Timely support. Due to the frozen rain and snow conditions, 10-15 mm ice layers are formed on the branches and leaves of citrus trees, and the load on the tree body is increased, which may cause chapped branches. Therefore, they should be tied with ropes or supported with other supporting materials in time to prevent them. Cracked. Be careful not to shake the ice and snow on the trees with human, otherwise it will cause a lot of leaves to fall off.
Orangery smoked. The days of clear blue sky after snowfall ceased, and low-temperature radiation frost-fishing at night was the period when citrus was most likely to cause severe freezing damage. Therefore, to pay close attention to the weather forecast, on sunny nights, especially in the middle of the night, pile up smoke in the orange groves to produce a lot of smoke, increase the temperature of the orange groves, and prevent radiation frost. In advance of the orange groves, especially on the low slopes of the slopes, a smoked stack (weeds, sawdust, husks, branches, etc.) is prepared every 30 to 50 meters to ignite smoke at night.
Canopy cover grass. For instance, after the snow meets fine weather, it should cover some thatch and straw as much as possible in the canopy, so as to prevent the tree from being exacerbated by excessive temperature rise. Focus on the protection of young trees and autumn seedlings.
Spray steamer. After the snow, in order to prevent excessive evaporation of leaf moisture, the steam curtains can be sprayed with the "6501" and "OED" as well as the "fruit berry" in the canopy of the canopy to reduce the loss of leaf cells and maintain normal physiology. Features.
Ditch drainage. After the snow is turned on, it is necessary to drain the trenches in the Orangery in time to reduce the soil moisture content, improve the ventilation conditions, and prevent root and root diseases from occurring.
Spray and prevent disease. After spraying, the fungicide should be sprayed on the canopy in time to prevent anthrax, resin disease and other hazards. The agent can be used 50% carbendazim 800 times, 70% thiophanate-methyl wettable powder 800 ~ 1200 times or Bordeaux mixture (copper sulfate: lime: water = 0.5: 1: 100) or Baume 0.3 Degree of lime sulfur, spraying after the weather has changed. For trees with heavy freezing, it is also possible to use cow dung and yellow mud mixture (fresh cow dung 60% to 70%, yellow mud 29% to 30%, lime 5% to 10%) after the weather improves. %, a small amount of hair and the appropriate concentration of one millionth of 2,4-D liquid into a paste Serve the sticks, can also be used butter (2% added thiophanate or carbendazim) smear In early July, whitewash and prevent sunburn. Whitening agent formulation: 5 parts of lime, 1 part of lime sulfur cocktail (or 0.5 part of sulfur powder), 0.1 part of salt, 0.1 part of tung oil and 20 parts of water. For example, adding pesticidal and bactericidal pesticides at a proportion of 0.5% to 1% in the formulated whitening agent has the effect of controlling pests.
Timely fertilization. Spring fertilizer should be applied as early as possible to promote the germination and robust growth of new shoots. The first spring fertilizer should be dominated by available nitrogen fertilizer. The second spring fertilizer plus an appropriate amount of superphosphate, in order to speed up the tree potential recovery, in addition to soil fertilization, but also combined with foliar fertilizer, available 0; 3% to 0.5% of urea plus 1% to 2% of superphosphate Calcium and 4% ash leaching solution was used for extra-root dressing.
Correctly trimmed. Try to keep the leaves that haven't frozen and do not remove them easily. The dead orange leaves were promptly removed. After the frozen dead shoots were determined to be frozen, the dead branches (dry) were immediately cut (saw), and the cut (saw) mouth was selected on a healthy part. Pruning should be treated differently depending on the degree of freezing citrus trees:
Light-frozen trees (1 frost damage): Lightly pruned after spring temperatures rise, keeping green branches as much as possible. Frozen trees (2 to 3 cold damage): When the boundaries of life and death of frozen branches are determined in the spring, the moderately renewed pruning can be performed at the buds where sprouts are sprouted. The technical methods are as follows: It is determined that the cut and saw parts should be reshaped from the whole tree in order to facilitate the cultivation of high yield new crowns. Re-frozen trees (4 frost damage): generally cut on large stem branches, equivalent to old tree bare bone updates (Citrus 1 to 5 frost damage standards see the newspaper No. 3428 6th edition "to be timely care of frozen orange trees" Article - editor's note).
After cutting (saw), smooth the cut (saw) mouth and frozen wound, then sterilize the wound with 75% alcohol or 0.1% potassium permanganate, disinfect and then apply the wound with cow manure and yellow mud mixture.
Thinning and thinning fruit. The orange trees that suffered a lot of defoliation due to freezing injury often spend too much, but they are too numerous to spend, there are many flowers with abnormal shapes, and the fruit setting rate is low. In the spring, some of the resulting mother branches and flowering branches with low fruiting rate should be thinned to reduce flowering. Volume, while sparsely deformed flowers and obsolete flowers. After the physiological drop has stopped, excessive fruiting should be carried out in the middle or late July. Too much shoot buds should be erased in time.
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