Due to climatic reasons and improper cultivation measures, a large amount of defoliation early in the pear tree occurs. Early defoliation can weaken the tree vigor, affect the fruit development, reduce the yield and quality of fruit, and cause great economic losses to the fruit grower. The following five points should be taken in the prevention of early deciduous pear disease:
After adding organic fertilizer, the organic fertilizer will be applied early in the autumn fruit harvest, and appropriate amount of nitrogen, phosphate fertilizer and trace element fertilizer (calcium, zinc, iron fertilizer, etc.) will be mixed to effectively increase the fertilizer utilization rate. Organic manure must adhere to successive years of application in order to function well and improve the soil, increase organic matter, and prevent debilitating trees.
When the tree structure was highly densely planted, the branches were numerous, and the crowded and overlapping leaves were covered, the effective light-receiving area of ​​the leaves was reduced, the photosynthesis was blocked, the leaf assimilation and the assimilation amount were reduced, and the petiole wilted or the leaves turned yellow off. Through reasonable planting, reasonable pruning, reasonable load and other measures, we can establish a light-transmitting and light-transmitting tree structure, increase the utilization of light energy, and reduce defoliation. At the same time, the microclimate with ventilation and light transmission can enable the tree body to self-regulate, self-relieving, and self-relieving when it suffers from outside environment such as high temperature, rain, and humidity, so as to reduce the damage to the tree body.
A balanced orchard orchard should be filled with small water and often poured to prevent flooding. In particular, avoid flooding at high temperatures. At the same time, attention should be paid to water drainage in the low-lying areas to prevent accumulation of water. In the rain or after irrigation, should be timely scratching loose soil, keep the soil virtual reality: the upper loose, is conducive to the ventilation, water and nutrients decomposition, the lower soil is a little tight, can maintain water and fertilizer.
Orchard grass and grass grass cultivation can cultivate fertility, regulate the microclimate in the field, and reduce defoliation. The line promotes the cultivation of clover, alfalfa, ryegrass, etc. It is also possible to use the grass that grows naturally in the orchard. When the grass height exceeds 30 centimeters, cut it once and cover it with the grass. Cut 3 to 4 times a year. In the fall, the base fertilizer is deep-slipped once, or in the orchard line, the grass is turned into the soil. It is advisable to use less or no herbicides. If herbicides are used, they should be used before May to avoid the use of high temperatures in summer.
Spraying drug investigation found that the use of copper preparations and naphthalene acetic acid in the orchard defoliation situation is relatively light. Farmers can spray 1:1:200-250 times Bordeaux mixture 1 or 2 times in June to avoid rain and dew days. In addition, 45 to 45 days before harvesting, 25,000 to 30,000 times of glacial acetic acid is sprayed on the leaves, sprayed once every 15 days, sprayed 2 to 3 times, and the occurrence of defoliation can be effectively reduced.
Flood Bag,Alternative Flood Bags,Flood Barrier Bags,Quick Dam Flood Bags
Denilco Environmental technology(Suzhou)Co., Ltd. , https://www.wflood.com