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10 measures for anti-freezing of citrus fruit trees

In order to prevent sudden low temperature and cold wave, try to reduce the degree of freezing damage of citrus. In winter, the following measures can be taken to prevent freezing.

1. Choose a suitable microclimate environment for the construction of the park

The cultivation of citrus on the slopes of Qiulin should choose the southern slope of the shelter from the wind; the flat garden should be built with windbreaks in the east, north and west of the orange garden. The wind-proof forest can be used for evergreen trees such as camphor and privet.

2. Choose citrus varieties with strong cold resistance

Citrus genus - citrus subgenus evergreen fruit tree, its variety, the difference in cold resistance between varieties is also very large. Among the citrus varieties that have been planted locally, the cold resistance is from strong to weak: Wenzhou mandarin, Nanfeng tangerine, ponkan, navel orange, orange (hybrid orange and orange), pomelo. When planting selected varieties, navel oranges, oranges and pomelo cannot be developed in large areas.

3. Timely application of base fertilizer

The time for the citrus application of the base fertilizer should be completed locally from late October to mid-November. Too early to promote the late autumn bud, consumption of nutrients to reduce the cold resistance of the tree, too late due to low temperature is not conducive to root wound healing.

4. Irrigation in the garden

Into the middle and late November, the citrus began to be filled with water, and the soil in the garden should be kept moist in the absence of rain in winter. According to the weather forecast, refill the water once every 3-5 days before the cold wave.

5. The main pole of the plant is coated with white soil

The main pole is whitened with 30-40% lime liquid, and the ground plant and the grafting interface of the rootstock are soiled, and the soil pile is more than 30 cm high. Applying white soil can reduce the degree of damage caused by melting snow and the occurrence of post-freezing crack disease.

6. Spray steaming insulation agent

Spray the entire canopy once every 5-7 days before the cold air comes with 200 times of anti-steaming agent. Repeat the spray immediately after the cold wave.

7. Crown cover

When the minimum temperature drops below zero, the canopy is covered with a non-woven fabric or plastic film. When the cold wave turns fine, the cover can be uncovered when the temperature is above 5 degrees Celsius, and the frost is covered at night. In the case of conditions permit, simple plastic greenhouse insulation can be built before the end of November.

8. Clear the canopy snow

When encountering heavy snow, shake the canopy branches in time to shake off the snow on the crown to prevent the snow from breaking the branches.

9. The ground sprinkled lime

In the evening after the snow, the acres in the orange garden are sprinkled with 50-100 kg of granular lime. Quicklime can increase the temperature in the garden by decomposing the emitted gas and reduce the harm of radiation cooling.

10. Use antifreeze candles.

Before the advent of the cold wave, prepare a large number of antifreeze candles for the fruit trees to keep out the cold. This is not only the antifreeze method used by Chinese fruit tree managers. More and more foreign orchard managers prefer this approach. Because foreign populations are scarce, labor costs are relatively expensive, and this approach just reduces labor and reduces the cost of antifreeze in orchards.

antifreeze candles


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