Solve the difficulties in cotton control
At the “Key Cotton Training Seminar†convened by the Guoxin General Conference in early March of this year, 17 participants reached the following consensus on cotton chemical control technology (the application of shrinking security): Cotton chemical control is the technology with the highest input-output ratio. The input of the drug mu is only a few yuan, which can increase the yield of several tens of times and hundreds of times. The most important period of chemical control is the bud stage of cotton, but it is difficult to grasp the best application time and application amount. Therefore, chemical control is both a very important technology and a difficult technology.
Based on experimental data and the people's experience, the author combined his own learning, observation, and practice to talk about the experience of cotton control, for research and reference.
1. The only basis for the control of cotton seedling stage is the daily increase in plant height. Not every cotton field needs to be controlled every time. Before the five leaves of cotton seedlings can be considered without chemical control, 6-8 leaf height increased by more than 1.5 centimeters, bud period more than 2 centimeters, it is necessary to control, the growth rate is reduced, inhibiting the growth of long shoots, promote root growth Bars and stalks are stout. It lays the foundation for a reasonable growth process and a preset output structure for the entire growing season of cotton. This indicator is applicable to 3500-5000 cotton fields with mu density.
2. The main factors that determine the daily increment of cotton seedlings are soil fertility, lyrical temperature and air temperature. It is necessary for the three to consider comprehensively and not only to look at soil moisture. If the soil moisture is poor, and the soil fertility is higher, and the temperature rises again, the cotton seedling will still grow.
3. How much can we use to control the cotton seedlings? This is the most difficult problem to judge. The key is the soil fertility factor. Some acres with 0.3 grams can work, some with 1 grams does not work, the difference is large, often unexpected. Do not overestimate the control capacity of the contracted security, when the cotton flower bell is in full bloom "water, fertilizer, heat meet", a mu spray 10 grams shrinking security is not the upper limit.
4. The timing of the loss of control can not be repeated. Only the next time can be considered. This is the harshness of control.
5. After the control, the darkened leaf color, the new leaves become smaller, the internodes become shorter, and the growth rate becomes slower. This is the purpose of chemical control, and may be shorter than the adjacent uncontrolled plants. This thinks that the control has been overdone. Whether or not it is overdone will still depend on the increasing amount of plant height after chemical control. If the growth is too slow, it can be used to spray urea solution, or even spray "920" to ease.
6. In order to provide scientific basis for chemical control, it is necessary to select a representative section for regular plant height measurement and it is not difficult for cotton planters to do so. When measuring, the feet should stand on the small pedestal membrane. If the general station stands between the large rows, the soil will be compacted, causing artificial environmental differences and affecting the normal growth of cotton plants.
7. There are different spray methods, multiples of water and multiple functions, which should be fully exploited. In addition to the “top-down†“stuck with drugsâ€, there will be “whole medicineâ€. Akira jets, as well as oblique jets, side jets, horizontal jets, etc., can be used to control the extension of the lower madness and the closure of "group tips", upper axillary buds, and small pods after topping to minimize tedious labor. Fine pruning.
8. Shrinkage can add pesticides, foliar spray with spray, but to comply with the needs of chemical control, drug fertilizer is just the way to take into account. If you cannot coordinate, you can work separately.
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