The adoption of corn post-emergence technology is an important agricultural measure to solve the labor shortage and improve the weeding effect. According to the experience of post-emergence use of corn for many years, it is necessary to do a good job of weed control without affecting the normal growth of corn.
First, master the best period of post-emergence eradication. General corn 3-5 leaf stage, weeds from the second leaf to the four-leaf one-heart spraying. For the better soil moisture content and flat field, the history of no previous application of herbicides or herbicides was shorter. The main weeds in the field were crabgrass, Setaria virescens, alfalfa, amaranthus retroflexus, etc., which can be applied at the corn 3-5 leaf stage. After the stem and leaf treatment agent; For long-term application of closed herbicide corn field block, in the corn 3-5 leaf stage, field aconite, glutinous rice dumplings occur in large quantities, you can use nicosulfuron and other postemergence stem and leaf treatment agent Spray evenly. When the application of pesticides is not uniform or the drug amount is large, the corn leaves have a small amount of yellow spots and can be recovered in a short period of time, and generally do not affect the growth and yield of corn.
Second, to identify the post-maize replacement period. Due to the lack of chemical weeds, poor lyrics, and less weeds in the field in the previous period, weeds can be removed by spraying both weed control and herbicides in the 6-8 leaf stage of maize and 50 cm corn plant height. The weeds that have emerged in the field can be closed and no longer grow grass. For example, nicosulfuron plus nitrazine may be used for directed drug application.
Third, corn post-emergence herbicide use should pay attention to matters. One is to choose a good combination of pesticides. When weeding and pesticides are used together, it is recommended that they be mixed with pyrethroid pesticides to prevent their combination with organic phosphorus pesticides, and secondly, to prevent phytotoxicity. The use of herbicides should be stopped when the temperature exceeds 35°C to prevent high-temperature harms. It is not recommended to carry out the post-emergence eradication of corn to reduce the risk of injury to corn; avoid the important part of corn, the heart of corn horns to herbicides. Sensitive, to prevent the liquid contact with the corn leaves and inflow corn horn; one week before and after the post-emergence herbicide spray, the use of organic phosphorus pesticides is strictly prohibited, otherwise corn seedlings phytotoxicity.
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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