Excessive application of NPK fertilizer

The hazard of excessive nitrogen supply to crops. The large application of nitrogen fertilizer will also make the cotton buds rare and easy to fall off, the sugar yield of beet roots decreased, the yield of fiber crops decreased, and the fiber quality decreased.

The hazard of excessive phosphorus supply in crops. Excessive phosphorus nutrition will promote the respiration of crops too strong, the dry matter consumed is greater than the accumulated dry matter, causing the reproductive organs to develop ahead of time, causing premature crop maturity, small grain and low yield. Excessive application of phosphate fertilizer will cause the silicon in the soil to be fixed and unable to be absorbed, causing the crop to be deficient in silicon, especially for the grass crops of Si-Si. If you can't absorb more silicon from the soil, if you can't absorb more silicon from the soil, you will suffer from silicon deficiency, such as slender stems, lodging and poor disease resistance.

The hazard of excessive potassium supply in crops. Excessive application of potassium fertilizer will cause the absorption of magnesium and calcium in crops to decrease, causing the occurrence of various diseases such as leafy rot disease and apple bitter disease; hindering the growth of crops, causing crops to fall easily. Symptoms; will cause some of the land's harmful metals and harmful bacteria to exceed the standard, destroy the nutrient structure and balance in the soil, leading to deterioration of soil properties and water pollution; it will also reduce the production of crops, severely weaken the production capacity of crops and reduce production.

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Virus Sampling Tube

There are mainly the following parts: 1. Sampling swab with disposable sterile plastic rod/rayon head 2. Sterile sampling tube containing 3ml of virus maintenance solution (gentamicin and amphotericin B are selected to better inhibit the fungus in the sample. Avoid the human sensitization reaction that may be caused by penicillin in the traditional sampling solution.) In addition, there are additional parts such as a tongue depressor, a biosafety bag, etc. Intended to use 1. It is used for monitoring and sampling of infectious pathogenic microorganisms by disease control departments and clinical departments. It is suitable for sampling of influenza virus (common influenza, highly pathogenic avian influenza, H1N1 influenza virus, etc.), hand, foot and mouth virus and other types of viruses. It is also used for sampling of Mycoplasma, Chlamydia, Ureaplasma, etc. 2. It is used to transport nasopharyngeal swab samples or tissue samples from specific parts from the sampling site to the testing laboratory for PCR extraction and testing. 3. It is used to preserve nasopharyngeal swab samples or tissue samples from specific parts for necessary cell culture. The virus sampling tubes are loaded with infectious substances, and some are even highly pathogenic substances. Therefore, the requirements for packaging containers are very strict, and three requirements must be met at the same time: 1. The safety of transportation. Ensure that the sample does not leak during transportation. Sampling tubes that comply with WHO regulations and biosafety regulations. 2. The security of preservation. Ensure that the sample does not leak during storage. Sampling tubes that comply with WHO regulations and biosafety regulations. 3. The validity of the sample. Make sure that the sampling tube itself will not have a toxic effect on the sample.

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