1 Whitening In winter, due to sudden changes in the temperature of hot and cold, the sunny side of the trunk and big branches is directly exposed to the sun during the day. The temperature rises and the tree absorbs heat. At night, there is no sharp decline in the temperature of sunlight, and the tree emits heat, making the bark The phenomenon of freezing and desiccation appeared after the organization became too late to adapt. We called it sun burning. After the hazelnut tree is whitened, it is conducive to the reflection of sunlight, so that the direct sunlight heat can reflect a part of it, so the temperature of the tree body will not rise quickly, the temperature change is relatively stable, and the situation of freezing and thawing is reduced, which can reduce or avoid Sunburn, while the trunk is coated with white, can eliminate a variety of pests that overwinter in trunks and cracks. The proportion and method of preparation of whitening agent: 10 parts of water, 3 parts of quicklime, 0.5 parts of salt, and 0.5 parts of sulfur powder. First use lime to dissolve the water, filter out the glutinous rice, pour the dissolved salt, and finally mix the sulfur powder. Salt from the deliquescence effect, can be coated and cracked off, sulfur powder can kill bacteria and overwintering eggs. The whitening effect is better when applied twice a year. The first time after deciduous till the soil is frozen, the second time in the early spring, when the whitening is applied, the temperature should be above 2°C to prevent freezing from becoming ice. The whitening liquid should be dry and thin, and should not be lost when brushing. When it is used, evenly apply on the trunk and large branches with a brush, and apply at the bifurcation.
2 The root system of newly planted hazelnut trees in rhizomes was relatively underdeveloped in the past few years, and its stress resistance was weak. Once frost damage occurred, it affected the trees a lot. In the second year of spring, the growth was not good, and heavy springs died. In order to avoid or reduce the occurrence of freezing damage, we should cultivate the roots and stems in the rhizome to create a relatively small environment for conservation and heat preservation. Specifically before the winter in the trunk of the roots can also be carried out in September when the weeding time, soil does not need to be too much, too high, 15-20 cm on it, the earth's hole surface 40-60 cm. Note that when taking soil, the tree should be spaced farther away from the root of the hazel tree to avoid injuring the roots or leaving the roots exposed.
3 After pouring frozen water into winter, the hazel tree begins to sleep and the nutrient component begins to flow back from the tree to the root. In this case, filling the frozen water in the hazelnut garden will allow the soil to store enough water to prevent spring drought and increase soil temperature. Satisfies the slight transpiration of the hazelnut tree, but also can improve the wintering ability of the tree, reduce hazelnut tree frost damage and the occurrence of drawing.
Specific methods: Before soil freezing (usually around mid-October), the tree tray should be filled with water to make it suitable for the soil to penetrate the soil with 50-100cm. There are many methods for irrigation, but it should be based on the principle of “convenience, water saving, and high efficiency†and adapt it to local conditions. Below I introduce to you several ways:
(1) Furrow irrigation: Dig 25 cm deep shallow ditch between rows and fill the water along the ditch. The distance between the ditch and the tree is 1 m. Fill the ditch after irrigation. The advantages are better soil soaking, less water loss and less soil consolidation.
(2) Pan irrigation: With the trunk as the center, round tree trays are built according to the tree crowns.
(3) Gully irrigation: Dig a circular ditch at the vertical projection of the tree crown to introduce water.
(4) Cave irrigation: Dig a few 20 cm wide and 30 cm deep caverns in the tree tray. Then fill the hole with water and allow the soil to recover after the water seeps. This method saves water and is suitable for mountainous areas.
(5) Sprinkler irrigation: With the electric sprinkler, water is evenly sprayed into the air through the sprinkler to form drizzle irrigation.
Note that irrigation and freezing water depends on the size of autumn rain, soil moisture and other factors. Pay attention to flexibility when filling.
4 Sprinkler irrigation plant antifreeze Before and during the early winter cold haze canopy spray and tree root antifreeze can also be properly avoided frost damage and smoking. The specific usage and antifreeze principle are detailed in each brand's instruction manual.
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