Management techniques of Cotton Seedling stage

Cotton is one of the most important crops in the world. To grow cotton with high yield and good planting is the foundation, and good management is the key. It is necessary to protect the whole seedling, prevent disease seedlings, promote strong seedlings and strengthen field management, so as to lay a good foundation for early budding and multiple budding. Cotton seedling stage refers to the period from emergence to budding, mainly vegetative growth, that is, the growth of roots, stems and leaves. The main goal is to ensure the whole seedling, to achieve the early development of strong seedlings, and to lay the foundation for high yield.

Catch the whole seedling

Measures should be taken as soon as possible where there is a lack of seedlings, and the prepared seedlings sown at the same time should be transferred to the place of lack of seedlings as soon as possible. The earlier the seedlings are transferred, the shorter the seedling stage is, the faster the normal growth is, and the more the difference between the seedlings and other seedlings can be reduced. When there are no prepared seedlings, extra seedlings should be transferred as much as possible, and the sooner the better. If there are no prepared seedlings, no extra seedlings between rows and lack of seedlings, they should be replanted as soon as possible. The transplanting or replanting of the missing seedlings should be sparse properly, so that the deficiency should be 2 to 1, 3 to 2, and 4 to 3.

Ploughing and loosening the soil

Early ploughing and loosening soil in the open field can eliminate the hardening caused by mechanical walking and human trampling during sowing, reduce soil moisture, reduce seedling diseases, increase soil temperature and promote the early development of cotton seedlings. The soil should be ploughed and loosened at the right time after each rainfall, so that the soil temperature, air, water and nutrients can be well adjusted, and the root system can grow fast, deep and widely distributed, and become a developed root system. enhance the ability to absorb water and nutrients and resist adverse external conditions to achieve early emergence of strong seedlings. The depth of ploughing in the open field should be 8cm to 10cm, and the number of ploughing should not be too frequent, so as to keep the ground free of weeds, non-consolidation and loose topsoil.

Early prevention of disease

The diseases of cotton before budding are collectively referred to as seedling diseases, during this period, the nutritional area is small, and the root system is not well developed. in low temperature, overcast and rainy weather, the pathogen is very easy to infect, the growth of cotton seedlings is weak, and the heavy ones cause a large area of dead seedlings. From the point of view of the incidence, blight, anthrax and red rot are the most prominent. These diseases have early onset, rapid spread and serious harm, and must be highly prevented. In the prevention of seedling diseases, we should highlight the word "early" and the word "prevention". The so-called early, is before the disease before the implementation of spraying. The word "prevention" is the first to reflect the prevention of disease does not see the disease, it is necessary to have a sense of prevention in order to reflect the initiative in the word "early". If you wait until you see the disease and treat the disease, it will increase the cost of prevention and control, more labor, more weak seedlings, easy premature senescence, and affect the final yield. Spray not less than twice before the three true leaves, the first time is to spray 2000 times of allicin when the seedlings are full, and the second time is to spray 3500 times of 70% carbendazim during the period of 1 to 2 true leaves. When the temperature changes greatly, nutritious and strong seedlings should be sprayed, such as Tianfeng Su, Shuofeng 481Fengshou Su, Tianda 2116 Zhuang Miaoling, Fushi Zhuang and so on.

Early pest control

Cotton seedling pest is more serious, different damage time and damage mode, have a great impact on the growth of cotton seedlings, but also bring a certain degree of difficulty to field control. With the occurrence of insect pests, some spread viruses, some affect the postponement of cotton growth, some lose their growth points into male cotton, or break their stems, resulting in headless trees. Cotton aphids, thrips, blind bugs and red spiders can be sprayed with 1000 times of aldicarb wettable powder or 2000 times of imidacloprid. Ground tiger larvae can use poison bait insecticidal method, fried wheat bran or cottonseed cake 5 kg with 50% phoxim 50 ml add 1 kg of water spray evenly, sprinkle into the line in the evening.

Eliminate large and small seedlings

As the saying goes, big seedlings bully small seedlings, but small seedlings do not bear peaches, which means that big seedlings are large and have strong glory and nutritional advantages, while weak seedlings are more passive under inferior conditions, and the gap between the two is widened. The formation of such a population structure will not get the ideal yield. Therefore, in the cotton field management, it is necessary to apply eccentric fertilizer to the seedlings early and irrigate the roots with 0.5% 1.0% urea solution (low concentration is used when the seedlings are relatively small). The method is to put the solution into the sprayer, remove the sprinkler and seep along the tree, and each tree can seep 150 ml of urea solution.