Causes and prevention methods of frost injury of banana trees and fruits damaged by low temperature

Banana is a tropical fruit, bananas planted in subtropical and temperate zones are often affected by freezing damage, affecting banana yield and quality, causing economic losses, the following green food network Xiaobian for you to introduce banana freezing damage causes and prevention methods, I hope to help.

banana freeze injury

Causes of banana freezing:

1. Because the transportation of banana nutrients from roots to leaves needs to be completed through transpiration, under low temperature environment, leaf transpiration is weak, so nutrients cannot reach leaves, that is, new leaves are yellow and missing.

2. Banana buds need a lot of energy and high temperature. Low temperature makes the minerals and carbohydrates needed for bud development and fruit axis elongation not available, so the buds are small, the fruit axis is short, and the fruit fingers are short.

3, banana originated in the tropics, thin cell wall, pectin calcium, lignin content is less, vacuoles rich in potassium to maintain osmotic pressure, low temperature and rain make the cells absorb too much water and potassium supply is insufficient, a long time, cell wall thinning, or damage water loss, thus destroying the entire vascular tissue.

Banana freezing prevention method:

First, cover plastic film, day film: cover banana mother plant and suction bud head with black plastic film or straw, prevent banana head and root frostbite. If covered with straw, the thickness should be about 20cm and wet, pressed soil, windproof blowing. The canopy can reduce frost risk more effectively, improve banana overwintering ability, inhibit weed breeding, and prevent freezing rain from depositing at the bottom of ridge.

banana bagging

2. Fruit bagging: bananas failed to be harvested in November, especially those whose skin has not turned green soon after the bud is broken, so it is necessary to put on banana special cold-proof bags in time (conditional, double bagging with non-woven fabric blue). Before bagging, spray fruit protection medicine first, can play the role of liquid film bagging, but also can prevent fruit rust, crack fruit, improve banana coloring and brightness, reduce residual poison, improve quality. When bagging, first pad old newspaper, straw paper, can improve the heat preservation ability, prevent the film directly contact banana fruit, banana fruit normal growth.

III. Reasonable irrigation and drainage: in case of sunny frosty days, fill the furrow with water in time to keep warm and prevent frost. In case of wet and cold weather, the accumulated water in banana garden shall be removed and the ground temperature shall be increased.

IV. Garden cleaning and smoking: weed in banana garden shall be eradicated, sundries in banana garden shall be cleaned up; dry banana leaves, firewood, chaff, straw, etc. shall be piled up and lit in the evening before the arrival of cold current, so as to slowly burn and smoke, form smoke over banana garden and reduce freezing damage.

5. Increase the application of warm fertilizer: try to apply less or no nitrogen fertilizer in winter to avoid reducing cold resistance due to too green leaves. Apply more biological fertilizer, burned soil, soil fertilizer and decomposed pig dung and other warm fertilizers to increase soil temperature and improve banana cold resistance.

VI. In case of new leaf yellowing, lack of cutting, bud pulling weakness: root irrigation for cold protection, application of biological fertilizer/humic acid/alginate + high-potassium element water-soluble fertilizer, conditioning roots, supplementing potassium, strengthening plants, improving banana cold resistance. Or apply organic calcium + potassium dihydrogen phosphate + cold-resistant foliar fertilizer to banana roots, directly supplement leaves and flowers, and promote their normal development.