What to do before sowing cotton?
Second, preparation before broadcast Third, timely sowing, strict control of sowing, one broadcast full seedlings
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1. Strong resistance. The main resistance to cotton bollworm, Spodoptera litura, red bollworm, resistance to verticillium wilt, high temperature and humidity.
2. High quality. The shell book, good flower inspection, boiled, smooth, medium height (130-150 cm), tower type, bell-oval type, boll weight difference is small, an average of 6.5 grams of single bell, high clothing (45%), The leaves are medium in size, with 4-5 individual bells and more than 3 seeds per cottonseed.
3. Proper growth period. Usually about 125-135 days.
4. Fertility and high yield. Generally more than 400 kg of seed cotton per mu square meter.
Generally speaking, it is a combination of high-resistance, multi-resistance, high-quality fertilizer, and high-yield.
1. Do a good job in raising the ditch (mainly to open a good ditch, namely the ditch, waist ditch, ditch ditch). To open a good ditch is the basic work of cotton cultivation technology measures to ensure that cotton has one of the main measures of vitality root system. The ditch is 0.5-0.6 cm deep and 0.4-0.5 cm wide; the ditch is 0.6-0.7 cm deep and 0.5-0.6 cm wide; the ditch is about 0.3 cm deep and 0.4 cm wide. Do not rush to the field when it rains, the rain does not accumulate water, not stained.
2. Implementing reforms and expansions to implement a large-scale, wide-window plant cultivation model and implementing standardized cultivation. The row spacing is 1.2 meters, the plant spacing is 0.4 meters, and 1380 acres are planted; the plant spacing is 0.45 meters and the acres is planted with 1230 plants; the plant spacing is 0.5 meters and the acres are planted with 1100 plants; the plant spacing is 0.55 meters and 1000 plants are planted; the plant spacing is 0.6 meters and 920 plants are planted.
3. Seedbed selection. Select a plot with fertile soil, good drainage conditions, sunny leewards, no dryness and Verticillium wilt.
4. Prepare nutrition soil. That is to say, in the place where the seedbed is set, the topsoil will be dug, the frozen soil will be sunburned, and the soil will be ripened. 30-40 days before sowing, fertilize nutrient soil. Cotton seedlings advocate high phosphorus, high potassium, low nitrogen, and the proportions of nitrogen, phosphorus, potassium, boron, zinc, and magnesium should be reasonable in order to grow young seedlings. That is, each mu of Datian nutritious soil needs to add 45% compound fertilizer 3-5 kg, potassium fertilizer and boron fertilizer 0.5 kg, plus 5 kg of cooked cake fat, fully mix and hit the tight film, every 10-15 Turn over once a day to fully ripen it.
5. Sowing. Generally 1-2 days before sowing 2-3 days sowing seeds, breaking seed dormancy, conducive to emergence.
1. Preparation for pre-casting. First, the bottom of the seedbed should be leveled before sowing so as to make the surface smooth and consistent; second, 25 grams of crystal trichlorfon per acre of field nutrient soil should be added, and the mixture should be prepared after mixing well; Fill in fine pores; fill the cover with cover seed dust (fire and earth ash can not be used to cover the seed ash, because of fire and soil ash absorption).
2. Increase the area of ​​nutrients. The size of the nutrient bowl is the key to the decision to grow seedlings, and 6 cm is appropriate.
3. Strengthen the three disinfection of the seedbed. In order to prevent seedlings from being dead, it is necessary to enhance disinfection during the nursery. That is, seed bed disinfection; bauxite soil disinfection; cover seed ash disinfection, so that the soil bacteria-free.
4. The width of the seedbed is more than 1.4 meters and the length is 8-10 meters. In order to increase the temperature within the film and cool quickly, adjust the temperature and humidity in the film in time.
5. When the system is made, it is necessary to make the side cover membrane to avoid water loss and affect the emergence. At the same time, we must standardize our business. We must keep our hands flat and neatly consistent so as to improve the emergence of seedlings.
6. Fill the gap between the rake and the rake with the prepared soil to make sure the water is moist.
7. timely sowing is the key to broadcast a full seedlings. Temperature index: suitable for the sowing period when the local stability through 15 °C.
8. Strictly control the sowing volume and broadcast all seedlings. Only one seed should be sown, and the seeds should be laid flat. The thickness of the cover seed ash should be 1 cm, and the cotton seedlings should be homogeneous, uniform and strong. After the cover is covered with the cover film, it can be covered with a single film or a double touch.