Fertilizers have a "reciprocal relationship" and a "contrast" contradiction. If more phosphate fertilizer is applied, the excess available phosphorus is combined with the available zinc in the soil to form a poorly soluble zinc phosphate precipitate, which causes a lack of available zinc in the soil. Not only that, the excess available phosphorus can also inhibit nitrogen uptake by the crop, causing a nitrogen deficiency. Another example is applying more potassium fertilizer. The excess potassium will reduce the absorption of nitrogen, magnesium, calcium, boron and zinc by the crop, causing the crops to lack these nutrients. In addition, do not apply too much organic fertilizer.

To prevent the “phase gram” between fertilizers, the following methods can be adopted:

1. Try to achieve balanced fertilization. The partial or multiple application of elemental fertilizers to crops not only causes waste and increases production costs, but also easily leads to the lack of some or some other nutrients. When fertilizing, it is necessary to make a living within the limits according to the different structure of crops and the ability of soil supply.

2. According to the crop's demand for various nutrient elements, it is necessary to increase and increase, and decrease and decrease. Compared with elementary fertilizers, the proportion of the nutrient elements of compound or compound fertilizers is more appropriate and harmonious. Therefore, fertilizer application should be based on compound fertilizers and supplemented with elemental fertilizers. For example, for crops that require large amounts of potassium, such as vegetables with tubers and roots, they can be appropriately increased on the basis of sulfur-based compound fertilizer Potassium sulfate elemental fertilizer as a supplement.

3. Stagger application period or application site. If zinc fertilizer and phosphate fertilizer are mixed, it will inevitably produce "phase grams". Therefore, phosphate fertilizer should be used as the base fertilizer or basal fertilizer, zinc fertilizer should be used as a topdressing fertilizer. Nitrogen, phosphorus, potassium and other large-element fertilizers should be based on rhizosphere topdressing, and micro-fertilizers should be applied by foliar spraying.

4. Narrow contact area. Nitrogen and potassium fertilizers can be applied by spreading methods; phosphorus fertilizers can be applied by concentrated fertilization; micro-fertilizers can be used by seed dressing, soaking, and dipping roots, so that trace elements are confined to a smaller range of the roots, and as far as possible Elemental contact.

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Pelvic External Fixation

There are two kinds of external fixations for pelvic fractures, namely temporary fixation and therapeutic fixation.

Temporary fixation depends on on-site assistance. Assuming that the patient has serious open injury, severe hemorrhagic shock, and serious fracture dislocation, the rescue personnel will provide temporary external fixation support to maintain the stability of the pelvis, reduce secondary injuries, and correct the continuous aggravation of hemorrhagic loss on the scene. The therapeutic external fixation stent is used to correct the dislocation of the fracture through routine examination after admission, evaluation of the injury, and external fixation installation through treatment, maintain the relative stability of the fracture, create a very quiet environment for the fracture healing, and lay the foundation for the healing of the fracture. External fixation is an important method for pelvic fractures.

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