How to prevent banana freezing injury?

What is the cause of banana freeze injury? How to prevent and cure banana frost injury? Also ask experienced netizens to help introduce bananas as a staple food in some tropical areas, and contain a variety of trace elements and vitamins, which can enhance the body's resistance to diseases, effectively promote appetite and aid digestion. However, banana planting is often affected by frost injury, which seriously affects the value and economic benefit of banana. Therefore, the farming network sorted out the causes and prevention methods of banana frost injury, which are listed in detail below for netizens' reference. 1. The causes of freezing injury in various producing areas of bananas: 1. Freezing injury in Guangdong and Guangxi mainly occurred in Zhanjiang, Xuwen, Maoming, Gaozhou, Dongguan, Huizhou and Guangzhou in Guangdong, while Guangxi mainly occurred in Wuming, Chongzuo and other places around Nanning. Because the cultivation topography of banana in Guangdong and Guangxi is mostly mountainous and hilly, red loam, which is greatly affected by the cold current in the north, the Siberian cold current meets the warm and humid air flow in the South Pacific from mid-November to February every year, forming a continuous low-temperature overcast and rainy weather. The frost injury on bananas in Guangdong and Guangxi showed that the stems, leaves and banana fruits blackened, the whole plant died, the whole plant died, sometimes even attracted and completely froze to death, and rotted and stinked after the weather cleared, affecting the management of remaining buds in the second year, resulting in a loss of yield. The low temperature freezing injury of banana in Guangdong and Guangxi is shown as follows: during the period of low temperature, the growth of banana almost completely stops, the root system declines or dies, due to the inability to effectively supply fertilizer and water, the leaves are stacked together, the new leaves are often weak, and the leaves are yellowing and missing. There are serious symptoms of de-fatting, and the extracted bud is small, the fruit axis and fruit finger are short, and can not develop normally. The symptom of incision pseudostem is yellowing of vascular tissue, which is like bacterial soft rot, which is caused by cell damage caused by low temperature and cold rain stress. 2. Yunnan bananas are mainly planted in the states and counties near the border in Honghe, Xishuangbanna, Pu'er, Baoshan and Dehong in the south. Most of the bananas are mountainous, and most bananas are cultivated on the platform. As Yunnan has many alpine valleys and rich vegetation, it has a strong ability to adjust temperature and a lot of microclimate. The typical climate of Yunnan is high temperature and rainy in summer and autumn, low temperature and drought in winter and spring. Yunnan is located in the Yunnan-Guizhou Plateau, with a high altitude, far away from the sea and high mountains, so Yunnan is rarely affected by the warm and humid air flow in the South Pacific, and its rainfall is mostly caused by forest evaporation. At the same time, the cold current from Siberia can not reach the plateau and has little impact on Yunnan. The low-temperature cold snap in Yunnan has many reasons for the snow-capped mountains on the Qinghai-Tibet Plateau, and its conventional path is to go all the way south along the Ailao Mountains and the Red River Valley to the estuary area, which has a great impact on the surrounding flat terrain areas such as Honghe Prefecture and Xishuangbanna. Because the low temperature weather in Yunnan generally does not cause rain, and it is mostly dry and cold weather, except for some mountains with an elevation of more than 600 meters, there are few extremely low temperatures in the mountain banana planting in winter, making the bananas freeze to death completely. therefore, Yunnan mountain bananas are generally able to survive the winter smoothly, mainly to produce spring bananas. As most of Yunnan bananas bud from October to November, the weather of fruit development is often low and dry, and the temperature at night in winter can be as low as 5 degrees Celsius, and during the day, the temperature can quickly rise to 25 degrees Celsius. The main freezing injury caused by low temperature in Yunnan banana is as follows: yellowing of banana leaves, small bud, short fruit axis, short fruit finger, and fruit development period of more than 4 months. The cold of mountain banana fruit showed that there were water-stained spots on the pericarp and sporadic black spots in the vascular tissue of the torn epidermis. Second, the causes of banana freezing injury: 1. Because the transport of banana nutrients from banana roots to leaves can only be completed by transpiration pull, in low temperature environment, the leaves almost have no transpiration, so nutrients can not be transported. The new leaves are yellowing and missing. 2. Budding in banana requires a large amount of energy supply, and can only be completed at higher temperature. Low temperature makes the supply of mineral nutrients and carbohydrates needed for bud development and fruit axis elongation. Therefore, the bud is small, the fruit axis is short, and the fruit finger is short. 3. Because the banana originated in the tropics, its cell wall is thin, the content of pectin calcium and lignin is low, and the vacuole contains a lot of potassium to maintain osmotic pressure. low temperature, overcast and rain make the cells absorb too much water and lack the supply of potassium, and the cell wall becomes thinner over a long time. Or break the loss of water, so that the whole vascular tissue is destroyed. 3. Prevention and control methods of banana frost injury: 1. Cover banana with plastic film and celestial film: select black plastic film or rice straw to cover the mother plant and the border around the bud head to prevent frostbite of banana head and root system. If covered with straw, it should be about 20 cm thick and wet, press the soil, and be windproof. Skyfilm can more effectively reduce the risk of frost on banana industry, improve the overwintering ability of banana plant population, inhibit the growth of weeds and prevent freezing rain from silting at the bottom of ridges. Method 2. Bagging banana ears: bananas that have not been harvested in November, especially those whose skin has not turned green soon after breaking their buds, should be covered with a special cold-proof film bag for bananas (if possible, it is best to use non-woven blue double-layer bags). Spraying fruit protection medicine before bagging can not only play the role of liquid film bagging, but also prevent fruit rust, prevent fruit cracking, improve fruit surface coloring and brightness, reduce residual poison and improve quality. When bagging, put on the old newspaper and papyrus first, which can improve the bagging heat preservation ability and prevent the film from coming into direct contact with the banana fruit to facilitate the normal growth and development of the banana fruit. Method 3, rational drainage and irrigation of bananas: in case of sunny frost, the furrows should be filled with water in time to keep warm and prevent frost. On the contrary, when it comes to wet and cold weather, attention should be paid to eliminating stagnant water in banana orchards and raising ground temperature. Method 4. Clear and smoke the banana garden: remove weeds and debris in the banana garden; pile up the ground with withered banana leaves, wood, wood chaff and rice straw, light it in the evening before the cold spell comes, and let it slowly burn and smoke, so that a layer of smoke is formed over the banana garden to reduce freezing damage. Method 5. Increase the application of ambiguous fertilizer to bananas: apply little or no nitrogen fertilizer in winter to avoid reducing the cold resistance because the leaves are too green, and more ambiguous fertilizers such as biological fertilizer, burning soil or soil manure should be applied to increase soil temperature and improve the cold resistance of plants. Method 6. When new banana leaves are yellowed, missing and bud is weak, biological fertilizer / humic acid / alginic acid + high potassium element water soluble fertilizer can be applied to root irrigation to regulate roots, supplement potassium and strengthen plants. improve the cold resistance of banana itself. Or apply extra-root topdressing organic calcium + potassium dihydrogen phosphate + cold-resistant foliar fertilizer to directly supplement leaves, flowers and fruits to ensure its normal development. Techniques for sprouting and removing buds in banana trees video of banana planting techniques