Poplar cracking is a relatively common phenomenon. The frozen part is in the southwestern part of the trunk root, which is cracked upward from the ground and its height is about 1.6 meters. The shape is narrow and wide, and has a needle tip shape.
The poplar cracking period occurred from the middle and late November of the year (before and after the winter) and from the end of March to the beginning of April of the following year. Generally, more than 5 years of poplar age has more cracks. The reason for the freezing crack is firstly due to the large temperature difference between day and night. During the two periods from the beginning of the winter and from the horror to the Qingming, the temperature difference between day and night is large. Thermal expansion and contraction are formed in the trees. In these two periods, the southwest wind is often blown, and the wind is getting colder and the temperature is lower. Followed by the variety differences. Some fast-growing species are long and do not reach full lignification in the later stages of tree growth, thus making these varieties poorly resistant to cold. Once again, it is a sunburn, and the temperature is high at noon in spring and autumn. The temperature is low at night. Burning the southwest of the trunk is also an important cause of disease. Finally, the local area is low-lying, suffering from pests, improper management and management, making the tree grow weak, causing pathogens to invade, and is also the main reason for inducing poplar cracking.
Measures to control the freezing and cracking of poplar: choose a suitable variety for planting. The trunk is white, and the best period for whitening is mid-November. According to the ratio of white ash, clear water and salt 1:6:0.1, the solution was stirred and evenly left for 12 hours. When applying, use a brush to extend from the ground to 1.6-1.8 meters, focusing on the southwest of the root of the trunk. The white ash on the poplar reflects the sun and reduces the temperature difference. The salt has the function of keeping warm and antifreeze on the surface of poplar skin and preventing white ash from falling off.
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