Too high temperature or high humidity in summer will affect the normal pollination and fertilization of tomatoes, resulting in poor flowering and fruit setting. If the plants are prosperous and nutrients are scarcely supplied to flowers and fruits, the phenomenon of poor flowering will also occur. So how to preserve flowers and fruits in summer?
Supplement boron before flowering and calcium supplement after flowering, that is, apply boron fertilizer once before each flower formation or opening, promote good differentiation of flower buds and avoid the formation of deformed flowers. If boron fertilizer is sprayed, spray 500-1000 times with water, once every 10 days. When the flowers are held or the fruit is seated, calcium fertilizer should be sprayed once at a time. It is best to choose chelated calcium or calcium lignin and spray 1000-2000 times with water. You can also apply boron calcium fertilizer in advance.
When the first flower in each ear is opened reasonably, 3 to 4 flowers will grow together in the back, and 2 to 3 days after the first flower in each ear, 4 to 5 flowers will appear in the back. It is also important at this time. You should master the flowers before they bloom. It should be noted that the concentration of anthers should decrease with increasing temperature to avoid the formation of deformed fruits due to the excessively high concentration of anthers.
Control the temperature of the flowering period. The temperature in the daytime is about 28 ℃, not more than 34 ℃, and the night temperature is not more than 20 ℃. When the temperature is too high, it is recommended to use a shading net or a cooling agent to cool down. Before and after noon, it can be used with micro-spraying equipment to cool the water, and at the same time ease the humidity in the shed.
Spraying flower-promoting fertilizers such as seaweed or amino acid foliar fertilizer can improve the quality of flowers, ensure fruit development, and enhance fruit resistance. For example, alginic acid foliar fertilizer, spray 500 to 1000 times with water, continuous spraying 2 ~3 times to promote flowering and fruit setting.
Reasonably retain the fruit. When the young fruit sits, select the fruit of the same size, similar fruit shape and no pests, and then remove the rest of the fruit. For example, large fruit type tomato leaves about 3 per ear, medium and small fruit type can leave 4 to 5, and deformed fruit should be removed in time.
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Cannulated screw is a common internal fixation device in orthopedic surgery.
Working process
During the operation, the Kirschner wire with the hole matching the hollow screw is first drilled into the bone of the fracture site, and then the hollow screw is screwed into the fracture site through the guidance of the Kirschner wire. Finally, the Kirschner wire is pulled out to complete the fixation of the fracture site. In many cases of fracture of the neck and femur, the healing cycle is long, and it usually takes about 30 months to remove the cannulated screws. At this point, the bone and the surface of the cannulated nail are closely connected and firmly connected in the nail path, which leads to defects easily generated by conventional nail removal methods, causing secondary injury at the fracture healing site and causing pain to the patient. Percutaneous cannulated screw internal fixation for femoral neck fractures has the advantages of small trauma, good healing, low rate of femoral head necrosis, and good stability.
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