First, the pear tree is tall, dry, strong, slow growth, long life Pear saplings under the same management conditions, pear trees and apple trees of the same age, the pears have a small diameter, dry fine, crown was conical However, after the results, especially after the full fruit period, the tree was opened more than the apple tree. Therefore, when pear saplings are pruned, they should be lighter than apple trees; timely and appropriate control of the center's growth potential and growth rate should be used to promote the growth of other branches.
Second, the pear has a high germination rate and a low branching force. Most of the pears have a high germination rate and a weak branching force. Therefore, there is less room for selection when shaping, and it is more difficult to cultivate a standard tree shape. In order to reduce the amount of pruning, so that the pear tree early results, do not force the tree when shaping, especially the lateral branches, there are left, no, etc., until the natural angle to open, after the sprouting branch after the rear side branch.
Third, the pear has a strong apical apical phenotype and many uniaxial extensions. It is more difficult to cultivate large- and medium-sized branch groups with large branches and open angles. In the process of culturing the branches and branches, strong branches should not be long-distributed. Each year, we will cut weak discharges; when we reach the number of branches, we will put long-term results and quantitative results, leaving room for them.
Fourth, the number of main lateral branches to stay longer than the apple, the extended branches of these backbone branches can not be put slowly and too short and short cut, so as not to increase the relative length of the posterior segment with the extension of the stem branches, early in the back of the The short branches tend to age, become long-term ineffective branches, and finally drown to death, resulting in the premature decline of internal hemorrhoids, and the phenomenon of missing branches. After this situation is created, non-repetition cannot be overcome.
Fifth, the growth of pear buds at the base of a long-lasting bud is the main source of dormant buds. Therefore, the regeneration of shoots from apple trees is better than that of apple trees. Therefore, after entering the full fruit period, in the event that the backbone branches grow weak and the result area is seriously moved out or old trees are renewed, this feature can be used to rejuvenate the rejuvenation to prolong the result of years.
Swabs are ideal for collecting large numbers of samples and quickly eluting samples. It immediately releases specimens into transport media and is widely used in molecular genetics, forensic science, clinical laboratories, and more.
Medical disposable sample collection sample flocking swab,A tube flocking swab for the collection of nasal cell samples,Single use
Jiangsu iiLO Biotechnology Co., Ltd. , https://www.iilogene.com