Infectious diseases such as apple rot disease. According to the survey, more than 90% of the diseases of fruit tree branches are infected from wounds.
Weakened tree vigor wounds are not well protected and healed poorly, and the wounds lose a lot of water after they dry up. Especially in winter and spring, tree body activity is relatively weak. Unhealed wounds will lose water for a long time and fast under cold and dry conditions, and hinder the transportation of water and nutrients after the beginning of spring, which can cause tree weakness and disease resistance. Weaken.
After shortening the life of the wound and becoming sick, scraping bones to heal the wound hinders the up and down transportation of water and nutrients in the tree, and the tree naturally weakens. Usually people see that the main branch corresponding to the big scars grows weaker, and the skin of the fruit is rough and the surface is poor. This is the reason. The diseased tree itself has little storage of nutrients. If the load is too heavy, dead buds, dead branches, and dead trees will appear after a large number of fruits, which shortens the economic life of fruit trees.
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Central Venous Catheter(CVC)
Objective To study the application of spiral fixation for central venous catheter in clinical nursing.
Cvc Catheter,Medical Cvc Catheter,Single Lumen Central Venous Catheter,Triple Lumen Central Venous Catheter
Zhejiang Haisheng Medical Device Co., Ltd , https://www.hisernmedical.com