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.