How should plant growth regulators be used to be considered reasonable?
How are growth regulators used on cherry tomatoes? What should be noted? Cherry tomato varieties are broadly divided into two types: one is the indeterminate growth type, meaning the top does not terminate and it can grow continuously; the other is the self-terminating type, which automatically terminates after growing several leaves and continues to grow upward relying on side branches. The management of these two types of varieties differs...
How is the reasonable use of growth regulators determined? Seeking advicePlant growth regulators are some artificially synthesized or naturally extracted organic compounds, applied externally to plants, that at relatively low concentrations have plant hormone activity; they regulate plant growth, change the pace of development, and increase fruit set rate and fruit weight, thereby achieving the effects of increasing yield and income.
There are many kinds of plant growth regulators, and their effects are also different. For example, auxins such as indolebutyric acid, alpha-naphthaleneacetic acid, and 2,4-D are mainly used for cutting propagation, promoting rooting, preventing flower and fruit drop, and promoting fruit set. Gibberellins promote cell elongation, prevent abscission layer formation, break the dormancy of organs such as tubers and bulbs, and can also induce flowering and increase fruit set and parthenocarpy in some plants. Cytokinins mainly promote cell division and induce bud differentiation, and can inhibit organ senescence, increase fruit set, and improve fruit quality. The main roles of ethephon in production are ripening fruit, promoting flowering and female flower differentiation, promoting abscission, and promoting secondary substance secretion. Ethylene inhibitors reduce fruit drop, inhibit fruit ripening, and extend the fresh-keeping life of fruits and cut flowers. Chlormequat, paclobutrazol, uniconazole, daminozide, and others are plant growth retardants, which can shorten internodes, make plant shape compact, and prevent lodging. Brassinolide has the effects of promoting crop growth, increasing seed germination rate, increasing crop yield, and improving crop stress resistance.
When using growth regulators, it must first be clear that they are not nutrients and cannot replace fertilization. They only regulate plant growth and fruiting by affecting hormones and physiological processes within the plant, which is different from trace element fertilizers. When the plant's nutritional status is poor, applying hormones is useless. On the other hand, applying growth regulators is only an auxiliary measure and can only play a regulatory role on the basis of reasonable cultivation management. For example, to prevent wheat lodging, chlormequat can be used for seed soaking, but reasonable dense planting and balanced fertilization are still the main measures.
Second, even a good thing cannot be "used indiscriminately or abused." Different growth regulators have specific effects and specific times of use; nor can the concentration, dosage, and number of applications be increased arbitrarily. Their technical requirements are strict, and improper use can also cause yield reduction and quality decline.
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