Delayed sprouting to avoid frost

The trunk is white or white in early spring. In the early spring, the trunk and backbone branches are whitened. The formula of whitening agent is: 10 parts of quicklime, 1~2 parts of salt, 35~40 parts of water, and 1~2 parts of raw bean juice to increase the adhesion. It is also possible to spray the crown with 10~20 times of lime water to reflect the light, reduce the absorption of heat by the tree, and reduce the temperature of the canopy and shoot buds. This can delay flowering for 3 to 5 days.

Watering or spraying water in spring. After the fruit tree is germinated and watered or sprayed for 1 or 2 times before flowering, slowing down the temperature rise can significantly reduce the orchard ground temperature, and the flowering period can be postponed for 2~3 days.

Improve orchard microclimate

Heating method: heating anti-frost is a more advanced and effective method for modern anti-frost. Place a heater at a certain distance in the orchard, warm the igniting before the frost will occur, so that the lower air will warm up and rise, while the air with the higher temperature in the upper layer will fall, forming a heating layer around the fruit trees, which can generally be improved. Temperature 1 ° C ~ 2 ° C.

Smoked smoke method: According to the weather forecast and the measured temperature of the orchard, before the frost comes (when the temperature in the park is close to 0 °C), the sawdust, wheat stubble, broken straw or orchard weeds are alternately stacked for fuel, and piled up and pressed. Use a fumigant (2 parts of ammonium nitrate, 7 parts of sawdust, 1 part of diesel, mix well, pack with paper tube, plus moisture-proof film) to ignite the smoke. The smoke stack is placed at the upper vent of the orchard, generally 4 to 6 piles per acre orchard (the size and number of the smoke pile depends on the frost intensity and duration). The time of smoking is generally from 0:00 pm to 3:00 am the next day. It is better to use dark smoke to make the smoke fill the whole orchard. When it is dawn, it can stop the smoke.

Tree tray covering grass: Covering the tree tray with weeds in early spring, the thickness is 20~30 cm, which can make the tree tray warm slowly, limit the early activities of the root system, and delay flowering. If combined with irrigation, the effect is better.

Other measures: Install a high-power air blower over the orchard to stir the air, which can blow away the agglomerated cold air and have the effect of preventing frost. Spray nutrient solution or chemical anti-frost spray fruit tree antifreeze: 1~2 days before the frost comes, spray the fruit tree antifreeze plus PBO liquid 500~1000 times liquid, the antifreeze effect is better. You can also spray homemade antifreeze (8 parts agar, 3 parts of glycerin, 43 parts of glucose, 44 parts of sucrose, 2 parts of nutrients such as NPK. Soak the agar with a small amount of water for 2 hours, then heat to dissolve, then the rest. Add it and mix it evenly before use. The spray concentration is 5000~8000 times.

Spray nutrient solution: Before the strong cold air comes, the orchard sprays the brassinolide 481 and Tianda 2116, which can effectively alleviate the sudden drop of the orchard temperature or regulate the cell membrane permeability, and can better prevent the frost.

Post-disaster response

After the frost, the tree growth and results of the orchard in the producing area should be quickly checked and a specific response plan should be proposed for the actual disaster situation.

Comprehensively assess the impact of frost on young fruit, new shoots, young leaves, flower organs, etc. of fruit trees, and implement positive response measures to minimize disaster losses as much as possible.