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. venous cannulation,best veins for cannulation,venous cannulation set,venous cannulation technique Yong Yue Medical Technology(Kunshan) Co.,Ltd , https://www.yypcr.com
The prevention methods are as follows:
1. Improve cotton farmers' understanding of increasing potassium fertilizer, because increasing potassium fertilizer can not only accelerate cotton flower bud differentiation, reduce bud bell falling off, but also promote cotton plant's absorption of nitrogen fertilizer, increase cotton leaf function and production stamina.
2. Rational application of potassium fertilizer. The absorption of potassium fertilizer in cotton during the whole growth period is generally less in the early stage, more in the middle and late stages, and the absorption of potassium fertilizer after flowering accounts for about 80% of the whole growth period. Therefore, about 12.5 kg of potash should be applied per mu of cotton field, and about 7.5 kg should be applied in the bud stage. Potassium phosphate such as potassium dihydrogen phosphate can be sprayed in the middle and late stages, sprayed once every 7 to 10 days, and sprayed about 3 times.
Prevention and treatment of potassium deficiency in cotton fields
The symptoms of potassium deficiency in cotton fields are manifested in the flowering and ringing stage of cotton. The leaf color of the upper leaves of cotton main stems turns from pale yellow to dark green. Yellow spots appear in the green veins, then brown, and then the leaves shrink, brittle, reddish brown and fall off, cotton bolls are thin, easy to premature aging, analysis of cotton stem vascular end of the tube is not infected, and verticillium The end of the vascular stem of the cotton plant was yellowish brown.
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