First time control of cotton to grasp the best period
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When it started to control, it is best to use scientific research on the development and development of cotton, the climate characteristics, and the mechanism of chemical control of drugs.
Production practice, under normal circumstances, the first time spraying cotton budding period (that is, the 4th fruit branch, most of the years in the north cotton area around June 15 to 20) the first time spraying shrinkage security is the best period. This is because:
(1) During the period of Shenglei, the root growth of cotton is the most prosperous period. After that, the growth rate of the root system will slow down and the growth rate of the above ground will accelerate. However, during the period of Shenglei’s control, it played a controlling role in accelerating the arrival of growth on the ground.
(2) After mid-June, the average daily temperature will continue to rise, with less severe cooling, and the chances of meeting in hot days on rainy days will increase. If the budding period does not begin to be controlled, it will be easily caused by the “rain and hot meetâ€. The cotton plant is long and passive and forms passive control.
(3) In the second half of the cotton budding period, the 5th to the 9th fruit branches will successively appear, which is the 5 fruit branches in the middle of the cotton plant. Whether it is possible to control the distance between these five fruit branches and fruit festivals is related to the success or failure of chemical control. The effective period of action after shrinkage spraying is 15-20 days. The control of Shenglei period just works on the 5 fruiting branches in the middle.
Therefore, under normal circumstances, the best time for the first chemical control is before and after the budding period. In fertile areas, early occurrences of cotton seedlings, and rainy years during the seedling stage, chemical control can be appropriately advanced; in the case of barren land, cotton seedlings are delayed. In the years of drought in the fields and seedlings, chemical control can be postponed appropriately.
In fact, many farmers are unable to grasp the timing of their first chemical control. They often become late and miss the best period, resulting in passiveness. The key is to have a good grasp of the amount of medication, and for the first time, the cotton should be controlled. Each mu should be sprayed in compliance with the standard shrinkage safety (including active ingredients of not less than 97%, impurities not exceeding 1.5%) 0.3-0.5 g, Such as hot and humid weather, cotton plants grow vigorously, can increase the amount of drugs; such as drought to dry, cotton growth in general, can be reduced to 0.2 grams; if the cotton plants have emerged as a drought, not only can not control, but also consider watering . Generally, on the third day after chemical control, the color of newly emerged leaves becomes darker, more glossy, and wrinkles appear on the foliage. Then young leaves also appear wrinkled. The leaves move up and the cotton changes its plant type. This is the first Secondary control to achieve the desired effect.
Of course, one-time chemical control alone does not solve the problem. The most rapid growth period of cotton is the flowering period. This phase lasts for about 50 days and must be fully controlled to ensure success. About 10 days after the first chemical control, the cotton enters the flowering stage, and the effect of shrinking the security is gradually becoming smaller. At this time, the cotton plant is large, the daily temperature is high, and the probability of rainfall is even greater, even though the growth rate of the cotton plant is high. Unpleasant, but also a series of second-time control, the dose can be increased to 0.8-1 grams per acre. In the future, the third and fourth chemical control will be performed depending on the growth of the cotton plant and the weather conditions. Otherwise, once the rainfall is controlled again, it is often difficult to control it. It may also offset the results of the first chemical control. Rejection.
In production, it is often observed that some of the cotton agrochemical control drugs hit a lot, cotton is still tall, long branches, large leaves, mainly due to the first time the control of late. The best time for the first control of the cotton region in the North coincided with the wheat harvest stage, and it was necessary to pay close attention to the growth of cotton, so that it would be correct to collect wheat and pipe cotton.
The above specific chemical control time and drug dosage are mainly for the northern cotton area. The southern cotton area should be implemented according to local conditions according to the growing situation of the cotton and weather conditions.