1. "High, large, empty" cotton fields. The main difference between the above-mentioned cotton fields is that the vegetative growth is strong and the reproductive growth is weak. The lower part is basically no bell, the middle bud flower is heavy, the leaves are large, the leaves are dark, the plants are tall, and the internodes are long. Mainly caused by malnutrition and pests. In addition to the management of the above-mentioned cotton fields, it is advisable to control the use of nitrogen fertilizers, apply more phosphorus and potassium fertilizers; remove empty plants without buds and no tops; appropriate postponement of topping, spray “920†buds after topping; The larvae of the cotton bollworm above the age and the spraying effect are not good, and can be combined with the pruning artificially.
2. A cotton field that is basically normal but depressed. The density of this type of cotton field is medium, the plant height and the bud are normal, but the leaves are larger, the leaf layer is denser, and the ventilation and light transmission are poor. It mainly occurs in fertile plots, hybrid cotton plots, or intensively controlled heavy branches and leaves, or more leaves, which is equivalent to an increase in the number of plants. The potential danger of this type of cotton field is the large loss of the central bud and the lower ring. It is advisable to remove 4 to 5 old leaves on the lower empty branches, ineffective leaf branches and central main stems before the rainy season, to quickly improve the ventilation and light transmission conditions of cotton fields, control the amount of nitrogen fertilizer, and focus on phosphorus and potassium fertilizers. Realize the autumn peach cover and capture high yield.
3. Cotton fields with high density and normal growth. Due to the drought in June this year, some sandy cotton fields, although dense, have normal fertility, high plant height, moderate leaf size, and 2 to 3 bells in the lower part. This type of cotton field has a high hope of high yield, and the management focus is to prevent post-fertilization. If the topdressing is less or not topdressed, the urea will be applied with 7.5~10 kg of urea. If the topdressing is difficult, the number of foliar sprays can be increased. The first two sprays are mainly nitrogen, and the latter two sprays are mainly potassium. After the topping, the medium-level control is maintained, and the state of the big line seems to be sealed. It is not advisable to leave fruit branches and flower buds on the upper part. Be prepared for the later drought-resistant watering, and strive to increase the weight of autumn peaches.
4. Cotton plants with high density, high plant height and abnormal growth. It was mainly caused by the high density, sudden rain in the early period, or rain after pouring, which was not caused by timely chemical control. The leaves of this type of cotton field are often not very large, and the leaves are not deep, not really strong. Should immediately stop the repression and safety control, shrinking safety should use qualified products; continue to topdressing without topdressing; remove weak and weak plants, empty branches and ineffective leaf branches, when possible, carry out ploughing and digging, and improve the cotton field environment.
5. The vegetative growth is weak in cotton fields. Mainly dry and irrigated cotton fields, the plants are shorter; the anterior peaches are more, the internodes are shorter, the leaves are small, the flower buds are large, the tops are constricted, and the flowering is close to the upper part. Some have already applied nitrogen fertilizer, but the effect of small fertilizer has not been fully exerted. The main danger of this type of cotton field is the influence of the autumn bell. The urea should be sprayed immediately to spread the upper leaves and the fruit section. The concentration of the urea solution should be lower, but the spray volume should be larger. The cotton field with severe shrinkage is sprayed with "920" after topping, and the upper fruit branches are stretched out and then squashed. Some of these cotton fields have high hopes of production, and water sources should be developed to create conditions for watering.
6. Easy to disease cotton field. Cotton has been inhibited by the high temperature in the past month, but the potential risk of the disease cannot be underestimated. Recently, due to the increase in rainfall, many cotton fields have been on the rise, and should be sprayed with yellow and other drugs for prevention. Generally, it is sprayed with 300-500 times liquid, and the root of the diseased plant is filled with 200 times liquid. Adding urea can improve the control effect and strive not to spread the diseased leaves upward.
All kinds of cotton fields above should strictly prevent the occurrence and damage of the third generation of cotton bollworm, cotton blind mites and other pests. After the rainfall, the surface area water should be discharged in time to prepare for the later drought-resistant watering to ensure the normal development of autumn peach.
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