Can the end of the planting of cotton be earlier? According to the practice of cotton sowing for many years, the lessons in this area are very profound. In fact, the use of plastic film to cover the cultivation of seedlings can also be planted in the middle and late March to cultivate cotton seedlings in early April. There have also been large-scale production demonstrations, but the result is difficult to manage and it is difficult to ensure Whole seedlings and strong seedlings. First, in the middle and early April, the cold wave was frequent, the temperature varied greatly, and the number of visits from the north wind was quite high. The uncovering of the seedbed film was very difficult to grasp. Second, in case of continuous rainy weather, the cotton seedlings on the seedbed were difficult to ventilate and breathe. Easily form line seedlings, resulting in lodging of cotton seedlings; Third, low temperature and rain is also easy to induce legume, anthrax, tripping and other diseases, resulting in seedbed into dead seedlings; Fourth, early sowing, so that the age of cotton seedlings, forcing cotton seedlings Early transplanting to Daejeon, early planted cotton seedlings hit a cold wave, often due to dead seedlings caused by lack of seedlings off ridge, the general lack of seedlings 10% to 20%, severe seedlings 30% to 50%. In recent years, many new varieties have been introduced in cotton production, especially hybrid hybrid insect-resistant cotton, which is more expensive. If the shortage of seedlings is too large, it will cause economic losses, and it will be difficult for cotton to be planted once, transplanted once, or once in full. The planned area of ​​cotton fields will often be frustrated, and it will be even more difficult to ensure that good cotton species will seize high-yield bumper crops.
Faced with the emergence of warm winter climate, what choices should be made in the sowing of fine cotton seeds? According to many years of experience, in order to prevent or reduce the loss of good cotton varieties, the following aspects should be emphasized in the technology of transplanting seedlings for nutrition.
Understand the temperature requirements of cotton emergence According to research, the minimum temperature of the seed germination is 10.5 °C, the temperature of the seedling is above 12 °C, the accumulated temperature of the seedling and seedling is 80 °C ~ 100 °C, and the temperature can meet the requirement of germination. .
Understand the local climate rule In the middle reaches of the Yangtze River, for example, the average temperature in late March is above 9°C, the average temperature in early April is above 13°C, and the average temperature in mid-April is above 16°C. Therefore, it is possible to broadcast in early April. In the middle of this year, we can focus our time and focus on the labor assault. The sowing is more reliable during this period.
To achieve safe and proper transplanting of young seedlings, transplanting cotton seedlings from the end of late April to early May, or transplanting three true leaves of cotton seedlings, is safer, because the young stems begin to lignify at this time. Increased resistance to stress. From the intrinsic experience, it is called "time to seedlings, seedlings to unequal hours."
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