In the cotton seedling stage, field management should be strengthened. The main target is to ensure the whole seedling, to achieve strong seedling early development, prevent pests and diseases, and lay a good foundation for early buds and multiple buds.
First, catch the whole seedling
In the absence of seedlings, measures should be taken as soon as possible: the seedlings that are simultaneously sown at the same time should be moved into the seedlings as soon as possible. The earlier the seedlings are, the shorter the seedling period will be, and the faster the normal growth will be, the smaller the difference with other seedlings will be. When there is no seedling, the extra seedlings should be moved as much as possible. The sooner the better. If there is no seedling preparation, there is no extra seedling between rows and there are more seedlings, and the seed should be replanted as soon as possible. For the seedlings or replanting of the lack of seedlings, it should be appropriately sparse, so that there is a lack of 2 supplements, a lack of 3 supplements 2, and a lack of 4 supplements.
Second, cultivating loose soil
The cultivating loose soil can eliminate the knot formed by mechanical walking and personnel trampling during sowing, which can reduce the soil moisture and reduce the seedling disease, and can improve the ground temperature to promote the early development of cotton seedlings. After each rainfall, the soil should be ploughed in a timely manner to keep the soil loose, soil temperature, air, moisture and nutrients are well regulated, and the root system grows fast, the depth of the tie is wide, and the distribution is wide, so that the seedlings grow early. The depth of cultivating in the open field is 8-10cm, and the ground is kept free of weeds, non-consolidated, and loose topsoil.
Third, early prevention
The diseases that occur before the cotton buds are collectively referred to as seedling diseases. During this period, the nutrient area is small and the root system is still underdeveloped. In the case of low temperature and rainy weather, the pathogens are highly susceptible to infection, and the light cotton seedlings are weak and weak. Large area of ​​dead seedlings. From the past years, the disease is most prominent, such as blight, anthracnose, red rot, etc. These diseases have early onset, rapid spread, and serious damage, and must be highly prevented. In the prevention of disease prevention, it is necessary to highlight an "early" word and a "defense" word. If you wait until the disease is cured, it will increase the cost of prevention, labor, labor, and premature aging, affecting the final output. Spray three or less leaves before not less than two times. The first time is to spray 80% allicin in the seedlings, to spray 2000 times solution, and the second time in 1-2 leaves. 70% carbendazim 3500 times liquid spray. When the temperature changes greatly, the medicinal and strong seedlings should be sprayed, such as Tianfengsu, Shuofeng 481, Fengyuesu, Tianda 2116 Zhuangmiaoling, Fu Shizhuang, etc.
Fourth, early treatment of insects
The cotton seedlings are more serious, mainly including thrips, blind mites, locusts, tigers, red spiders, etc. Different pests have different time and harm modes, which have a greater impact on the growth of cotton seedlings. Come to a certain level of difficulty. Regardless of which kind of pests should be highly valued for prevention and control, cotton aphids, small thrips, blind mites, and red spiders can be sprayed with 50% anti-Citrus WP 1000 times or 10% imidacloprid 2000 times. When controlling the young larvae of the ground tiger, it can be sprayed with 20% speed killing 1500-2000 times liquid or 50% phoxim 1500 times liquid. If you control the older larvae of the tiger, you can use the bait insecticide method: 5 kg of sauteed wheat bran or cotton kernel cake, add 1 kg of water with 50% phoxim 50 ml, spray evenly, and sprinkle into the rows in the evening.
Five, eliminate large and small seedlings
As the saying goes, the big seedlings bully seedlings, the seedlings do not bear peaches, which means that the large seedlings are large, have strong glory and strive for nutritional advantages, while the weak seedlings are under inferior conditions, the more passive, the bigger the gap is, the more the difference The population structure does not achieve the desired yield. Therefore, in the management of cotton fields, it is necessary to apply eccentric fertilizer to the seedlings early, and use 0.5%-1.0% urea aqueous solution to irrigate the roots (low concentration when the seedlings are small) by putting the solution into the sprayer and removing the nozzle from the flow. 150-200 ml per solution can be used.
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