The best time for winter irrigation is the time of winter irrigation for fruit trees. The winter irrigation is the proper period after fruit harvest and before the soil is frozen. The winter irrigation is too early, the temperature is relatively high, and the evaporation is large, which is not conducive to water storage and water retention, and reduces the cold and frost resistance of fruit trees. If it is too late, the temperature will be low, the soil will compact, the water will not penetrate, the accumulated water will freeze, and the roots of the fruit trees will be vulnerable to frost damage. Fruit trees are usually irrigated in winter with an average ground temperature of 5 ℃ and a temperature of 3 ℃. At this time, even if the nighttime temperature drops below 0 ° C, freezing occurs, but the daytime temperature can still be thawed. So it is the best time for winter irrigation of fruit trees. The amount of irrigation water for winter irrigation of fruit trees seeps into the ground on the day after irrigation and penetrates into the root distribution layer, that is, 20-30 cm for young fruit trees and 70-100 cm for adult fruit trees. The soil humidity is maintained at 60% of the maximum water holding capacity in the field. 80% is appropriate. Winter irrigation method 1. Well irrigation: Fruit farmers with wells in good conditions adopt the well irrigation method. Before well irrigation, in the fruit tree field, according to the fruit trees, dig and repair the canals, open the gate to release water, fill the irrigation, and make the fruit trees full. Drink enough to increase root moisture and improve growth. 2. Watering the roots: water the roots of the 1 to 2 year old fruit trees, and use an earthen pot with an earthen pot around the perennial fruit trees, which is 15 to 20 cm high, to prevent water from flowing out and save water. Water concentration promotes strong water penetration. 3. Drip irrigation: For orchards with drip irrigation conditions, drip irrigation or sprinkler irrigation can save 60% to 70% of water. 4. Ditch: For perennial fruit trees, 50-70 cm away from the fruit tree, dig a small trench around the fruit tree, pour water into the trench, and the water will sink to the root and be absorbed by the root. If it is impervious for the first time, after pouring it again the next day, fill up the trench with soil and be sure to prevent wind damage to the roots. When ditching and adding soil, be careful not to hurt the roots. Otherwise it will affect the growth of fruit trees. 5, turn over the ground to protect the soil: winter irrigation will cause the soil surface to compact, the soil capillary is intact, causing the soil water evaporation to accelerate, affecting the effect of winter irrigation. Therefore, according to the different types of orchard soil after winter irrigation, timely and moderate artificial ground turning can damage the soil capillary system, reduce soil water evaporation, and increase soil fertility through the whole winter sun exposure, and reduce the pest and disease survival rate through cold winter temperatures. Disclaimer: Some articles on this website are transferred from the Internet. If you have third party legal rights, please inform this website to deal with them. phone PCR Reagent For Bacterial Resistance PCR,PCR Reagent,Molecular diagnosis,Bacterial resistance Shenzhen Uni-medica Technology Co.,Ltd , https://www.unimedicadevice.com