Pacloplanium growth regulator , its morphological effect is to delay the longitudinal elongation of crops, enhance lateral growth, increase tillering or branching, stem thickening, plant dwarf compact; physiological effect is to increase the content of chlorophyll, protein and nucleic acid To reduce the content of gibberellin in the plant, it can also increase the release of ethylene and reduce the content of indole acetic acid.
[Training time] The long-peach peach tree can be applied to the soil during the spring flower bud expansion period, and the early application of the effect can control the growth of the new shoots and increase the fruit setting rate. The moderately growing peach tree is applied after the Xiehua new shoots (the new shoot grows about 20 cm long) to control the occurrence and growth of the two branches. The moderately weak peach tree can be sprayed with 500-1000 mg/kg paclobutrazol on the tree in August to improve flower bud quality. When applying the medicine, it should be noted that 1-2 year old saplings and weak growing trees are not suitable for application.
[Applicable amount] The dosage is mainly determined according to the age of the tree, the strength of the tree, the size of the canopy, and the type of the variety. Wangshu, big trees should be applied more, on the contrary, less applied, late yellow, yellow dew and other varieties of yellow meat peaches should generally be 10-20% less than the southern honey peaches such as Shanghai honey, Okubo and other varieties. For the first application, 0.50-1 g per square meter of crown projection (refer to the amount of paclobutrazol WP containing 15% of active ingredient).
After applying the soil for 3 years, it has obvious effects. The effect in the first year is most significant and will decrease in the future. In the second year, how to apply pesticides should be determined according to the growth and development of peach trees: after the first year of application, the medium and long fruit branches formed by peach trees account for about 30% of the total branches, and a small number of secondary branches are taken. . Explain that the amount of application is appropriate, the amount of application in the next year is about 50% of the amount applied in the previous year; if the proportion of medium and long fruit branches on the peach tree is large, it will be more and more vigorous. The branch indicates that the application in the previous year is less, and the dosage of the next year should be more than 60% of the amount applied in the previous year; if the result of the pumping is mostly short fruit branches, bouquet-like fruit branches, medium and long fruit branches Weak and drooping, indicating that the amount of application is too large, and should not be applied or applied less in the next year. If the application amount is too large, the peach tree will be inhibited from growing too much. It should be detected early, and 50 mg/kg of gibberellin should be sprayed in time to reduce its inhibitory effect.
[Method of application] It has been proved by most experts that the application of paclobutrazol in soil has the best effect. The method is to dig a circular groove of 10 cm in depth and 30-50 cm in width on the inner side of the outer edge of the crown projection, and dilute the medicament into 1000-2000 times of the liquid medicine, and then evenly sprinkle the prepared liquid solution. In the annular groove, the soil is covered after the water has been infiltrated. During the application process, the prepared liquid should be constantly stirred to prevent sedimentation, resulting in uneven application and affecting the post-application effect. You can also excavate the annular groove according to the above method, mix the powder with fine soil, evenly spread it in the ditch, mix well with sputum and sputum, and cover the soil and then water it.
[Management after application] After the application of paclobutrazol in peach trees, the formation of flower buds increased, the fruit setting rate increased, and the yield increased. Therefore, it is necessary to strengthen the management of soil, fertilizer and water to meet the needs of their growth results. In the winter pruning, the amount of flowers should be adjusted, and the short cuts should be appropriately added to remove the short and weak branches and bouquets of fruit branches. After fruit setting, fruit thinning and adjustment of the results should be carried out to prevent excessive results, affect fruit quality, weaken tree potential, and accelerate the aging of peach trees.
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