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Which day began to control? It mainly depends on the growth of cotton seedlings. It is advisable to develop cotton fields with fast development, large leaves, and high plant heights in early June. The large leaf size of cotton seedlings indicates that the growth of vegetative plants is prosperous, and it must be controlled. The effect of chemical control depends mainly on the amount of drugs, generally In the cotton field, the use of shrinkage 0.3-0.5 g will increase the number of cotton fields that are growing vigorously. It is necessary to eliminate the concerns of the budding period. Once the control is delayed, it will result in passive management. Specific use to grasp the following points:
(I) Use shrinkage that meets national standards. That is, more than 97% of the active ingredient and less than 1.5% of impurities, and other chemicals that do not indicate the content of impurities and unknown ingredients are avoided. In the past, the problems that occurred in chemical control of cotton farmers were either ineffective or too heavy, which were caused by the use of unqualified agents or regulators of unknown ingredients.
(b) Spray medicine must make cotton tip medicine. Because Chuanjiean sprays on the cotton plant and absorbs fast, the transfer is very slow. The new leaves, fruit branches and stems that the cotton plant will produce will be contained in the cotton tip. If the cotton tip is not drugged, it will not reach the next 3 leaves. The purpose of shortening the small and the next three internodes. Therefore, spraying can not only spray on large leaves, when there is a large blade to cover the cotton tip, must be sprayed from the side of the liquid on the cotton tip.
(C) due to Miao Yin film suitable. In the same plot, large seedlings must be sprayed and little seedlings sprayed or not sprayed.
(d) test results. If 3 days after spraying, the new leaves did not change, indicating that the amount of drugs is small, and can be sprayed once as appropriate; if the new leaves are dark and shiny, wrinkles obvious, indicating that it works.
(e) Fertility to increase the dose. Fertile vegetables and garlic to raw land, the amount of drugs does not work, spray a lot of suitable? Can be tested first. Thought not to be confined, particularly fertile land, mu medicine 1-2 grams of medicine are not useful. As long as the dose is increased, there is no control over the cotton fields.
(six) mainly control the dosage of mu. Mu 0. 3-0. 5 grams of medication, 10-15 kg of water per acre sufficient.
(7) The seedlings are not neatly controlled. Single-spraying shrinkage can prevent large seedlings and seedlings from using the same amount of medicine. If pesticides are mixed, it must be based on chemical control. If there are multiple insects, it cannot be sprayed too much, so as not to affect the growth of cotton plants.
(8) It cannot be interrupted after the start of control. The curative period of the contracted An'an is 10-15 days. If it does not continue to be controlled after the initial chemical control, it will cause the growth of the cotton plant to rebound, and it may even make the chemical control work abandon. Therefore, after the start of chemical control, it was once every 8-10 days and the dose gradually increased. How is the interval date and drug amount appropriate? It depends on the growth condition of the cotton plant and weather conditions.
(9) Different dosages of morning and evening medicine are controlled. Chemotherapy started as soon as possible, and began to use more drugs as soon as possible.
(x) Different doses of different doses. Density requirements of the plant to control the short, the control should be appropriate earlier, the larger the amount of drugs; the density of small plant height requirements are not strict, and control can be appropriately relaxed.
(11) Do not forget to top-up fertilizer. After the control of the cotton plant, the darkened leaf color does not indicate lack of fertilizer. The top dressing must be top dressing. In the evenly growing, low-lying plots, it is also possible to add 1% urea when controlling, which not only controls the seedlings but also supplements the nutrients; but do not add fertilizer in cotton fields where the cotton seedlings are not neat, otherwise the big seedlings will be bigger. .
(twelve) combined with weather forecast. It is best to control the rainfall and wait for the rainfall to be controlled before it can easily become passive.
(xiii) How to remedy the situation? In accordance with the above methods of control, there will be no problem of excessive control. There are often four cases of excessive chemical control: one is that the drug amount is calculated wrongly or that the spray is not mastered; the dose of 2 mu is sprayed on 1 mu of land; the second is the forecast of rain, and no rain after spraying; Third, the use of unknown ingredients of nutrients and shrinking Ann mixed spray; four is not effective after the control, then increase the amount of spray. Numerous unknown ingredients in the market contain nutrients, which can no longer be added to reduce the risk of annoying ingredients. If the chemical control is heavy, the 1% urea solution can be used to relieve the problem; if the urea is ineffective, it must be sprayed with "920".
Practice has proved that the cotton fields that have been controlled this year have grown steadily.
According to the meteorological records of the past years, in late May, early June and mid-June, it was the three most warm days in the growing season of cotton; according to the results of the survey conducted by Guoxin Cotton, the survey results showed that: June 10 to July 10 were cotton masters The fastest growing period of stems, the average daily growth of 1.5 centimeters, and it is also the root growth of the most prosperous period, if the ground growth is too fast, will affect the root growth, resulting in unbalanced growth in the ground and underground, but also not conducive to control the strain high. Therefore, most of the cotton fields should be sprayed for the first time in mid-June to start the control.