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Lanyue popularizes plant chemical control technology through organizing or participating in industry conferences, providing face-to-face guidance to growers, and using the Internet and other media.
07
2023
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06
How much do you know about plant growth regulators? What are some that promote growth? Come and see
For the study of endogenous hormones in plants, people are constantly using synthetic methods to make some analogs with plant hormone activity for agricultural production, which is plant growth regulators. Compared with endogenous hormones, plant growth regulators have more targeted and purposeful physiological effects.
Plant Growth Promoters Compounds that promote plant cell division, differentiation and prolonged growth are growth promoters that promote the growth of plant vegetative organs and the development of reproductive organs. This is the largest variety of plant growth regulators, the most widely used category. Other names of
gibberellin (GA) are 920. The product preparations used in agricultural production of GA
are mostly 85% gibberellin crystal powder, 4% gibberellin emulsifiable concentrate, 40% water-soluble tablets and 40% water-soluble powder. Gibberellin is a broad-spectrum plant growth regulator. Endogenous gibberellins are ubiquitous in plants, which are one of the important hormones to promote plant growth and development. It is also an antagonist of inhibitors such as paclobutrazol and chlormequat. Gibberellins can promote cell elongation, stem elongation, leaf expansion, and promote parthenocarpy and fruit growth, break seed dormancy, change the ratio of female and male flowers, affect flowering time, reduce flower and fruit shedding. Exogenous gibberellin into the plant, with endogenous gibberellin the same physiological role. Gibberellins mainly through leaves, twigs, flowers, seeds or fruits into the plant body, and then transmitted to the active growth of the site to play a role. Gibberellins are widely used in agriculture, forestry and horticulture.
Naphthalene acetic acid (NAA) Other names Fengyousu and Maijian
Common preparations are 80% raw powder, and commercially available dosage forms include 99% refined powder, 2% sodium salt water solution, 2% potassium salt water solution and 4.2 naphthalene acetic acid water solution. NAA is an auxin-like substance and a broad-spectrum plant growth regulator. The main effect on plants is to promote cell division and expansion, induce the formation of adventitious roots, increase fruit set, prevent fruit drop, change the ratio of male and female flowers, and can promote plant metabolism and photosynthesis, accelerate growth and development and enhance resistance. NAA enters the plant from the tender epidermis of leaves, branches and seeds, and is transported to the site of action with nutrient flow.
auxin (IAA) other names indoleacetic acid, heteroauxin, auxin 3-indoleacetic acid and other
products used in agricultural production are mostly powders and wettable powders, which are synthetic products with auxiliary materials. Auxin has a wide range of physiological effects. It affects cell division, cell elongation and cell differentiation, and also affects the growth, maturation and aging of vegetative organs. Artificial synthesis can be absorbed through stems, leaves and roots, due to different application concentrations, can play a role in promoting, but also play an inhibitory role. Because indole acetic acid is easy to decompose by light, it is easy to be decomposed by indole acetic acid oxidase in plants, and the price is more expensive, the application in production is limited. It is mainly used in tissue culture to induce callus and root formation. Other names of
2,4-D are chiguoling, and the common dosage forms of antidote
are 80% wettable powder, 72% butyl ester emulsifiable concentrate, 55% and 50% amine salt solution. 2,4-D can produce a variety of different effects on plants depending on the concentration and dosage used: it is one of the medium components for plant tissue culture at lower concentrations (0.5-1.0mg/L); at moderate concentrations (1-25mg/L), it can prevent flower and fruit falling, effectively stimulate growth, induce seedless fruits and fruit preservation, etc; higher concentration (1000mg/L) as a herbicide can kill a variety of broad-leaved weeds. Therefore, attention must be paid to the amount used when applying to crops. Higher concentration, inhibit growth, higher concentration can make plant deformity development death. As a herbicide used after germination, monocotyledonous grasses have a certain tolerance to them, and dicotyledonous broad-leaved plants are very sensitive to them. Using this selectivity, it can be used to control broad-leaved weeds in rice and wheat grasses. 50% 2,4-D amine salt is 200ml/mu, and 20 days after the dosage is applied, it has excellent control effect on broad-leaved weeds such as water peanut, law grass, birdshot berry, amaranth, fry, oxalis, ground brocade, pringles, and bowls in citrus orchards, and the weeding effect is 92.5-100. It also has good prevention and control for one-year canopy, concave head amaranth, Xanthium sibiricum and Polygonum japonicum, with the drug effect of about 80%. The low control effect may be related to the higher age of the above four weeds and grasses, most of which have blossomed and bear fruit. The 50% 2,4-D amine salt was safe for citrus trees at the tested dose.
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