As a broad-spectrum and high-efficiency growth regulator, paclobutrazol is widely used in deciduous fruit trees such as peach, plum, apricot, cherry and apple, as well as evergreen fruit trees such as lychee, banana, mango and longan. How to use paclobutrazol on peach trees, paclobutrazol What time is it used in peach trees? The following article is for everyone to introduce.
How to use paclobutrazol on peach trees
The application method of paclobutrazol on peach is mainly soil application and spraying.
(1) Tu Shi
Ring groove soil application. Dig an annular groove 5 to 10 cm wide and 10 to 20 cm deep (to expose part of the absorption root) along the outer edge of the canopy or 1 m from the trunk. Dilute the desired paclobutrazol with appropriate amount of water and evenly pour it into the water. In the annular groove, if the soil is relatively dry, water may be added to soak the roots in the annular groove. The soil is restored.
Tree tray spray. Dilute the desired paclobutrazol with a proper amount of water and mix it evenly under the canopy. After the soil of the tree tray is dry, shallowly turn into the soil to contact the paclobutrazol with the roots of the canopy. Watering may be applied as appropriate according to the application period.
Root and neck soil. Drill an annular groove close to the trunk. The depth of the annular groove is to expose the roots and roots. The desired paclobutrazol is diluted with a small amount of water and evenly poured into the annular groove. The water content is suitable for soaking the roots at the root neck. . The soil is restored.
(2) Foliar application
Dilute the desired paclobutrazol to a certain concentration with a proper amount of water, and spray the new shoot growth point and new leaves evenly with a nebulized sprayer to make the leaves wet and the liquid to drip without falling.
The period of use of paclobutrazol on peach trees
Peach tree application of paclobutrazol is carried out before the peach tree branches are prolonged (the length of the new shoots is about 5 to 15 cm). The soil is applied in the early spring and late autumn to the two periods before the soil is frozen. In the early spring, before the germination (the peach in the flowering stage or the early stage of the germination also has a good control effect), the late autumn is applied after the fallen leaves of the peach tree until the soil is frozen. , can control the new year of the new year. Foliar spraying is carried out before the beginning of the peach tree branches to the late stage of the new shoots. The exposed peaches in the central region are generally from mid-May to mid-July. The fruit is banned within 1 month before harvest.
Paclobutrazol applied to peach trees
The dosage or concentration of paclobutrazol should be flexibly controlled according to the site, variety, age, tree potential and management conditions of peach trees.
(1) Soil application dose
Under the premise of ensuring that paclobutrazol effectively inhibits the growth of new shoots, according to the maximum residue limit of paclobutrazol in peach fruit is 0.5 mg / kg, the dose of paclobutrazol is generally applied according to the canopy projection area of ​​peach tree 0.075 ~ per square meter 0.15 grams of active ingredient (equivalent to 0.5 to 1.0 grams of 15% paclobutrazol), on this basis, increase or decrease as appropriate. The dosage applied to the viscous soil may be slightly heavier, and the application dose to the sandy loam soil should be slightly lighter. Appropriate application of strong trees, weaker trees should be applied less, and old and weak trees should not be applied. After applying the soil application method, the effect of the first year of application will be halved or reduced as appropriate in the second year. In the third year, according to the tree reaction, the average of the two-year application amount is generally taken, so that the wave is applied. It can make peach trees grow normally, produce high yield and stability, and not weaken the tree body, prolonging the age of results. It is usually applied once per growing season.
(2) Foliar spray concentration
According to the standard of paclobutrazol in peach fruit not exceeding 0.5 mg/kg, the paclobutrazin foliar application concentration is between 500 and 1500 mg/l under the premise of ensuring the effect of paclobutrazol. Use lower concentration (500 ~ 750 mg / liter), peach can be used 2 to 3 times per growing season; use medium concentration (750 ~ 1000 mg / liter), no more than 2 times per growing season; use higher The concentration (1250 ~ 1500 mg / liter), the open floor peach is used up to 2 times per production season, and the facility peach is used up to 1 time per production season. When spraying two or more times, the interval between the two times is 15 days or more.
How to use paclobutrazol on peach trees, the use of paclobutrazol on peach trees, Xiaobian introduced this to everyone, reminding farmers that paclobutrazol is more common in juvenile peach trees and high-density peach gardens. The rational use of paclobutrazol in peach trees can basically eliminate summer pruning, reduce the workload of winter pruning, promote flower bud differentiation and increase yield.
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