Greening seedlings plays an important role in improving the ecological environment of the highway, ensuring the safety of driving, and beautifying the landscape of the highway. How to make the highway green seedlings safe for winter is an important task for highway afforestation managers. While doing a good job of winter irrigation, it is important to selectively select antifreeze and insulation measures for different plants and construction forms.
The wind barrier is on the expressway bridge section. In order to meet the clearance height under the bridge, the embankment is raised, often causing trees in the windward slope to be injured by freezing damage. A wind barrier can be erected on the windward side of the nursery stock with a stripe cloth or plastic cloth, which can increase the local temperature from 3°C to 5°C. This method can also be used for large seedlings such as toll booths and service areas.
To build a heat preservation shed, if the Euonymus japonicus is a ribbon shape and the area is large, the general cold protection measures are not ideal. According to the size of the area, bamboo batts and plastic sheets can be used to form a heat preservation arch shed. Pay attention to the insulation shed to be properly set up to avoid excessive temperature in the shed, excessive transpiration of seedlings and drought. For solitary plant Euonymus japonicus, a 95 mesh shading net can be used to protect against cold.
The trunk is coated with white antifreeze. For deciduous trees such as poplar, willow and sorghum, it is possible to use the trunk with white antifreeze. The whitening time is generally from late October to mid-November. Care should be taken not to delay the whitening time. If the temperature is too low, white coated materials will fall off. The white coated material can reflect the sun's rays to prevent the temperature difference from freezing and cracking the bark. The ratio of coated white material is water: quick lime: sulfur: table salt = 40:10:1:0.5. In order to prevent pests and diseases of mice, pesticides with a proportion of 0.1 to 0.2 that are not afraid of alkalis and have a long residual time can also be added. The whitening height can be from 1 to 1.6 meters, and it can be painted higher if conditional.
In addition, the management of spring seedlings should not avoid the premature and sudden removal of the cold-proof materials, and it is necessary to adopt a gradual and excessive approach to prevent the seedlings from adapting and the dangers of late frost, resulting in abandonment of previous efforts.
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