How do orchids usually overwinter?
First, it is the key to stop nitrogen and topdressing phosphorus and potassium: because nitrogen fertilizer can increase chlorophyll, make leaves tender and have poor stress resistance; Phosphorus fertilizer can regulate the metabolic process of crops and participate in the metabolism of sugar, nitrogen-containing compounds, fat and so on. Shorten the development period, increase the sugar content of plants, reduce the freezing point of plants and enhance the frost resistance; Potassium fertilizer can improve the intensity of photosynthesis, promote the metabolism and synthesis of carbohydrates, increase lignin and fiber in plants, promote the toughness of stem and leaf epidermis, and thus enhance cold resistance. Generally speaking, from the beginning of the "Bailu" solar term, every half month, 0.2 g of cooked broken bone powder is sprinkled on the plants and poured with 1500 times of liquid potassium sulfate; On February 9th, every evening, 800 times of potassium dihydrogen phosphate and 0/00 times of potassium dihydrogen phosphate/kloc were used for foliar spraying. 165438+1Stop fertilizing in the middle of October. ?
Second, it is very important to control water and increase light: after dormancy, the physiological activities of orchids slow down and the water demand of plants decreases. The topsoil is not watered and there is no dry white crack; Even if you water it, you should choose sunny days and spray some water a little, with the principle of "dry but not wet". After water control, under the transpiration during the day, the free water of plants is reduced, the sugar is concentrated, and the bound water is increased, thus reducing the phenomenon of freezing inside and outside cells. From now on, increase the amount of light to make the photosynthesis of plants have enough energy, thus increasing the accumulation of organic matter in plants, and enabling them to hydrolyze starch in plants into water-soluble sugars under the condition of long night and low temperature, so as to enhance the water-holding capacity of cells, reduce the freezing point of cell fluid and cytoplasm, and thus improve the cold resistance. ?
Third, reducing consumption is essential: unnecessary natural consumption of plants will reduce the cold resistance, and the buds in late autumn and early winter should be removed in time. Because in the alpine region, these tender buds in late autumn and early winter develop slowly and often freeze to death. If there are too many buds, they should be removed properly. Pests and diseases should be put out in time to avoid or reduce unnecessary consumption of plant nutrients and reduce frost resistance. ?
Fourth, don't forget emergency protection: whether or not measures are taken to improve cold resistance, freezing should be prevented in time. First, pay attention to the weather forecast, and dry orchid plants ten days in advance to prevent sudden freezing of low temperature and wet substrate. It can be used to increase foliar spraying and spray a little water on the plant base to make up for the water shortage caused by bias. Second, for a small number of babies, it is necessary to move indoors or to a place where the northwest wind is impenetrable; In cold areas, it is necessary to move into a greenhouse or use a sandwich heating and insulation device for protection. If planted on the ground, it should be arched at the top of the border and sealed with thick plastic sheets; In cold areas, add an arch to the arch, seal one or two layers of plastic sheets, and hang light bulbs to dissipate heat and enhance heat preservation. Third, for those who can't take protective measures in advance, they can immediately raise seedlings, move them indoors, put them vertically, and bury their roots with slightly wet sand to ensure the safe overwintering of orchids.
reference data
Encyclopedia of China:/z/nong/hh/795486.html.