(1) Inhibit the growth of new shoots: CCC, B9, MH, PP333, plastic, etc. can replace the inhibitory pruning measures such as bud wiping, coring and twisting the shoots, so as to slow down the growth of branches and make short and medium branches blossom as soon as possible. High concentration (.5% ~ 1.%) of NAA can prevent the branches at the lower part of the cut from growing vigorously and sprouting when it is applied to the cut or saw cut in winter. In recent years, PP333 is widely used, which is 1 ~ 4 grams per plant (pure amount) when applied in soil, and the concentration is 5 ~ 2 mg/L when sprayed on the leaves. However, it should be noted that when sprayed repeatedly, the internodes of new shoots will be shortened too much due to the increase of absolute dosage, and the overlapping Ye Qun of "feather duster" will be formed, and the leaves will become brittle and turn green, which will lead to the decrease of photosynthesis. In severe cases, this situation can last for 2 ~ 3 years, and its inhibitory effect is difficult to remove. Therefore, the concentration and dosage must be moderate when using.

(2) Promoting lateral bud germination: In recent years, triiodobenzoic acid (TI-BA), chemical coring agent, cytokinin (BA, PBA), etc. are widely used, which can make lateral buds germinate and enlarge the branch angle. The method is to spray it in the long period of new shoots, and the concentration is 1 ~ 5 mg/L. In production, the main effective ingredient of Hairpin Ointment coated with lateral buds is BA.

(3) Reducing flower bud formation: Among gibberellin, GA3 can inhibit flower bud differentiation of apple, pear, peach, apricot, plum, cherry and other fruit trees, and after use, it can reduce the flower bud thinning operation in winter cutting. The spraying period is generally in June at the initial stage of flower bud differentiation, and the concentration is 5 ~ 1mg/L on peach trees and 45 ~ 2mg/L on apples and pears.

(4) flower thinning and fruit thinning: dinitro compounds, naphthylacetic acid, carbaryl and sulfur mixture have good flower thinning and fruit thinning effects, which can greatly reduce the manual thinning operation. The specific usage is that the period of spraying dinitro compounds on apples is from the full flowering stage to the flowering stage, and the concentration is 8 ~ 2 mg/L. The spraying period of NAA is flexible, with 4 mg/L for pear trees in full bloom and 1 ~ 2 mg/L for apples after full bloom. Carbaryl is widely used in apples, and it can be sprayed with 1 mg/L about two weeks after flowering. It is advisable to spray sulfur mixture on apples when the central flowers bloom and the edge flowers are just blooming, and the concentration is .2 ~ .4 degrees. Spray on peach trees twice in full bloom. However, it should be noted that in order to fully grasp the stability and safety of the hydrophobic effect of each drug before large-scale application, preliminary tests should be carried out first, and possible negative effects should be observed and investigated.

(5) improving fruit quality: soaking gibberellin GA3 in the ear of grape 1-2 days before flowering can induce seedless fruit, and soaking in the ear of grape about 1 days after flowering can increase the fruit size, with the concentration of 5-1 mg/L. Spraying plomarin with 1 ~ 25 mg/L (4 ~ 1 times of liquid) at the full flowering stage of apple can greatly increase the fruit shape index of most varieties such as Hongxing, Fuji and Jinguan. Apple Redner No.1 (produced in Baoji, Shaanxi) 2 times .3%KH2PO4 sprayed once 4 days and 2 days before fruit picking can obviously enhance the coloring, sugar content, pulp hardness and fruit surface smoothness of red Fuji and other varieties. In Japan, abscisic acid (ABA)5 mg/L was used to treat the fruit during the grape color change period, which can effectively promote the fruit coloring. In some countries, spraying TiBA 5 ~ 1 times solution, TTP8 times solution and UC-TTP5 times solution 2 ~ 3 days before apple ripening can promote defoliation and improve illumination, thus improving fruit coloring and quality.

(6) Regeneration and rejuvenation: Plasticine can weaken the apical dominance, strongly promote the germination of latent buds of branches and big and old branches, and achieve the purposes of restraining the upper part and promoting the lower part, renewing the branches, rejuvenating the tree, reducing the fruiting parts, and maintaining a high-quality and high-yield state. After being used on peach trees, the flower bud placement position can be pushed down to the base of branches, so as to promote the fruiting near the backbone branches, thus playing the role of shortening and retracting to control the outward migration of the fruiting parts.

(7) Other functions: Chemical regulation not only has the function of pruning measures, but also has the functions of promoting cuttings to take root, improving grafting survival, inducing parthenocarpy, early fruit ripening, preventing pre-harvest fruit drop and assisting harvesting operations, thus providing convenience for fruit tree cultivation and management.