柳树是榆林地区营造用材林、防护林和四旁绿化的优良乡土树种。柳椽生产投资少,见效快,受自然灾害制约少。因此,有必要对商品柳椽生产技术作以介绍。1.宜林地和种杆选择:高杆柳宜栽植在村旁、水旁、渠旁、路旁、沟谷地和下湿滩地。当地柳树类型有白皮柳、青皮柳、羊角柳和红心柳等。其中白皮柳是高杆柳的优良类型。其具有干形通直、节疤少、生长快和病虫害少等特点,因此,应选择白皮柳作为种干。根据多年生产经验,要选用3—4年生、长3米、小头直径3—4厘米、无病虫害的种杆。由于树龄越大,插植成活率越低,故5年生以上柳杆不宜用作种杆。砍种杆的 Willow trees in Yulin area to create timber forests, shelterbelt and greening around the fine native tree species. Liu rafters less investment, quick, limited by natural disasters. Therefore, it is necessary to introduce the product Liu rafters production technology. 1 should be the choice of forest and seed bar: High pole Liu should be planted in the village next to the water, next to the canal, roadsides, valleys and wetlands below. The local types of white willow birch, green blue willow, claw Liu and heart and so on. Which white birch is a good type of high pole. It has the stem-shaped straight, less knots, fast growth and fewer pests and diseases and other characteristics, therefore, should choose white birch as a kind of dry. According to many years of production experience, to choose 3-4 years old, 3 meters long, small head diameter of 3-4 cm, no pests and diseases of the rod. As the tree age, the lower the survival rate of planting, it will not be used for more than 5 years willow bar for seed bar. Cut the rod