1. Continuous cropping Gao Qian method is often used for greening in cities, industrial and mining enterprises and institutions, when paulownia seedlings are damaged after planting or their growth is not good. In the case of high management level, continuous stubble leveling twice (that is, two years) is the best, which can meet the requirements of Gao Qian of Paulownia, and the root system grows well, and the incision heals quickly and completely. The specific method is to cut off the trunk evenly after planting the seedlings, and the cut mouth should be flat (if it is too thick, use a saw), and bury the cut mouth with fine soil. In spring, 1 ~ 2 branches can grow at the base. When its length reaches 10 ~ 15 cm, keep one with good direction and vigorous growth as the main planting, and cut off the rest. As long as the fertilizer and water are properly managed, it can grow 4 ~ 5 meters a year. The next winter, the roots of paulownia were very strong, and the stubble was cleaned for the second time like the previous year. The height of the tree is 1 year, that is, it grows to 5 ~ 6 meters, and the trunk is full and straight. Later, the lateral branches on the upper part of the trunk formed a crown, which promoted the diameter growth of the trunk.
2. This method can be used in places with big and strong seedlings and good site conditions. After the newly planted seedlings germinate in spring, when the lateral buds germinate and grow for 2 ~ 3 cm, choose a robust lateral bud at the top of the trunk as an extension branch of the trunk to continue to grow upwards, and at the same time peel off another weak bud and cut off the fine buds and branches at the upper part. In order to ensure the straight growth of the central main branch and prevent the emergence of competitive branches, it is necessary to properly damage several pairs of buds under the terminal buds or cut these competitive branches in summer to weaken their growth. The new branches sprouting from the middle and lower parts of the trunk are generally controlled by the top advantage, which will not grow excessively and pose no threat to the trunk. They should be kept without cutting to increase the nutritional area. Under the condition of good fertilizer and water management, new buds can generally grow about 2 meters. In the second year, it is still treated according to the method of the previous year, but the buds of the extension branches of the trunk should be opposite to the direction of the first year, so that the trunk can gradually grow synthetically. According to the requirements of the ratio of crown to height, gradually drain the main branches at the lower part of the trunk. As long as we pay attention to balancing the tree potential in the years to come; Gradually increase the height under the branches.