During the whole growing period of cotton, the problem of weeding was concentrated in the early period, namely, the four periods of pre-planting, seedling, and middle flower buds. During these four growing seasons, weeds compete for light, compete for fertilizers, and compete for water due to their unique biological habits. Under extreme circumstances, weeds form the “grass and bully†and become the enemy of cotton growth. After the cotton enters the boll season, the field cotton is sealed to form a “grass seedling†situation, and grass damage is no longer the main contradiction to cotton growth. Therefore, the so-called "full control of grass" actually refers to the cotton grass control technology in the early stage. Cotton full grass control technology I. Preparation before planting 1. Select cotton seeds and eliminate mixed weed seeds. 2, decomposed organic fertilizer, the organic fertilizer after 50-70 °C high temperature stacking processing 2-3 weeks, can kill weed seeds. 3, the preparation of the field. If the previous crop in the cotton field is winter free field, autumn deep plunge can bury the weed seeds of the end of the year to the bottom, reducing the weed seeds in the topsoil, and at the same time, put perennial weeds such as fresh vegetables, fragrant glycosides, and trigonal weeds. The underground rhizomes of the eyelids and turnips are turned to the surface, and they can be eliminated by freezing and drying in winter. Sowing the stubble land before sowing can eliminate the weeds that sprout in the fall or early spring. If the number of weeds on the surface is large, and the type of weeds and perennials are dominant, the effect of turning the land will be insignificant. All fields should be used to eliminate weeds according to the conditions in the field. Glyphosate water agent 400-600 grams or 41% Roundup lotion or 41% first-hand water agent 100-150 milliliters or 74.7% farmer's music water-soluble granules 40-60 grams, 30-45 liters of water, all field spray. If the pre-harvest harvest can use 10% glyphosate 500-800g or 41% Rounda or 41% first-hand water 150-200ml or 74.7% farmer-soluble water-soluble granules 50-80g per mu. For 30-45 liters of water, all fields spray; under the circumstances of agricultural tension, can choose 20% per acre grams of traceless water agent or 20% of fresh water agent 200 ml, 30-45 liters of water, all field spray. The above treatment is called chemical extermination, and is mainly applied to the cotton region of the Yangtze River Basin. Second, the sowing period In the sowing of cotton in the area north of the Huaihe River, due to the lower ground temperature, the weeds germinate later, and the method of soil closure is generally adopted. The specific measures are: before the emergence of the mulching film or after the transplanting of the soil, an amount of 50-60 ml of 50-60 ml of nicotine emulsifiable concentrate or 100-120 ml of acetochlor EC 50-l5 litres of water can be used per acre, and the soil surface can be aligned with the soil surface. Evenly spray, or use 40% trifluralin cream 50 ml per mu, spray evenly on 30-45 liters of water, then cover the soil and then evenly mix, then cover the membrane. The dose of the above-mentioned varieties for live cotton needs to be increased by about 30% in order to achieve the same control effect. In addition, the amount of soil-enclosed herbicide is related to the content of organic matter in the soil. The higher the content of organic matter in the soil, the greater the amount of soil organic matter. The northeastern region has the largest amount of usage, and the amount of cotton in the Yangtze River Valley has decreased accordingly. After weeds are unearthed, depending on the age and type of weeds, selective herbicides of stem and leaf type are used for control. If the field is dominated by grassy weeds, use 10.8% of the plantlet per mu to produce 20-30 ml of emulsifiable concentrate or 10.8% of efficient straw-grown herb to 20-30 ml, or choose to use 5% Fast Cyanine Emulsion 40-50 ml or 5 Forty grams of refined grass grams 40-50 ml, 30-45 liters of water, evenly sprayed on the weeds stems and leaves. If field grass weeds are mixed with broad-leaved weeds, the above-mentioned agents can be mixed with 10-250% of loquat emulsifiable concentrate or 10% of diflufenazu emulsifiable concentrate in 20-25ml of water, 30-45 liters of water, evenly sprayed on the weed stems. Leaf surface. It should be noted that in the case of mixed use with lavender, low-directional spray must be used when spraying, and spraying should not be repeated. During this period, if the cotton seedlings have not been excavated, herbicides treated with dead leaves or stems such as glyphosate or paraquat should be used with caution; however, cotton seedlings cannot be used once they are unearthed. Third, seedling stage When the seedlings are unearthed, they will enter the seedling stage, generally in the spring and rainy season. No matter the temperature or humidity, it is very beneficial to the growth of weeds. It is a critical period for grass control. If weeds are not controlled during this period, we will form a “grass-fighting seedling†situation until grass shortage. The cotton in the seedling stage is relatively weak, and safety issues should be paid attention to when selecting the herbicide species. Under normal circumstances, weeding at this time can only solve the hazards of grass weeds in the field. For broad-leaved weeds, we can only wait until the late stage or bud stage of the seedling stage. Each mu can choose to use 10.8% of the device to deliver 20-30 ml of emulsified oil or 10.8% of efficient straw-covered straw to 20-30 ml, and also can choose to use 40-50 ml of 5% fast-acting cream oil or 40-50 ml of 5% refined grass. 30-45 liters of water, evenly spray on the weed stems and leaves. The above agents are very safe for cotton itself, and have a good control effect against grass weeds. When the cotton plant height exceeds 35 cm, the lower part of the cotton stem has begun to turn red and gradually becomes lignified. If the field grasses are dominated by grass weeds, chemical cultivators may continue to be used as described above. If the density of field broad-leaved weeds and perennial weeds is high, simply use the above herbicide to control grasses. Use 10% glyphosate water solution 800-1000g or 41% Roundup water agent or 41% first-hand water agent 150-200ml or 74.7% farmer water soluble water-soluble granule 80-100g per mu. Next, use 20% of traceless water or 20% of new sharps 200ml per acre, 30-45 liters of water, and low-level directional spray of weeds between the cotton rows. Under conditions, add Orient the protective cover and keep the liquids of the cotton plants at a certain distance to prevent the liquid from spraying on the cotton plants to cause injury. Fourth, bud stage After the cotton enters the flower bud stage, the degree of lignification of the lower stem is relatively high. At this time, the herbicide available for selection is basically the same as that described above. The specific herbicide species are selected depending on the grass condition in the field. A field survey this year has found that the distribution of weeds in cotton fields is closely related to the cotton seedlings, and the practice of using seedlings with pesticides should be adopted so as to “see grass and grassâ€. In addition, because cotton has an infinite flowering habit, its own compensation is very strong, so it can be considered economically and effectively to improve safety considerations, but this does not mean that it is free to use the herbicide. There are more rains during flower buds, and herbicide species should be considered when avoiding rainfall that may have adverse effects on efficacy. At present, it seems that 10.8% of projects, 5% faster, and 5% lean oxime should be used as preferred targets. The above four periods are the main stages of weed control. In addition to the above-mentioned chemical control measures, it is also possible to combine agricultural operations in the field and to manually remove sporadic weeds. After entering the flower buds, cotton began to seal off, forming a "seedling pressure" situation, weeds no longer become the main factor affecting the growth of cotton. If there are sporadic weeds in the field, it can be manually removed in conjunction with agricultural operations.
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Cotton full grass control technology