Pest Control techniques of Cotton in sowing and Seedling stage
Cotton sowing and nursery stage is an important link in cotton production. According to the forecast of the municipal meteorological station, the precipitation in the spring of 2008 (from March to April) is slightly less, 2000mm 250mm in the Dabie Mountains and 240mm 290mm in other areas. The average temperature in spring is close to the normal year, the temperature changes greatly, the cold air is active frequently, and the cold weather in late spring may occur. It is beneficial to the occurrence of cotton leaf mite and cotton thrips. Due to the large range of temperature change, it is not conducive to the growth of cotton seedlings, reduce the resistance of cotton seedlings, and is also conducive to the occurrence of cotton seedling diseases. In order to ensure the early emergence of whole seedlings and strong seedlings, the following control measures are put forward:
I. Prevention and control of cotton seedling diseases
1. Choose a good seedbed. It is best to use guest soil in the seedbed soil of the seedling bed, and apply fully mature farm manure to ensure that the nutrition bowl soil does not contain Fusarium wilt and other bacteria, and use a large bowl to raise seedlings to ensure the robust growth of cotton seedlings in the seedling bed. If you use the soil that planted cotton last year to make a bowl, you should choose a place where there is no disease nest.
2. Sowing seeds before sowing. The seeds were sown in the sun for 3 days before sowing in order to kill some of the germs on the seeds, enhance the seed vigor, promote the seed ripening, and improve the germination rate and germination potential.
3. Reasonable rotation. Where there are conditions, it is best to implement cotton and Gramineae crop rotation in order to reduce the number of pathogens in the soil, reduce the incidence of cotton seedlings, and be conducive to the growth of cotton seedlings.
4. sow seeds at the right time. According to the climatic characteristics of our city, the seedlings raised in nutrition bowl chose sunny and warm weather to sow in the first and middle of April.
5. Chemical control. When raising seedlings, the seedbed soil was mixed with carbendazim or carbendazim and dimethazone to disinfect the seedbed. After the completion of cotton seedlings, especially in the 1-leaf stage, cotton seedling diseases may be prevalent in case of low temperature and rainy weather. In case of this situation, it is necessary to timely drainage and waterlogging prevention, early light application of seedling fertilizer, and chemical control. The control agents are transplanting Ling EC, or Baoxianke EC, or fulvic acid wettable powder, or cotton wilting net wettable powder, or Lubang 98 wettable powder.
6. Fine ground preparation. Before transplanting, loosen the soil in the stubble field or the previous crop row for 1 / 2 times, so that the rows are flat, the soil is fine, the grass is clean, and the cotton fields with low-lying topography should be deep ditches and high beds. When the soil is not very consolidated, it can be deeply ploughed by no-tillage transplanting.
Second, the prevention and control of seedbed pests. The main pests in seedbed are cotton leaf mite, bug bug and cotton thrips. Regent, acephate, chlorpyrifos and other insecticides are used to control the blind bugs. When the rate of mites in cotton leaf mites is less than 15%, it will be more than 15% universal treatment. The control agents are dacarine, avermectin, acaricides and their compounding agents. Cotton thrips before transplanting damage rate of 5%, choose acetamiprid, carbosulfan, high content imidacloprid and other pesticides control. Before transplanting, the headless seedlings were removed and the healthy seedlings were selected for transplanting.
Third, the control of snails in cotton fields. Under the climatic conditions of Rain Water and continuous rain, snail damage is easy to occur in cotton seedling stage and even bud stage, especially in May. Snails are selected when snails occur.
Fourth, weeding in cotton fields. The combination of ploughing and chemical weeding was adopted. It is suggested that the use of sterilized herbicides should be reduced as much as possible to protect the physical and chemical properties of cotton soil. Chemical weeding: after the emergence of cotton seedlings, weeds 2MUE 3-leaf stage, with Gaicaoling, quizalofop, high-efficiency Gengcao and other spray. In the cotton field where the previous crop is rape, if you use inactive herbicides to control weeds, after rape harvest, choose 10% glyphosate water agent, 41% Roundup water agent, spray 50 kg of water, transplant cotton seedlings a week later, or choose 20 grams of water-free water agent to spray 50 kg water, and transplant cotton seedlings 2 days later.
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The whole Seedling technique of Cotton in one sowing
The whole seedling technology of cotton sowing in one sowing has been a technical problem concerned by our cotton farmers and technicians over the years. Many factors are involved, such as soil temperature, soil moisture, sowing method, seed quality and treatment, etc., which are the key factors that affect the whole seedling. Therefore, we discuss with the majority of cotton farmers on how to realize the whole seedling and strong seedling early development of cotton. First, the preparation before broadcasting. Preparation for sowing is the premise and basis of sowing the whole plant. as the saying goes, "before the soldiers move, the food and forage go first" and "conceive in October and give birth once" all illustrate the importance of preparation. Create soil moisture before sowing: by
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Key points of sowing and Seedling raising techniques of Cotton
First, to prepare the seedbed as soon as possible, we should choose the disease-free land with leeward to the sun, high terrain, convenient drainage and irrigation and low groundwater level as the seedbed. Second, the application of sufficient seedling bed fertilizer should be based on organic fertilizer, and appropriate amount of phosphorus and potassium fertilizer should be added to achieve a scientific formula. If you use ternary compound fertilizer as seedling bed fertilizer, you must have an appropriate amount. When fertilizing, it is necessary to mix well so as to achieve the goal of fertilizing both soil and seedlings. At the same time, there should be little or no application of urea and ammonium bicarbonate, so as to prevent burning root and dead seedlings or overgrowing cotton seedlings, resulting in weakening disease resistance, underdeveloped roots and delayed seedling stage after transplanting.
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