Paclobutrazol plant growth retardant, its morphological effect is to delay the longitudinal elongation of the crop, enhance lateral growth, increase tillering or branching, stem thickening, plant dwarfing and compact; physiological effect is to increase the content of chlorophyll, protein and nucleic acid , Reduce the content of gibberellins in the plant, but also increase the release of ethylene and reduce the content of indole acetic acid. Now the application of paclobutrazol in peach is described as follows: Application time. Wang Chang peach trees can be applied to the soil in the spring flower bud expansion period, early application of early efficacy, in order to control the growth of new shoots, improve the fruit setting rate. The moderately growing peach trees are used to control the shoots and growth of shoots after they have grown vigorously during the growth period (about 20 cm in length). Phyllostachys edulis can be used to spray 500-1000 mg/kg paclobutrazol on trees in August to increase flower bud quality. When applying pesticides, it should be noted that 1-2-year-old saplings and weakly growing trees should not be applied. Application amount. The application amount is mainly determined by factors such as the age of the tree, the strength of the tree vigor, the size of the canopy, and the type of the seed. Wangshu and big trees should be applied in multiple ways, but vice versa, yellow-fleck peaches in late-type gold and yellow dew should generally be used 10-20% less than those in southern honeydew and Okubo. For the first application, 0.50 to 1 g (approx. 15% paclobutrazol WP product volume) of the canopy projection per square meter was applied. Soil application has a significant effect for 3 years, with the most significant effect in the first year and decreasing thereafter. How to apply pesticides in the second year should be determined according to the growth and development status of peach trees: After the first year of application, the middle and long fruiting branches formed by peaches account for about 30% of the total branch weight, and a small amount of secondary branches are pumped. . It shows that the application amount is appropriate, and that the application amount in the next year is about 50% of the application amount in the previous year; if the percentage of medium and long fruit branches that are pumped on the peach tree is large, more and more vigorous secondary Branches indicate that there was less application of pesticides in the previous year, and the amount of pesticides applied in the following year should be more than 60% of the previous year's application rate; if the results of the pumping were many short fruit branches, fruit-like fruit branches, medium and long fruit branches Weak and sagging, indicating that the application amount is too large, should not be applied or less applied in the next year. If the application amount is too large, the peach tree will be inhibited from growing too much. It is necessary to find it early and spray 50 mg/kg of gibberellin in time to reduce its inhibitory effect. Application method. It has been proved by most experts that paclobutrazol has the best effect in soil application. The method is to dig an annular groove with a depth of 10 cm and a width of 30-50 cm inside the outer edge of the canopy projection, diluting the agent with water to 1000-2000 times, and then evenly spraying the medicinal solution. In the annular groove, the soil is covered with water. During the spraying process, it is necessary to constantly stir and mix the liquid medicine to prevent precipitation, resulting in uneven application and affecting the effect after application. It is also possible to excavate the ring ditch according to the above method, mix the powder with fine soil, spread evenly in the ditch, mix well with smashing and hoeing, and water after covering the soil. Management after application. After paclobutrazol was applied on peaches, flower buds increased, fruit setting rate increased, and yield increased. Therefore, it is necessary to strengthen soil, fertilizer, and water management to meet the needs of its growth results. When pruning in winter, it is necessary to adjust the amount of flowers, and appropriately increase short and short cuts, and eliminate short and thick fruit branches and fruit-like fruit branches. After fruiting, fruit thinning should be carried out to adjust the amount of results so as to prevent excessive results, affect the quality of fruits, weaken the tree vigor, and accelerate the aging of peach trees.
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