How to protect navel orange orchard from freezing injury?

In rainy and snowy weather, navel orange orchards are prone to freezing injury and the temperature will decrease. It is imperative to do a good job in cold resistance of artificial forests, and many growers immediately implement emergency measures. Tap the trunk and long branches gently with a stick to shake off the ice cubes on the leaves, so as to avoid freezing injury caused by long-term contact of the ice cubes with the leaves, reduce the pressure on the crown and prevent the long branches from breaking. Be careful not to knock the branches and leaves at once, and you don't have to knock the trunk. If it snows in the middle and late period, cooling can also be done in this way.

Canopy Covering: Cover the whole canopy with hay or weeds. Adult trees can spread some sun screens on the canopy to cover weeds. Cover the tree tray tightly with hay or weeds. The thickness of weeds is above 10 cm, and some clods are pressed on them to avoid being blown away by the wind. Roots, heads and necks also need to be covered and loosened, leaving no gaps to raise the soil temperature.

The main pole is wrapped with grass: the main pole is all wrapped with hay, and the root and neck should be tightly wrapped to avoid freezing the main pole.

After the rain stops and the temperature warms up, it should be restored after freezing: cut off the cold leaves immediately; Shallow excavation and thin fertilization to promote plant type restoration; Immediately apply pesticides to prevent citrus anthracnose; Trim properly.

To prevent the three physiological diseases of navel orange, we should first choose varieties with strong crack resistance. Generally, varieties with oval fruit shape, small navel or closed navel have good crack resistance, such as Newhall. Secondly, we should improve innovation management and plant types. Especially in the dry period from rainy weather to autumn wind and autumn rain, it is necessary to do a good job in water management, ensure timely water injection or watering, maintain soil moisture and promote the normal growth of fruits. Spraying potassium fertilizer on the leaves for 2-3 times during the rapid fruit expansion period.

Covering orchards with straw and other solid soil is the basis to prevent sunburn; Planting green fodder or intercropping green manure crops in plantation can reduce sunburn; In high temperature season, it is not necessary to spray chemical fertilizers such as engine oil solvent and omethoate to prevent sunburn. In the early stage of sunburn, stick a paper towel on the sunburn, and involve branches to block the fruit and reduce direct sunlight.

Umbilical yellow disease starts with cultivating strong plant type, moderately topdressing basic fertilizer to improve the nutritional level and nutrition of tree stems; Secondly, before flowering, make the vigorous autumn shoots slack or horizontal, so that most flowers face down when opening to the outside world, reduce sunrise fruit and avoid navel yellow; From the middle and late July to the middle and late August, the navel of fruit was sprayed with 600 times of "Huang Zhi ester" aqueous solution to inhibit the occurrence and spread of navel yellow disease.