Reasonably scrape and whiten. Both bark scraping and whitening can be done during the dormant period of the winter jujube in the greenhouse. The young trees are generally only whitened without scraping the bark before the trunk forms rough bark. The backbone branches of the tree form a thick layer of skin every year, which must be scraped.
Scraping is generally carried out with a special scraping knife, and it is required to scrape the rough cracked skin of the old bark to a degree, and not to scrape too deeply and damage the tender bark and xylem. When scraping the bark, spread newspaper or plastic sheet under the tree. The scraped bark must be cleaned up in time and burned together.
Heal scars and repair tree holes. In winter, it will often cause large cuts and cuts. If the tree is strong, the wound will heal quickly and generally will not cause problems. The tree is weak, because the wound area is too large and the healing time is long, which will easily cause the wound to rot and affect the tree. The growth and longevity of the wound should be protected. First, use a knife or a flat saw and cut the mouth to make the edges of the skin curved. Then use 2% copper sulfate or 5 Baume lime sulfur mixture to disinfect the wound, and finally apply a protective agent to prevent the wound from rot and promote Its healing. Protective agent uses tung oil, lead oil, wax, etc. The formula of wax oil is 800 grams of rosin, 100 grams of grease, 300 grams of gluten, and 500 grams of turpentine. The easiest way is to apply asphalt paint to the big wound.
Jujube trees often have "broken belly" phenomenon, or tree holes due to other reasons. When discovering such a situation, the fruit grower should fill the block in time to prevent the tree hole from expanding. The method of filling the hole is: clean out the rotten wood in the hole, scrape away the dead tissue at the edge of the hole, and then disinfect and fill the tree hole with a medicine. The filling is cement and small stone particles (1:3). mixture. Small holes can also be filled in with wooden wedges, which can protect wounds or accelerate healing.
Fertilize scientifically. For winter jujube gardens, if there is no fertilization in autumn, you should seize the winter fertilization season, fertilize well and fertilize enough to lay a nutritious foundation for soil cultivation, roots, and strong trees in the coming year. The fertilized varieties should be mainly organic fertilizers or refined organic fertilizers for sheep, combined with compound fertilizers, silicon-calcium-magnesium-potassium fertilizers and biological fertilizers. The number of fertilizers can be carried out according to the autumn fertilization plan, or combined with the strength of the tree. Provide sufficient nutrition for the healthy growth of jujube trees in the coming year.
Plastic trimming. Plastic pruning is to set up a good shelf to build the skeleton of the fruit for the winter jujube. Only when the shelf is set up can better results and more yield. The function of pruning is to cultivate the tree shape, balance the tree vigor, regulate the relationship between the vegetative growth and reproductive growth of the tree, regulate the growth and nutrient distribution of various branches in the bore, improve the ventilation and light conditions in the canopy, and promote the vigor of the tree. , So as to obtain higher economic benefits.
Do not buckle the shed too early. In the eastern part of Guanzhong, the suitable time to buckle the shed is early to mid-February. The shed is vulnerable to snow disasters and wind disasters early. At the same time, the lack of dormancy of winter jujube affects the differentiation of flower buds, and the jujube hangs and buds. When the minimum temperature is not lower than minus 2 degrees, the shed is most suitable. For greenhouses with thermal insulation equipment, the shed time should be 10 to 15 days in advance. Before detaining the shed, it is necessary to know the long-term weather conditions through the meteorological department. If the cold air activity is frequent, it is prone to "early spring cold" weather, and the deduction time can be delayed by 7 to 10 days.
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