Every winter, farmers store chemical fertilizers left over or purchased for spring planting next year. Some people do not understand the nature of chemical fertilizers, ignore scientific management, and stack them arbitrarily, which not only reduces fertilizer efficiency, but is also prone to danger. ****** Chemical fertilizers have different characteristics, some are acidic or alkaline, some are corrosive or toxic, some are very easy to absorb moisture and agglomerate, some are easy to volatile and lose, and some are flammable and easy to lose. burst. Especially when the humidity in the warehouse increases after entering spring, proper storage methods must be adopted according to the different characteristics of the fertilizers to avoid deterioration or reduce fertilizer efficiency.
Different types of fertilizers must be stored separately in the warehouse, labelled, and indicate the name and chemical composition. They must not be mixed. Ammonium nitrogen fertilizers such as ammonium sulfate, ammonium hydrogen nitrate, ammonium chloride and ammonia water, when encountered with alkaline fertilizers such as plant ash, lime and lime nitrogen, are likely to cause nitrogen volatilization and reduce fertilizer efficiency; nitrate nitrogen fertilizers such as ammonium nitrate and sodium nitrate are compatible with The mixing of superphosphate will deliquify the fertilizer, causing the nitrate nitrogen to gradually decompose, turning into gas and running away, causing undue losses.
Fertilizers should be stored in a dry place in the warehouse, which is waterproof and moisture-proof. Chemical fertilizers are generally easy to dissolve in water, and are easily agglomerated or turned into liquid to be lost after being damp or wet, which seriously affects fertilizer efficiency. Fertilizers such as ammonium nitrate and ammonium bicarbonate are highly hygroscopic and easily deliquescent; fertilizers such as ammonium sulfate, ammonium chloride, and urea will form hard lumps after absorbing moisture, which reduces fertilizer efficiency and brings trouble to application. When storing, you must be careful not to damage the packaging bag, do not pile it up outdoors, and leave it to wind, snow, and sun. You should also use wooden planks to pad them indoors, 0.3 meters above the ground, and don't pile the same fertilizer too high.
Chemical fertilizers should be stored in a low temperature and dark place. Nitrogen fertilizers are resistant to heat. When exposed to heat, nitrogen will turn into ammonia and run away, reducing its effectiveness. In particular, ammonium nitrate is flammable and explosive. Never mix it with flammable materials such as gasoline, benzene or sulfur in a warehouse to avoid accidents.
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Pediatric series consists of elastic nail,correction plate,pediatric proximal femoral locking plate,LC-DCP locking plate,reconstruction locking plste,T locking plate.
The special manifestations of pediatric fracture
(1) In children, soft tissue is loose, fascia is elastic, swelling after fracture is early, wide range, and often plaque.
(2) Pay attention to subperiosteal fracture, longitudinal percussion pain and local tenderness to consider the possibility of fracture.
(3) Children can be fever, generally below 38 degrees, caused by hematoma absorption.
(4) Identify the ossification center and epiphyseal plate, and add normal side control if necessary.
Characteristics of pediatric fracture repair
(1) The fracture heals quickly, and the younger the age, the faster the healing.
(2) The healing time of fracture is related to fracture site, fracture type, treatment method and individual situation.
(3) Joint stiffness occurred less.
(4) Have a certain shaping ability, the younger the age, the stronger the shaping ability, but the rotation deformity, the angular deformity inconsistent with the joint activity is more difficult to shape itself.
(5) Metaphyseal and shaft fractures due to hyperemia stimulate epiphyseal plate overgrowth, can cause temporary acceleration of limb growth, femur bone.It can overgrow by 0.8-2cm.
Principles of fracture treatment
The first is reduction, fixation, functional exercise. The principle is no longer to damage the epiphysis and epiphysis plate causing growth and development disorders. Manual reduction, plaster fixation, traction. Closed reduction and internal fixation. Open reduction, internal fixation (elastic needles, Kirschner needles, absorbable nails, absorption rods, various steel plates, external fixation brackets, hollow screws, etc.).
bone fracture,fracture surgery,internal fixation,internal fixation of fracture
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