Plant growth regulators (PGRs) are chemical substances with the same physiological effects and similar chemical structures as endogenous hormones in plants. Plant growth regulation belongs to a class of substances that control plant growth and development, including synthetic compounds similar to bio or natural plant hormones and hormones directly extracted from natural plants: such as Triacontanol, Natural brassinolide produced from Chengdu Agreenco Bio Tech Co.,Ltd.

 

Plant growth regulators are new substances synthesized by artificial synthesis or cultivation of substances with similar physiological and biological effects to plant hormones. In order to effectively regulate the growth process of crops, improve their quality, enhance their stress resistance, stabilize yield, and increase yield in agricultural production.

 

Some plant growth regulators can be generated by plants under specific conditions, but they can also be sprayed into the plant body. Plant growth regulators regulate the division, elongation, differentiation of tissues and organs, flowering and fruiting, maturation and aging, and dormancy and germination of plant cells separately or in collaboration with each other, thereby affecting plant growth and development and achieving the desired results.

 

In the 1920s to 1930s, trace amounts of natural plant hormones such as auxin, 3-indoleacetic acid(IAA), and cytokinin were discovered, which have the function of regulating growth and development. By the 1940s, research on artificially synthesized plant hormone analogues had begun. Subsequently, various products were developed, including DA-6, Sodium Nitrophenol, and Forchlorfenuron(CPPU), alpha- Naphthylacetic acid(NAA) and etc.

 

(1). The first type is plant growth promoters.It can promote the division, differentiation, and elongation of plant cells, promote the growth of nutrient organs and reproductive organs, prevent fruit abscission, promote plant rooting and germination, and induce parthenocarpy. The regulatory effect is similar to that of auxin, cytokinin, or gibberellin in endogenous plant hormones. Common plant growth promoters include Indole-3-acetic acid(IAA), indole-3-butyric acid(IBA), α-Naphthylacetic acid(NAA), 6-benzylaminopurine(6-BAP), 4-chlorophenoxyacetic acid(4-CPA), natrual brassinolide, Triacontanol, etc.

(2).The second type is plant growth inhibitors. It can inhibit the growth and germination of plant apical meristem, eliminate apical dominance, increase lateral branches, and eliminate weeds. The effect of plant growth inhibitors cannot be restored by the application of gibberellin. Many herbicide pesticides can also act as growth inhibitors when used at extremely low concentrations. The regulatory effect is similar to that of abscisic acid in endogenous plant hormones. Common plant growth inhibitors include maleic hydrazide, glyphosate, shapesin, imidazole, imidazole, and triiodobenzoic acid.

(3).The third type is plant growth retardants. It can inhibit the growth of sub apical meristems in plants, and can inhibit internode elongation without inhibiting apical bud growth. Make plant stems shorter and thicker, increase leaf thickness and chlorophyll content, etc. Due to its main regulation of gibberellin synthesis in plants, its effect can be restored by applying gibberellin. Common plant growth retardants include Chlormequate chloride, Mepiquat chloride, paclobutrazol, butyrylhydrazide, imidazole, and Uniconazole.

(1). The dosage should be appropriate and should not be increased arbitrarily. Increasing the dosage or concentration at will not only fails to promote plant growth, but also inhibits plant growth, and may even lead to leaf deformity, leaf drying, and whole plant death.

(2).Tank mixing carefully under the instruction. Many farmers often mix plant growth regulators with other fertilizers, insecticides, and fungicides. Whether plant growth regulators can be mixed with fertilizers, pesticides, and other materials must be carefully read in the instructions and determined through repeated experiments. Otherwise, it not only fails to promote economic growth or protect flowers and fruits, but also causes damage to the plants.
(3).Reasonable use. Dilution and spraying should be done according to the instructions when using. Attention should be paid to taking protective measures during use.
Plant Growth regulators can only play a regulatory role and cannot be used as a substitute for fertilizers. Spraying much over-dosage plant growth regulators is harmful to plants when there is insufficient water and fertilizer.

 

(1). Plant growth regulators have a wide range of effects and applications. The application scope of plant growth regulators almost includes all higher and lower plants in the planting industry, and controls plant growth and development, improves the interaction between plants and the environment, enhances crop stress resistance, and increases crop yield by regulating physiological processes such as photosynthesis, respiration, material absorption and transportation mechanisms, signal transmission, stomatal opening and closing, osmotic pressure regulation, and transpiration, Improve the quality of agricultural products.

(2). Small dosage, fast speed, high efficiency, most crops only need to be sprayed once within the specified time in a season.

(3). It can bi-directional regulate the external traits and internal physiological processes of plants.

(4).Strong targeting and professionalism. It can solve some problems that are difficult to solve by other means, such as forming seedless fruits.

 

Compared with traditional agricultural techniques, the application of plant growth regulators has the advantages of low cost, fast response, high efficiency, and labor saving. Its using has become one of the important measures in modern agriculture. Plant growth regulators are widely used in the production of economic crops, grain and oil crops, vegetables, fruit trees, horticultural crops, traditional Chinese medicine, and mushroom. Compared to other pesticide and fertilizer products, it improves crop quality faster and has a higher output ratio.

Plant growth regulators will play a significant role in promoting or regulating crop growth, enhancing plant stress resistance, increasing yield, and improving plant quality, which is conducive to large-scale and intensive agricultural production. Its mixing with fungicides, water-soluble fertilizers, etc. is an important support for the integration of water and fertilizer.