Plant growth regulator is a kind of substance which has the activity of plant hormones and is synthesized by artificial imitation of plant hormones or extracted from microorganisms.
In terms of efficacy, it can be divided into several categories: the first category is plant growth promoters, common are gibberellin, naphthoacetic acid, brassinolide, ethrel, etc.; The second class is plant growth retardants, such as dwarf, multicolor, fluronidine, etc. The third category is plant growth inhibitors, such as chloroaniline, abscisic acid, and budan. And then there's the preservative.
2, 4-D: Chemical name of 2, 4-dichlorophenoxyacetic acid, is a white diamond crystal, soluble in alcohol, ether, ketone and other organic solvents, almost insoluble in water. In practical applications, the 2, 4-d at 300 parts per million of low concentration, can be used as plant growth regulator, used to prevent falling flowers, such as tomatoes, cotton, pineapple fruit drop and form no fruit, while in more than 500 PPM concentration for stem leaf processing, can be in crops of wheat, rice, corn, sugar cane field control quinoa, amaranth and broadleaf weeds and bud gramineous weeds, is a kind of selective herbicides. 2, 4-D emerged in the 1940s as the world's first selective herbicide, playing an important role in the field of herbicides.
Chlorfenuron: a benzourea plant growth regulator with cytokinin activity, invented by Professor Shou Teng of the Department of Pharmacy, University of Tokyo, and developed by Japan Union Fermentation Industry Co., LTD. In 1980, under the approval of the Japanese Plant regulator Research Association and under the name of KT-30, Concorde fermentation began nationwide effect tests in Japan. It was later introduced into China. Widely used in agriculture, horticulture and fruit trees, promote cell division, promote cell expansion and elongation, promote fruit mast, improve yield, mainly used in cucumber, kiwifruit, loquat, grape, melon, watermelon and other vegetables and fruits.
Gibberellin (gibberellin) a plant growth regulator that promotes stem and leaf elongation, plant height, seed germination, and flowering. Used for potato, tomato, rice, wheat, cotton, soybean, tobacco, fruit trees and other crops to promote their growth, germination, flowering and fruiting; It can stimulate fruit growth, increase seed setting rate and increase yield of rice, cotton, vegetable, melon and fruit.
