What kinds of plant growth regulators are there?

What are the types of plant growth regulators? please brief us on Plant growth regulators are synthetic chemicals with hormonal activity. According to their effects on plant growth, they can be divided into three categories: plant growth promoters, plant growth retardants and plant growth inhibitors. Plant growth promoters: mainly include auxins (ABT rooting powder, indoleacetic acid, α-naphthylacetic acid, 2,4-dichlorophenoxyacetic acid, anti-falling element, etc.), cytokinins (6-benzylaminopurine), brassinosterol (brassinolide, epihomobrassinolide), gibberellin, chlorfenuron, calcium diphenylurea sulfonate, etc. Promote cell growth, play a role in increasing production, but also has the role of preservation and storage resistance. Plant growth retardants: mainly including paclobutrazol, uniconazole, chlormequat, brassinolide, zhuangfengling, vitalin, corn health element, ethephon, etc. It can prevent plants from overgrowth, form dwarf and robust plants, and resist lodging. Plant growth inhibitors: can inhibit the growth of apical meristem, including abscisic acid, bijiu, cystine, metanamine, triiodobenzoic acid, maleic hydrazide, etc. Control growth, inhibit flowering and bolting. In use, it should be selected according to the purpose. For example, in order to transplant roots and promote survival in transplanting and cuttage, 1000- 2000 mg/L indoleacetic acid or naphthylacetic acid solution can be selected, soaked for 15 minutes, and then transplanted and cuttage; to promote growth and yield, gibberellin can be selected, and the concentration varies according to crops. Spraying spinach with gibberellin solution at 4-6 leaf stage can promote leaf hypertrophy. Spraying cucumber with 50- 100 mg/kg at the time of female flower opening can increase fruit setting rate, accelerate fruit growth, promote early maturity and increase yield. 15-20 days before celery harvest, spraying with 50 - 100 mg/l gibberellin solution once can promote stem tenderization and cellulose reduction, and increase yield by about 30%. Coriander, Penny, Mustard, Vegetable, Fennel etc. can increase yield by 15%-40% when sprayed with 20mg/kg for 1-2 times 10-20 days before harvest (about 5 days apart). Spraying leaves with 10-20mg/kg at flowering stage of dwarf kidney bean could increase pod setting rate and early yield. Melons in the melon length of 11 cm with 20- 60 mg/L gibberellin solution spraying young melon, can promote melon rapid expansion; flower and fruit protection: can choose 2,4-D, anti-falling element, the use of concentration tomato is 15-25 mg/L, summer squash, eggplant, pepper is 20-40 mg/L; control vigorous promotion: can choose chlormequat, paclobutrazol. When the crops grow seedlings, spray 250-300 mg/L CCC solution 15kg per 100 square meters to treat seedbeds, spray 600-1000 mg/L CCC solution 50kg per mu to spray whole plants at seedling stage; induce female ripening: ethephon can be selected. When cucumber has 2-4 true leaves, spraying 20-50 mg/l ethephon, when pumpkin has 2-4 true leaves, spraying 150-200mg/kg ethephon can promote the early emergence of female flowers and increase the number of female flowers. At the initial stage of tomato coloring, spraying green ripe fruit with 2000-3000 mg/L ethephon can advance red ripening by 5-7 days; storage preservation: 2,4-D can be selected. Spraying 50mg/L 2,4-D solution 3-7 days before harvest to soak the outer leaves can prevent the top from falling off. Spraying cabbage with 100 mg/L 2,4-D solution 7 days before harvest prolonged the storage period by 90 days. Spraying outer leaves with 100 mg/L 2,4-D solution 3-5 days before harvest can prolong the protective time of outer leaves. Because of the strong pertinence of plant regulator, under the condition of small dosage and accurate dosage, the effect of increasing yield and improving quality is obvious. The dosage and method must be used according to the instructions for use or the test results. Arbitrary increase of dosage will not only fail to achieve the purpose, but will often lose more than gain. Gibberellin and chlormequat, paclobutrazol have mutual inhibition, can relieve each other of phytotoxicity. Click for more regulator application techniques Click for more pesticide application techniques