Good harvest for cotton harvest in July and August
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Second, the cotton flower management period focus
1. Stable application of bud fertilizer, reapplying, early application of flower bell fertilizer, make-up cover top fertilizer. According to the survey on the services I will send to the countryside, due to the influence of low temperature and rain, some cotton fields have not yet bloomed. For this type of cotton field, it is necessary to make timely application of leprosy, and the total weight of urea per hectare is 5 to 7.5 kilograms of phosphate fertilizer. 50 kilograms or 15 to 20 kilograms of diammonium phosphate, plus 0.5 to 1 kilograms of boron and zinc fertilizers, combined with cultivator cultivator for furrows. In the cotton field that enters the flowering stage, it is necessary to apply early and reapply flowers and bolls. Generally, the flower and boll mu will be used to recover 20 kg of urea (30 kg of high-yield fields) and 15-20 kg of potash fertilizer. When the amount of fertilizer is large, it can be used twice. The flowering time is once and the bell is in full bloom once. Cover top fertilizer is generally applied at the end of late July and early August, and the top cover fertilizer should not be too late to prevent late-maturing lust. Before the boll opening, after topping, on the decontamination cotton field, extra-root dressing is performed with 2% urea solution or diammonium phosphate, compound fertilizer leachate, once every 7 days, and even sprayed three times.
2. Doing well with local conditions. The use of shrinkage control to not only shape the ideal cotton plant shape, control plant height, but also adjust the nutrient distribution of cotton plants, prevent prosperous growth on the ground, promote root development, and increase disease resistance and insect resistance. In order to prevent overdosing, we should adopt the principle of small amount and multiple times according to local conditions. Generally, the amount of mu should be 0.3 to 0.5 grams for budding, 1 to 2 grams for early flowering, 3 to 4 grams for blooming, and 7 days after topping. 5-6 grams. Through chemical regulation, the plant height of the flowering stage of cotton is controlled at 80-90 cm in the south and is controlled at about 130 cm after topping. The northern cotton area is controlled at about one meter.
3. Fine pruning, timely topping. Fine pruning is a traditional technique for cotton production and stable production, and should continue to be used and improved. The time for topping is generally appropriate around July 15th, when it is time to wait for branches and branches to be unequal. For the late transplanting of cotton fields, to prevent late ripening, early play can be appropriate. For the simplified pruning and pruning-free cotton fields left by the northern leaves, the top of the leaves should be destroyed when three secondary leaf branches grow on the leaf branches. The main stem topping time can be earlier than fine pruning.
4. Do a good job of prevention and control of major pests and diseases. After the month of July, the cotton-lipped cocoon enters the generation overlapping and alternately, and it is also the most difficult period to prevent and control. According to the habit of blind stink bugs, in the nymph stage and early damage stage of blind sturgeon, it is used early or late in the evening for prevention and treatment. The policy of leaving the remnants. To achieve this requirement, it is necessary to do a good job of forecasting and control when the top new victim plant rate reaches 3% to 5%. For the more serious cotton fields, timely inspection after the prevention and control, if not completely to prevent and control until complete. The special treatment for the prevention of blind stupas is Jinke bell, followed by chlorfenapyr, chlorpromone, malathion, etc. The above pesticides also have higher control effects on bollworms, etc., and can be used for more than one drug. After the drought, Stardick spiders have serious problems. They must be promptly inspected and controlled in time. The specific drug is avermectin, and the peak period for the occurrence of flumoxibuses is in mid-July. The specific drugs for prevention and treatment are acetamiprid, imidacloprid, and pymetrozine.
5. Yan explosion-proof pests. Outbreak pests mainly include whitefly, Spodoptera exigua, and small bridges. Whitefly occurs mainly in August and September, and should be ruled in the early stages of the disease. The effective drugs are acetamiprid wettable powder, bifenthrin, avermectin and so on. The outbreak period of Spodoptera exigua (Hübner) and bridge-building insects was in the middle and late August. The main prevention and treatment drugs were A-dimensional salt, diffusive, avermectins, etc. It was necessary to take measures to seize the critical period before the third instar for prevention and treatment.
6. Drought-free row. In July and August, when tube cotton is used, it is necessary to combine the cultivator with soil, so as to make it possible to drain the ridge and dry it to ensure the normal growth of the cotton.
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