In the beginning of spring, it is a good time for crops to replenish fertilizer. However, if the following 13 "taboos" are violated when fertilizing, it will not only avoid waste of fertilizer, but also cause crop damage.
1. Ammonium bicarbonate and urea cannot be mixed
When fertilizing fruit trees in spring, urea and ammonium bicarbonate are generally applied. The amide nitrogen in urea cannot be absorbed by crops, and can only be absorbed and utilized by crops after being converted into ammonium bicarbonate under the action of soil enzymes. After the soil, it will cause the soil solution to be acidic in a short period of time, which can accelerate the volatilization loss of nitrogen in urea, so the two cannot be mixed.
2. Ammonium bicarbonate cannot be mixed with bacterial fertilizer
When topdressing bacterial fertilizer in the soil, do not apply bacterial fertilizer and ammonium bicarbonate together, because ammonium bicarbonate will emit a certain concentration of ammonia gas, which has a certain toxic effect on the active bacteria in the bacterial fertilizer, and will make the bacterial fertilizer lose its fertilizer effect.
3. Acid fertilizer can't be combined
Mixed use of alkaline fertilizers
Spring crops are generally deficient in nitrogen. When topdressing nitrogen fertilizers, acidic fertilizers and alkaline fertilizers cannot be mixed. Once mixed, neutralization will occur, which will cause nitrogen loss and reduce fertilizer efficiency.
4. Can not water immediately after urea application
After applying urea to the crop, it is impossible to water it immediately because the urine
After being applied to the soil, the nutrients will be converted into amides. If you water them immediately, they will easily run off with the water. In addition, after applying urea, the method of covering soil can improve fertilizer efficiency.
5. Avoid using ammonium nitrate
Pay more attention when applying ammonium nitrate. If you don't use it, you don't need to, because fruit trees absorb ammonium nitrate ions very easily. If you absorb too much, it will cause fruit tree poisoning.
6. Ammonium sulfate cannot be used for a long time
Ammonium sulfate on the market is a physiologically acidic fertilizer. If it is applied on the same soil for a long time, it will increase the acidity of the soil and destroy the soil aggregate structure; if it is applied in alkaline soil, the ammonium ions of ammonium sulfate will be absorbed, and The acid root ions remaining in the soil react with calcium, which will make the soil harden and harden, which also has a great influence on the root activity.
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Orthopedic external fixation system
The screw orthopedic is inserted into the bone near the fracture, and the fracture is fixed with an external fixator assembled by a chuck and a nail rod.
Indications
open fracture, nonunion, closed fracture with extensive soft tissue injury, fracture with multiple trauma, osteotomy and correction.
The use of orthopaedic external fixators is currently a superior fracture fixation technique, filling the gap between cast and internal fixation. At the same time, orthopedic external fixator has the characteristics of simple fixation method, stable, reliable and effective, and does not limit the joint movement, can be early ambulation advantages. It can reduce the time for the operator and is more friendly to the user. The external fixator was used together with the bone traction needle. In terms of the classification of orthopedic external fixators, it is mainly divided into four types: orthofix type external fixation, ilizarov type external fixation, ao synthes type external fixation,combined external fixator and common external fixators.
The external fixators in orthopaedics was used for reduction (shortening and overlapping displacement were corrected first, then lateral and angular displacement were corrected, and finally rotational and separation displacement were corrected; If closed reduction is difficult, open reduction can be considered, but the separation of soft tissue and peeling of periosteum should be minimized.
The selection of the insertion site.According to the anatomical characteristics of the soft tissue at the insertion plane, the important nerves, vessels and tendons should be avoided; The ideal entry point is the part of the bone close to the subcutaneous, in a word, generally choose the skin and bone between the muscle soft tissue is the weakest point into the needle. The installation shall facilitate observation and control of soft tissue damage, and permit any surgery that may be required, such as repair and reconstruction, dressing change, skin grafting, or bone grafting." According to the location of the bone, different diameters of the threaded needle were selected. Removal was performed after completion of late treatment.
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