In winter wheat fields, weeds have a peak of emergence from mid-late October to mid-November, and seedlings account for 95%-98% of the total. In late March and early April of the following year, a few weeds emerged. Severe weeds usually come from weeds that occur before winter, and they have high density, large single plant growth, strong competitiveness, and heavy damage. They are the focus of prevention and control. In the winter before the weeds are in the seedling stage, the plants are small, the tissues are tender, and they are sensitive to pesticides, which is an advantageous opportunity for prevention and control.
In the spring of the following year, with the growth and development of weeds, the growth of plants, the strengthening of tissues, the thickening of the waxy layer of the epidermis, difficulty in penetrating, and the relative increase in drug resistance, the use of drugs would be relatively poor. Therefore, chemical weeding in wheat fields should change the old habit of applying pesticides in the spring in the past, and seize the sensitive application period of weeds in the winter. This will not only achieve the best weeding effect, but also reduce the duration of certain field special effects. Herbicides produce phytotoxicity.
The occurrence of winter wheat weeds is related to the cropping, sowing date and cropping system. It is influenced by temperature and precipitation, the temperature is high before winter, the planting is early, the temperature is slow, the rainwater is sufficient, and the weeds are often heavy and the response is light. Winter wheat has a dead grass process in the winter, and the natural mortality rate of weeds in late-wheat wheat fields is higher in cold and dry years, but the mortality rate of weeds in wheat fields in normal sowing season is relatively low.
The nasopharyngeal airway, made of PVC also known as or nose hose, a type of airway adjunct, is a tube that is designed to be inserted into the nasal passageway to secure an open airway. When a patient becomes unconscious, the muscles in the jaw commonly relax and can allow the tongue to slide back and obstruct the airway. This makes airway management necessary. The purpose of the flared end is to prevent the device from becoming lost inside the patient's nose.
Features&Benefit
Type: Horn open, with connector, Silicone reinforced
Nasopharyngeal airway is made of medical grade PVC.
Available with DEHP FREE.
For nasal airway management.
Available with FDA, ISO certificates.
The tube is smooth and easy to be inserted into the nasal cavity
Available Size:4.0mm-9.0mm
Sterile with Ethylene Oxide (EO)
Nasopharyngeal Airway,Medical Nasal Airway,Artificial Nose Airway,Nasal Pharyngeal Airway
Hangzhou Trifanz Medical Device Co., Ltd , https://www.cfzmeds.com