Poplar shaping and pruning
Nowadays, poplars are increasingly being used in the sheet metal processing industry. This requires us to not only achieve "rapid growth and high yields" in poplar cultivation, but also to "high quality", that is, to cultivate straightforward and unstructured materials. To achieve this goal, we must pay attention to plastic surgery and pruning. 1 The plastic shaping is to make the trunk straight, and the trunk is curved because the bent part has past or present a competitive branch and pushes the main trunk to one side. Plastic surgery is to start from the end of the first year or the second year after planting, and to trim the side branches competing with the main trunk until 3-5 years later, the trunk height reaches 10-14m, and the trunk below 8m is straight and complete. Some varieties have inferior lignification and weak end buds. On the top of 2-3 years old young trees, they can see 1-2 or even 3 side branches competing with the main shoots. The injury to the top buds can also cause this result. In order to avoid this phenomenon, before the afforestation, the unfilled tip can be cut off and cut to about 2 cm above the top side bud. Reasonable truncation will not reduce high growth, but is conducive to plastic surgery. 2 Pruning pruning is to cultivate pristine and other unprocessed materials used in the processing industry. When the diameter of the trunk at the side of the branch below 8 m reaches 10 cm in diameter, the lateral branch should be repaired, ie, the pruning with a fixed diameter, and pruning up to 8 m according to the diameter of the trunk. This will ensure that the core of the dry wood core is no longer than 10 cm. The pruning height is roughly as follows: a small amount of 1-3 years of pruning, 4-5 years of pruning to 1/3 of the tree height, 6 years after pruning to 1/3-1/2 of the height of the tree. 3 After pruning the pruning, the lower trunk can be grown again, and sometimes the pruning stimulus grows in the original place. These moths should be cut off as soon as possible. Pruning should be done when there is no growth in the fall or early spring. Pruning should be close to the trunk and leave no spades so as to avoid forming knots. Use tools should be sharp, the wound should be smooth, not to tear the bark. The emphasis on trunks below 8 m is that they are dry and straight, and there are no knots other than 10 cm in the core. This is a special requirement for the plywood industry when peeling veneers.