2, formula fertilization. The application of nitrogen, phosphorus, potassium and trace elements is called formula fertilization. According to the test, the nitrogen utilization rate of single application of urea is 30% -38%, while the formula application, the utilization rate of nitrogen is increased by 58%-60%, and the utilization rate of single application of phosphorus fertilizer and phosphorus pentoxide is 12%-14%. For formula application, the utilization rate is increased by 35%-38%; the utilization rate of potassium chloride alone is only 31%-35%, and the application rate is increased by 57%-61%.
3. Deep application of nitrogen fertilizer. The deep application of nitrogen fertilizer can effectively prevent nutrient loss and increase nitrogen utilization rate. According to the test: the ammonium bicarbonate is applied, the nitrogen utilization rate is 28.6%, and the deep application, the nitrogen utilization rate is increased to 58.6%; the urea application, the nitrogen utilization rate is 42%, the deep application, the nitrogen utilization rate Increase to more than 80%, especially the application of ammonium bicarbonate, it is easy to cause crop burning and poisoning.
4. Centralized application. Give limited fertilizer priority to low- and medium-yield fields. According to the test: the same amount of 5 kg of urea and potassium chloride are applied to the fields of high-yield, middle-yield and low-yield fields at the same time. The effect of increasing yield is very different. On average, 1 kg of urea is applied, and high-yield fields increase rice yield 3.5. In kilograms, the middle-income field increased the yield of rice by 5.8 kg, and the low-yield field increased the yield of rice by 8.8 kg.
Venous cannula is also a deep venous puncture catheter. The method is to select the appropriate puncture site and insert the needle under the skin, and insert the needle with negative pressure until the dark red blood is absorbed, indicating that the needle has entered the vein, and the guide wire is inserted. Withdraw the puncture needle to leave the guide wire in the blood vessel, and then insert the venous catheter that needs to be indwelled along the guide wire, then exit the guide wire, inject diluted heparin saline and fix the catheter, the deep venous catheterization is completed. The veins for puncture and catheterization are usually selected clinically, including the subclavian vein, internal jugular vein, and femoral vein. After the puncture catheter is indwelled, attention must be paid to the care of the puncture site to avoid infection with thrombus or catheter falling off.
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