Calcium is one of the important essential nutrients for crop growth and development. After investigation, it has been found that many orchards have neglected the application of calcium and other trace elements in the production of fruit trees for many years because they only pay attention to the input of chemical fertilizers (nitrogen, phosphorus, and potassium). In addition, due to the poor ability of the roots of fruit trees to absorb calcium, due to different raw materials, the leaves penetrate poorly after spraying, and the absorption is slow, resulting in poor mobility of calcium in the tree and other characteristics, making the calcium deficiency of fruit trees more and more prominent.
Calcium deficiency in crops can cause a variety of physiological diseases and physiological obstacles, affect the growth and development of crops, flowering and fruit setting, resulting in poor fruit quality.
Three golden periods of calcium supplementation: Fruit trees absorb calcium three times a year, the first time is about 20 to 30 days after flowering, and about 30% of calcium can accumulate in this period. It is recommended that calcium and boron be supplemented at the same time; second The second is in the fruit enlargement period, which can absorb about 50% of the total calcium; the third time is about 20 to 30 days before fruit picking. The calcium absorbed in this period can be used for calcium needs for fruit tree growth next spring.
In the orchard, organic fertilizers are added to fertilize the soil to promote the absorption and utilization of calcium by fruit trees. At the same time, it advocates targeted extra-root calcium supplementation during the three peak calcium absorption periods to improve calcium concentration and application quality.
There are two characteristics to choose a good calcium fertilizer: one is that the concentration of calcium ions is high, which requires more than 10%; the other is that the activity of calcium is high, and the absorption rate is high, which requires more than 80%. Generally, calcium chloride and calcium nitrate have the characteristics of high calcium content, but low absorption efficiency; calcium amino acid has the characteristics of high absorption efficiency, but the calcium ion content is low, about 5%.
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Spinal fixation system consists of posterior spinal fixation system,minimally invasive spinal system,posterior cervical fixation system,anterior cervical plate system,laminar shapping plate system and interbody fusion cage system.
Cervical and lumbar segmental implants are the most common types of spinal internal fixation, which can be roughly divided into anterior and posterior internal fixation according to their fixed positions and surgical approaches.
The anterior cervical vertebra is mostly fixed with locking plates and fixed screws,what are mostly made of titanium alloy materials; The posterior approach was fixed using the pedicle screw and rod system.
In some cases of spinal vertebrae bone defect, it is also necessary to implant titanium cage or PEEK cages to promote bone fusion of adjacent vertebrae. The titanium mesh cage refers to a cage shaped container made of titanium alloy material, which is loaded with autologous or allogeneic bone and placed in the spinal vertebrae bone defect, which not only serves as a strength support but also plays a role in bone fusion.
spinal fracture,Pedicle Screws,Spinal Implant,Spine Implants
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