Paclobutrazol is a growth inhibitor used in the production of peach trees, which can effectively control the growth of peach trees and promote the formation of flower buds. However, the use of paclobutrazol for years has been too strong to inhibit the growth of peach trees, and it shows phytotoxicity. When phytotoxicity occurs, the peach tree branches can not grow longer, forming leaf branches, which not only affects the yield, but also affects the growth of the tree. How to manage after the occurrence of phytotoxicity? Please see the method below.
1. Increase the application of fertilizer water. The types of fertilization mainly include two categories, namely chemical fertilizers and organic fertilizers.
The use of organic fertilizer can mature the soil, slow down the soil compaction, increase the soil microbial species and activity, reduce the soil bulk density, and promote the growth of the tree, thereby reducing the paclobutrazol phytotoxicity. The amount of organic fertilizer used is 4,000 to 5,000 kg per mu. The method of application is ditch application, and the ditch is sloping to a ditch. The depth of the ditch is 25 cm. The organic fertilizer is applied into the ditch, and the soil is watered. The application time is in the peach fruit. After shrinking and shearing. The use of chemical fertilizers is mainly based on compound fertilizer. Nitrogen fertilizer can be added appropriately. Nitrogen fertilizer can promote the vegetative growth of peach trees and relieve the symptoms of paclobutrazol. The amount of compound fertilizer is 1/10 of the yield of peach fruit, and the proportion of nitrogen is compound fertilizer. 40% of nutrient content. In the germination stage, after the Xiehua, in the hard core stage, after the harvesting, the ditch is applied, and the ditch depth is 10-15 cm.
2. Spray gibberellin. Gibberellin is a hormone that promotes the growth of plants. It can promote cell division, promote the growth and thickening of peach branches, and alleviate the symptoms of paclobutrazol.
There are two kinds of gibberellin, which are alcohol-soluble and water-soluble. The water-soluble type is sprayed directly with water. The alcohol-soluble type needs to be dissolved by 70% alcohol or 60-degree white liquor, regardless of the gibberellin. The concentration used is the same, the normal use concentration in production is 5000 to 15000 times, the heavier the peach tree is affected by the paclobutrazol, the higher the concentration used, and vice versa. The spraying time is started when the peach shoots are contracted and the new shoots of the peach trees are difficult to rise and grow. It is worth noting that gibberellin also has side effects on peach trees, which are characterized by thinning of branches, long internodes, and thin leaves. It is difficult to form flower buds or flower buds, and it is difficult to form economic yield when severe.
3. Reasonable trimming. When the peach tree was found to be harmed by paclobutrazol, the amount of shrinkage of the peach fruit after harvesting was small, avoiding the slow growth of the branches due to over-pruning and paclobutrazol, and the phenomenon that the crown was too small to affect the yield.
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