Plant Growth Hormones: Things You May Want to Know

Plant growth regulators are widely used in agriculture. It can regulate the growth and development of plants and improve the growth of crops. Different plant growth regulators have different effects.First: promote seed germinationSome factors may cause low germination rate or germination failure of seeds, such as long storage time, poor storage environment, immature seeds, etc. The use of gibberellin can promote seed germination and increase seed germination rate. Different plant growth regulators have different effects on different seeds.Second: Promote the development of plant roots and plant short and strong seedlingsGrowth inhibitors belong to one type of plant growth regulators. It can overcome the influence of environmental conditions, delay the growth of seedlings and promote the development of the root system of the plant, to plant dwarf seedlings. Paclobutrazol and paraquat have a good effect on the cultivation of dwarf seedlings. Their main application methods are spraying on the leaves and seed treatment during the seedling stage.Third: Promote the filling of plantsThe use of plant growth regulators such as auxin, gibberellin and cytokinin during the booting and flowering stages of grains can increase yield and grain filling.Fourth: Enhance the lodging resistance of plantsHigh-stemmed crops may fall in later stages. The use of plant growth regulators such as paclobutrazol, uniconazole, and calcium regulator can increase the stem thickness of plants, control plant height, and prevent plant lodging.Fifth: Prevent plants from falling flowers and fruits to promote fruit settingThe flowers and fruits of cotton, beans and melons have a great relationship with the nutrient hormones in the body. Use auxins and growth inhibitors to improve its growth status and balance hormones, thereby preventing flower and fruit falling, and increasing fruit setting rate.Sixth: accelerate plant maturityEthephon can promote fruit ripening. Different plants need different plant growth regulators to promote fruit ripening.But it should be noted that:First: Do not increase the dosage at will. Otherwise, its growth may be inhibited, and in severe cases, the leaves may become deformed, dry and fall off, and the entire plant may die.Second: Can not mix at will. After carefully reading the instructions for use and testing, we can determine whether they can be mixed.Third: Use the method properly. Follow the instructions to dissolve the medicine.

Features1. Inhibit vegetative growth, promote reproductive growth, promote lateral bud growth and rooting, and keep stems and leaves dark green.2. Control flowering time, promote flower bud differentiation and increase fruit setting rate.3. Promote the accumulation of sugar and dry matter, promote fruit color change and improve storage tolerance.4. It has the effect of shortening plant nodes and resisting lodging.5. Reduce herbicide damage, improve plant resistance to cold, drought and disease, and ultimately achieve the purpose of increasing yield and improving quality.ApplicationProhexadione calcium can not only reduce the height of rice plant, shorten the length of plant internodes, but also increase the number of grains in the panicle at a lower dose, with a significant increase in yield and no residue.Prohexadione calcium acts on wheat to dwarf plant height, reduce internode length, increase stem thickness, increase ear length, 1000-grain weight and increase yield.Prohexadione calcium at a suitable concentration has a certain regulatory effect on improving the accumulation and distribution of cotton biomass, increasing yield and improving quality.Prohexadione calcium has a dwarfing effect on ornamental plants such as chrysanthemum and rose, and can also adjust the color of plants.

Title: Plant Growth Regulators Category: Pesticide Sources: China Plantation Grand View · Pesticide Rolls Plant growth regulators are a class of substances that have similar physiological and biological effects as plant hormones.It has been found that substances regulating plant growth and development are amine fresh ester (DA-6), chlorpyrifos, sodium nitrophenolate, auxin, gibberellin, ethylene, cytokinin, abscisic acid, brassinolide. Salicylic acid, jasmonic acid, paclobutrazol and polyamines, etc., and used as plant growth regulators in agricultural production are mainly in the top nine categories.

Plant growth regulators are the product of comprehensive development of various scientific technologies such as organic synthesis, microanalysis, plant physiology and biochemistry, and modern agriculture, forestry and horticulture. In the 1920s and 1930s, traces of natural plant hormones such as ethylene, 3-indole acetic acid and gibberellin were found in plants, which have the effect of controlling growth and development. In the 1940s, research on synthetic analogues began, and 2,4-D, amine fresh ester (DA-6), chlorpyrifos, sodium nitrophenolate, α-naphthylacetic acid, and bud-dan were gradually developed. Promote use and form a category of pesticides (see table). More than 30 years of artificial plant growth regulators have been synthesized, but due to the complicated application technology, their development is not as rapid as pesticides, fungicides and herbicides, and the application scale is also small. However, from the perspective of the needs of agricultural modernization, plant growth regulators have great potential for development, and there has been a trend of accelerated development in the 1980s. China has been producing and applying plant growth regulators since the 1950s.For the target plant, the plant growth regulator is an exogenous non-nutritive chemical that is usually transported to the site of action in the plant and promotes or inhibits certain aspects of its life process at very low concentrations. To meet the needs of human development. Each plant growth regulator has a specific use, and the application technology requirements are quite strict, and specific effects can be exerted on the target plant only under specific application conditions (including external factors). Frequent changes in concentration result in opposite results, such as a promotion at low concentrations and inhibition at high concentrations. Plant growth regulators have many uses, depending on the variety and target plant. For example: control germination and dormancy; promote rooting; promote cell elongation and division; control lateral buds or tillers; control plant type (short-strong anti-fall); control flowering or sex ratio, induce no fruit; flower thinning, control fruit drop Control the shape or maturity of the fruit; enhance stress resistance (resistance, drought resistance, salt tolerance, antifreeze); enhance the ability to absorb fertilizer; increase sugar or change acidity; improve flavor and color; promote latex or resin secretion; Or evasive (for easy mechanical harvesting); preservation and so on. Some plant growth regulators are herbicides used at high concentrations, and some herbicides have growth regulation at low concentrations.

1. The dosage should be suitable, and the dosage should not be increased arbitrarily. Plant growth regulators are a class of substances that have similar physiological and biological effects as plant hormones and cannot be used in excess. Generally only a few grams or a few milliliters per acre. Some farmers are always afraid that the amount of use is small, and there is no effect. If you increase the dosage or use the concentration at will, it will not promote the growth of the plant, but will inhibit its growth, and even lead to malformation, dryness, and death of the whole plant.2. Can not be mixed at will. Many vegetable farmers use the plant growth regulator to save time and often mix it with fertilizers, pesticides, fungicides, etc. Whether plant growth regulators and chemical fertilizers, pesticides and other substances can be mixed, must be carefully read and used after testing, can not be determined, otherwise it will not achieve the role of promoting growth or preservation of flowers and fruits, supplement fertilizer, but will be improperly mixed A phytotoxicity has occurred. For example, the ethephon solution is usually acidic and cannot be mixed with alkaline substances; the amine fresh ester is easily decomposed by alkali and cannot be mixed with alkaline pesticides and fertilizers.3. The method of use should be appropriate. Some vegetable farmers often do not read the instructions carefully before using the plant growth regulator, but use the plant growth regulator directly with water. Whether it can be directly watered must be seen clearly, because some plant growth regulators can not be directly dissolved in water, if not prepared into the mother liquor and then formulated into the required concentration, the agent is difficult to mix, will affect the use of the effect. Therefore, it must be diluted in strict accordance with the instructions for use.4. Growth regulators are not a substitute for fertilizer application. Growth regulators are not plant nutrients. They can only regulate growth and cannot replace fertilizers. In the case of insufficient water and fertilizer conditions, spraying too much plant growth regulator is harmful. Therefore, when plant growth is found to be poor, it is first necessary to strengthen the management of fertilization and watering, and on the basis of this, the growth regulator can be used to effectively exert its effects.5. Plant growth regulators are pesticide products. The product packaging must have a formal "three pesticides" and the labeling zone is yellow.6. Strictly follow the instructions and take protective measures to prevent the impact on people, livestock and water safety.