In winter and spring, the temperature is low, and citrus young trees are vulnerable to freezing damage. Light flower buds are frostbite, branches are dried, and deciduous leaves are severely degraded. The yield and quality of fruit trees are seriously degraded. In severe cases, the dry skin of the branches will be frozen and even frozen. The following examples of effective antifreeze measures are introduced. .
The orchard covers the rows of straw, weeds, leaves, etc., which can protect the sputum and maintain and improve the ground temperature.
7 to 10 days before the irrigation and freezing protection, the orange trees are filled with water, and the water is stored in the water to reduce the temperature difference, so that the ground temperature during the freezing period is relatively stable, thereby reducing the freezing damage. It is good to carry out irrigation at noon, and it is better to infiltrate in the evening.
Timely soiling and frosting before the combination of fertilization and a soil cultivation can effectively avoid the freezing damage of the root base and the trunk, and the soil is better with turf soil or soil. Each soil depends on the size of the canopy. The soil should be applied to the upper part of the neck, usually about 15 cm. If covered with a mulch film, the film edge is pressed with soil pressure to prevent heat loss and being blown by the wind. After the low temperature has passed, the soil above the root neck should be opened in time to prevent rotten roots and pests.
When the tree is wrapped in low temperature, the main branches of the trunk are tightly wrapped with straw, which can effectively prevent the cold current from invading.
After protecting the canopy and clearing the frosty "big snow", the fruit branches are often piled with frost, which not only makes it easy to crush the fruit trees, but also causes freezing damage. Therefore, the frost on the branches should be cleaned up in time. If conditions permit, cover the orange garden canopy with bags, straw, etc.
When the trunk is painted in a white orchard in the winter, the main branch of the main tree is painted white. The formulation of the whitening agent is: 2.5 kg of quicklime, 0.75 kg of sulfur powder, 1.25 kg of salt, 0.1 kg of vegetable oil, 0.05 kg of soybean flour, and 18 kg of water. In the preparation, the quicklime and the salt are respectively dissolved in hot water, and the mixture is fully stirred into a paste, and then sulfur powder, vegetable oil and bean flour are added, and then water is exchanged and stirred uniformly.
Cut off late autumn shoots, late autumn leaves, thin color, less accumulation of organic matter, low concentration of cell liquid nutrient concentration, easy to freeze damage, resulting in defoliation.
Spraying hormones and oil to keep the leaves from freezing. In the middle of December, spray 80 times of liquid oil emulsion before the cold wave. Small citrus trees can properly dilute the oil to prevent phytotoxicity. Spraying naphthalene acetic acid solution in early spring can delay the flowering period of fruit trees and avoid the harm of fruit trees in early spring. The concentration is 10ppm, it should be dissolved in warm water first, then mix well with plenty of water.
Smoked anti-freezing fuel is better with sawdust and weeds. When the cold wave comes, it will ignite and let the smoke cover the whole garden. In addition, set up a wind barrier to create a windbreak. Wind-proof forests can be set around the orange garden, and the bamboo forest in the surrounding garden can also be planted to reduce the wind speed to achieve the cold-proof effect.
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