Effect of pruning management of switchgrass on its tree beauty and its garden

October 20, 2018

Content: Weeping Willow is one of the most important tree species in China and it is loved by people. In particular, the successful breeding of the blue-leaved weeping willow bird has further consolidated its position in high-standard greening. It is known for its obvious trunk, straightness, beautiful tree shape, soft branches, large sag, and no flocculation. It is not only very useful in afforestation, but also has a significant role in greening. It has been widely recognized by afforestation workers and widely used in urban and rural garden greening. Weeping willow seedlings have always sold well, and there is a trend of supply shortage, the existing seedling production capacity and level has not been able to meet the needs of social production, people's lives and greening of urban and rural areas. In order to alleviate this contradiction between supply and demand, forestry workers have adopted a series of measures such as increasing the amount of fertilizers, strengthening irrigation, cultivating and weeding, and using rooting agents. Although some effects have been achieved and some problems are solved, the effect is not obvious. The rate is low and the gardening rate is only 50%. Many nursery stocks have occupied nursery land for more than five years, and they eventually became waste seedlings. When they used to burn wood, it was a pity. In view of this situation and the existing problems, we have continued to explore and research in the production of nursery crops. We want to find a best way to meet the needs of production and to improve the quality of nursery and the yield of seedlings. In the production, we found that the method and time of pruning had a great influence on the dry type, seedling quality, and yield of seedlings. In 1996 we began exploration and experimental investigation of pruning time and methods. The following methods were adopted under the same conditions as cultivating and applying fertility: first, planting seedling roots; second, cutting roots; and third, selecting 9 methods for planting seedlings according to different times and different times of pruning. . The specific method steps and test results are as follows: (1) planting seedling roots, timely wiping and pruning management, leaving an upright, strong branches to be cultured seedlings, and the remaining branches and buds are all erased to ensure nutrient supply to the seedlings; Double-cut bud management to ensure good seedling growth, trunk straight and obvious; in the third year of winter and spring strength pruning, trim from bottom to top, knife and scissors should be close to the trunk, the knife edge should be smooth, do not stay茬 茬 不 不 不 不 不 不 不 不 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬 茬. This method works very well. Seedlings grow fast and grow well in the year. They draw more than 2 meters in the year, 0.5-0.7 meters more than seedlings, and have high seedling yield. Seedlings and nursery time is short, 3-4 years seedling diameter up to 4 cm or more, to green standards, can be out of the garden. (2) The seedlings are flat, the specific method is the same as (1), and the effect is also very good, but it is more laborious. (3) The seedlings are not pruned, only weeding and cultivating, fertilizing management, let them grow. The effect of this method is extremely poor. It takes a long time to go out of the plant and takes more than 6 years. The finished product has a low rate of production and return, only 40%. (4) Planting seedlings, pruning in the first year, cutting the dry shoots in time, leaving upright branches for head replacement, and timely spraying the shoots in the later period. The second year of spring, summer, and the third year of spring and summer, respectively, the second pruning, pruning should be carried out in accordance with the required standards to ensure its quality, and the rest of the normal management, 4 years breast diameter of 3 cm, the finished product out of the garden rate of 75%, more work. (5) Planting seedlings, with the same year (4) in the first year, no trimming in the second and third years, 4 cm diameter at breast height 3 cm, and 60% yield. (6) Planting seedlings, with the same year (4) in the first year, pruning in the second year, pruning in the third year, breast diameter of 3.5 centimeters in 4 years, yield rate of 84%. (7) planting seedlings, the first year with the (4), pruning the second year, the third year is not pruned. 4 years breast diameter 3.5 cm, finished product rate 80%. (8) planting seedlings, the first year with the (4), the second year of winter and spring pruning, the third year without pruning, 4 years diameter of 3.5 centimeters or more, the finished product out of the garden rate of more than 83%. (9) Planting seedlings, pruning in the winter and spring of the second year, timely spraying the buds in the later period, and only wiping the buds in the third year, and the breast diameter of 3.5 cm or more for 4 years, and the finished gardening rate of finished seedlings reaching 85% or more. Through several years of experimental observation, we believe that the method, time, and frequency of pruning have a great influence on the quality, yield, and seedling rate of weeping willow seedlings. No pruning tree type is poor, and the yield is very low; the small number of pruning has little effect on the seedlings of seedlings; the pruning is too frequent, the branches and leaves are lush, the branches are plentiful, the crown is large, the trees are bent, the tendons are pulled, and the seedlings are also affected As a result, the tree is not beautiful, and the rate of gardening is low.