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Cotton chemical regulation has its finer points: master these technical essentials

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In recent years, with the widespread popularization and application of insect-resistant cotton, plastic film mulching and chemical regulation technology, cotton farmers have shown some undesirable cultivation tendencies in cotton cultivation techniques, especially in chemical regulation technology (hereinafter referred to as chemical regulation). Failure to pay attention to timely and appropriately timed chemical regulation leads to excessive vegetative growth and rank growth in cotton fields, over-vigorous vegetative growth, and relatively serious shedding of squares, flowers and bolls, ultimately causing cotton plants to become tall, large and empty, with severe lodging when hit by wind and rain later on, resulting in relatively large losses. During chemical regulation, the goal should be to steadily build a high-yielding framework and increase squares and preserve bolls, mastering the

In recent years, with the widespread popularization and application of insect-resistant cotton, plastic film mulching and chemical regulation technology, cotton farmers have shown some undesirable cultivation tendencies in cotton cultivation techniques, especially in chemical regulation technology (hereinafter referred to as chemical regulation). Failure to pay attention to timely and appropriately timed chemical regulation leads to excessive vegetative growth and rank growth in cotton fields, over-vigorous vegetative growth, and relatively serious shedding of squares, flowers and bolls, ultimately causing cotton plants to become tall, large and empty, with severe lodging when hit by wind and rain later on, resulting in relatively large losses.

During chemical regulation, the goal should be to steadily build a high-yielding framework and increase squares and preserve bolls, mastering the principle of "watching the sky, watching the soil, watching the seedlings", and based on the daily growth increment of the cotton main stem, using plant regulators in a timely and appropriate amount for chemical regulation, mastering the method of "small amounts many times, light and frequent regulation, light early and heavy later". Adopt proactive chemical regulation to ensure robust but not rank growth of cotton plants. The number of chemical regulation applications should be flexibly controlled according to the characteristics of the cotton variety combined with the growth condition of the cotton plants at the time, inferring the growth condition in the near future. Judging from the cotton growth at the time, if regulating is possible and not regulating is also possible, then when it is not too dry, chemical regulation must be carried out; if you wait until regulation is absolutely necessary, it will be too late to regulate, and this is the difference between proactive chemical regulation and passive chemical regulation. The squaring stage is the key period for shaping plant architecture, with less pesticide used and better results, so the first chemical regulation must be started; if the growth during the seedling stage is too vigorous, the first chemical regulation should be advanced.

Issues to note during the chemical regulation process: 1. Chemical regulators are different from fertilizers and pesticides, and cannot replace fertilizers and pesticides. 2. Chemical regulators are not easily used on cotton fields with insufficient water sources, poor soil fertility and weak growth showing premature senescence; strengthen fertilizer and water management for cotton fields where chemical regulation technology is implemented, to prevent drought or fertilizer deficiency. 3. Throughout the entire growth period of cotton, the implementation of chemical regulation technology should master the principle of small amounts and multiple applications, to prevent excessive chemical regulation or phytotoxicity. 4. Spraying growth regulators should be carried out on clear days after 4 p.m. If moderate rain occurs within 8 hours after spraying, re-spray. 5. Since chemical regulation mainly controls the cotton growth point, for cotton varieties with upturned fruiting branches and medium length, top-covering spraying is carried out at this stage, while for varieties with longer and flat-spreading fruiting branches, the growth points of the fruiting branches should be appropriately controlled.

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