The use of soil fertilizer depends on crops

1, different crops on nitrogen fertilizer response. In order to reduce nitrogen leaching, rice should use ammonium nitrogen fertilizer, especially ammonium chloride, urea better. The application of ammonium nitrogen fertilizer and nitrate nitrogen fertilizer is also effective for corn, wheat and other cereal crops. Potato and sweet potato are also suitable for ammonium nitrogen fertilizer. Ammonium nitrate can improve the quality of tobacco, and ammonium nitrogen can help the flammability of tobacco. Chlorine-containing fertilizers (such as ammonium chloride) reduce the flammability of tobacco.

2. The response of different crops to phosphorus. Legume crops, sugar crops (beet, sugar cane), fiber crops, potato crops, and melons and fruit trees require more phosphorus.

3. Response of different crops to potash fertilizer. Tobacco, potatoes, sweet potatoes, sugar beets, watermelons, fruit trees, etc. require a large amount of potassium, so it is said to be a potassium-loving crop. These potassium-loving crops are free of chlorine.

4. Responses of different crops to sulfur, sodium, chlorine, molybdenum and boron. Potatoes, soybeans, peanuts, and oil are used as sulfur; Sweet Lai is a hi-sodium crop; sodium nitrate is a good fertilizer for sweet lecithin; ammonium chloride is as high as 61%; chlorine crops are forbidden, but they are suitable for cotton and hemp In other crops, chlorine can increase fiber toughness and pull. Legumes, cauliflower, rape and other cruciferous families are molybdenum crops. Rape, cotton, peanuts, fruit trees, etc. are boron-loving crops.

Disposable Virus Sampling Tube

This Disposable Virus Sampling Tube is mainly composed of sample storage tube, sample preservation solution and sampling swab.
This Disposable VTM is mainly used for collection, transportation and preservation of oropharyngeal parts of respiratory and enteric virus such as new coronavirus (COVID-19), influenza, bird flu, hand-foot-mouth, swine flu and so on. It is also suitable for the collection of other viruses, chlamydia, mycoplasma and ureaplasma urealyticum specimen. It is adapted to oral cavity, nasopharynx, virus and DNA collecting etc.

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