of rammed earth and cover seed soil; Fifth, the fungus should be sprayed immediately after the cotyledon of the cotton seedlings is developed to prevent the invasion of bacteria.

4. The malformed seedlings often appear in cotton seedlings are shelled seedlings, apical seedlings, fat foot seedlings, and contract leaf seedlings. The shelled seedlings are generally water-deficient, and the cotyledons fail to fully expand and disintegrate the cotton husks. After the water is added, the cotyledons can be unrolled and stretched. Apical seedlings are caused by too thin soil after sowing, and usually a thickness of 1.5 cm can be avoided. The fat footed seedlings are caused by overburdened soil after sowing. The seedlings concentrate the nutrients to the base of the young shoots in order to unearth the soil, so that the young shoots are hypertrophied and can be avoided as long as the earth cover thickness is moderate. In addition to leaf aphid damage caused by aphids, it is generally the performance of true leaf freeze, seedlings after the Qichao encounter early to cover the strict membrane.