First, the type
1. Growth promoter. It is a synthetic auxin, gibberellin, and cytokinin. It can promote cell division and elongation, differentiation and formation of new organs, and prevent fruit from falling off. Including: 2,4--D, indole acetic acid, indolebutyric acid, naphthalene acetic acid, 2,4,5--T, 2,4,5--TP, carbaryl (carbifine), stimulation , GA3 gibberellin, kinetin, 6---BA, PBA, zeatin and the like.
2, growth retardant. In order to inhibit cell division and elongation growth in the lower part of the stem, the growth rate is slowed down.
Compound. It can lead to shortening of internodes, induce dwarfing, and promote flowering, but has no effect on leaf size, number of leaves, number of nodes, and apical dominance. Growth retardants act primarily to prevent gibberellin biosynthesis. These substances include: CMC, B, (longer than), Amo-1618, phosphine chloride-D (Foss-D), and auxin (regulatory).
3. Growth inhibitors. Unlike growth retardants, it mainly inhibits cell division in apical meristems, resulting in loss of apical dominance, increased lateral branches, and reduced leaves. It cannot be reversed by gibberellin. Such substances are: MH (Suppressant Dan), Dikaiguric acid, TIBA (triiodobenzoic acid), Chlordecyl (plastin), Glyphosate and the like.
4. Ethylene release agent. Synthetic ethylene-releasing compounds can promote fruit ripening. Ethephon is one of the most widely used. Ethephon is stable at a pNet of 4 or less. When the pH of the plant reaches 5 to 6, it slowly degrades and releases ethylene gas.
5. Defoliant. The defoliating agent can cause the release of ethylene and cause the leaves to senescence and fall off. Its main substances are tributyl trithiobutyrate, calcium cyanamide, cadmium, aminotriazole and the like. Defoliants are often herbicides.
Second, the application method
1. Spray. It is necessary to select a suitable field spray while mastering the appropriate period and the concentration of the registration. For example, when cotton is sprayed to adjust pyridine or ketamine, it is necessary to select a field that is relatively strong in growth of stems and leaves.
2. Point flowers. It is necessary to choose the potion and concentration to avoid high temperature spots. Especially when 2,4--D and anti-fallin are used for tomato and eggplant, the pigment is mixed in the liquid to prevent repeated flowering.
3. Dip. Pay attention to the relationship between concentration and the environment. When the air is dry, the amount of evaporation of the branches and leaves is large. It is necessary to increase the concentration appropriately, shorten the time of dipping, and prevent the cuttings from absorbing excessive amounts of chemicals to cause phytotoxicity. Pay attention to the cutting temperature. The rooting germination temperature is preferably 20~30 °C. Pay attention to the management of the cuttings. Inserts should be placed in a well-ventilated, well-drained sandy soil to prevent direct sunlight. Seeds can also be impregnated.
4. Watering. More at the end of the seedling period to cultivate strong seedlings and watering, or to increase the growth of roots during the growth period. For example, when the rice seedling stage is watered with sodium nitrophenolate at a concentration of 1 mg kg, it can promote Miao Qi and Miao Zhuang. Cucumber used in the melon period of 150 g / ha, can make the root system developed, increase the knot and extend the growth period. Pay attention to the dosage when pouring.
Third, matters needing attention
1. Choose the right dosage form. There are many types of plant growth regulators available on the market, mainly broad-spectrum type and special-purpose type. The broad-spectrum type can be used in a variety of plants, and the special type is limited to only one species or two plants. Be targeted.
2. Can not be used to replace the drug. Plant growth regulators are not a substitute for fertilizer and other agricultural practices. Even promoted plant growth regulators must have sufficient fertilizer and water conditions to function. Although some plant growth regulators add concentrated nitrogen, phosphorus, potassium and trace elements, they are rare in content and have little effect.
3. Grasp the concentration and number of uses. Excessive concentration of plant growth regulators causes thickening and embrittlement of the leaves, malformation or dryness and even death of the whole plant; if the concentration is too small, the effect will not be achieved. It should be flexibly controlled according to the variety of plant growth regulators, the purpose of application, the growth period of crops and their performance, weather conditions and other factors. Broad-spectrum plant growth regulation
The agent is generally sprayed 2-3 times, and the plant growth retardant is applied in a small dose; multiple spraying is preferred.
4. Do not use it for farming. Plant growth regulators such as ethephon and gibberellin are used for breeding crops such as vegetables, cotton, and wheat. Although they play a role in early maturity, they cause an increase in infertile ears and a serious decrease in seed germination rate. . Therefore, plant growth regulators should not be used for crops that are seeded.
This article URL: The types and applications of plant growth regulators
Evaporative Cooler Air Conditioners,Portable Air Conditioners,Air Coolers from Aircon Direct,Air Cooler with Water
Ningbo Shuangtuo International Trade Co., Ltd. , https://www.nbst-sports.com