Liuba is one of the counties in the Qinling Mountains where walnuts grow. There is a custom of "cutting walnut trees with a knife" among the people. In fact, this is a scientific way to manage walnut trees. Every year at the end of winter and the beginning of spring, the walnut villages in the mountains begin to "cut walnut trees with a knife", until the upper part of the roots of the walnut trees are cut into fish scales. After the Spring Festival, the weather gradually warms up, and the hibernating walnut trees begin to water. "Chopping walnut trees with a knife" on Laba can kill the eggs of pests hidden in the bark of walnuts, and then the bitter water in the walnut trees will flow out. The flow of dry water can increase walnut yields and reduce fruit thinning and flower drop. Modern scientific management has also found that this "cutting walnut trees with a knife" management method can not only eliminate pests, but also adjust and maintain the nutrients and fruit setting rate of walnuts. "Chopping walnut trees with a knife" not only needs to grasp the good opportunity around the first and middle ten days of the twelfth lunar month, but also needs to be cut just right, so as to eliminate pests and control water without hurting the trees. In the walnut producing area of Liuba, around the 8th day of the twelfth lunar month, many people go to chop down walnut trees, young and old, everywhere. You can hear the sound of "chopping down walnut trees with knives". "Don't cut too many holes!" They all shout, but they are all very excited to "chop". (No pictures yet, welcome to provide.) (No pictures yet, welcome to provide.)