Slow release fertilizers slow down the release rate of nutrients in fertilizers by chemical and biological factors, and are affected by many external factors such as soil pH, microbial activity, soil moisture content, soil type and irrigation water volume during release; Fertilizer is a method of coating the water-soluble fertilizer in the membrane to release the nutrients slowly. When the fertilizer particles of the coating are in contact with the moist soil, the moisture in the soil penetrates into the interior through the envelope, so that some of the fertilizer is dissolved. Part of the water-soluble nutrient is slowly and continuously diffused through the micropores on the envelope. The higher the soil temperature, the faster the dissolution rate of the fertilizer and the speed across the membrane. The thinner the membrane, the faster the penetration.
From the perspective of the types of nutrients, the two are also different. Most of the slow release fertilizers are single fertilizers. The main varieties are slow-acting nitrogen fertilizers, also known as long-acting nitrogen fertilizers. The solubility in water is very small. After being applied to the soil, under the influence of chemical and biological factors, the fertilizer gradually decomposes and the nitrogen is slowly released to meet the nitrogen demand of the crop throughout the growing season. The controlled release fertilizer is mostly N-P-K compound fertilizer or a total nutrient fertilizer supplemented with trace elements. After being applied to the soil, its release rate is only affected by soil temperature. However, the effect of soil temperature on plant growth rate is also great. Within a certain temperature range, the soil temperature increases, the release rate of controlled release fertilizer accelerates, and the growth rate of plants increases, and the demand for fertilizer also increases.
There is also the release rate of nutrients consistent with the demand for nutrients at all stages of the plant. Slow release fertilizer release nutrient unevenness, nutrient release rate and crop nutrient demand are not necessarily completely synchronized; the rate of release of nutrients by controlled release fertilizer is in line with the plant's demand for nutrients, so as to meet the nutrient requirements of crops at different growth stages. demand.
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Virus Specimen Collection Tube
Inspection principle:
It can perform protein denaturation on fresh clinical virus samples to inactivate the virus, prevent secondary transmission of infection, and ensure the safety of transportation and testing personnel.
♣.Structural composition: Combination of cotton swab and transport medium (VTM).
♣. Product requirements:
The product should be airtight, avoid high temperature, avoid direct sunlight storage. It should be used in a clean, hygienic, pollution-free, and temperature-friendly environment.
♣, Storage conditions and validity period:
â‘ , the product should be stored in a clean, dry and ventilated environment,
②, the temperature is 5℃-35℃;
â‘¢, relative humidity <85%RH;
â‘£, product shelf life: 12 months.
♣. How to use
â‘ Before sampling, mark relevant information on the label of the sampling tube.
â‘¡. Sampling with the corresponding cotton swabs.
â‘¢ After the collection is completed, quickly put the cotton swab into the collection tube, break the part higher than the sampling tube, and tighten the tube cover.
â‘£. For the specific sampling method, please refer to the following:
a) Nasal swab Gently insert the sampling head into the nasal cavity, stop for a while and then slowly rotate to exit, immerse the collected specimen in the Xiangxiang solution, break the excess part and discard it, and tighten the sampling tube cover.
b) Pharyngeal swab: Wipe bilateral pharyngeal tonsils and posterior pharyngeal wall with the sampling head, immerse the collected specimen in the sampling solution, break off the excess part and discard it, and tighten the cap of the sampling tube.
c), Mycoplasma Chlamydia, Ureaplasma specimen collection
Male: Insert the sampling head into the urethra about 2cm and rotate, stay for a while and then exit, and immerse the collected specimen in the sampling solution.
Female: Wipe the mucus of the cervical orifice, insert the sampling tip into the cervical canal for 1-2 cm for sampling, immerse the collected specimen in the sampling solution, break off the excess part and discard it, and tighten the cap of the sampling tube.
♣. Precautions
1. After the virus is collected, the disposable sampling swab should be completely inserted into the preservation solution, so that the virus can be retained to the greatest extent possible.
â‘¡ The collected specimens must be sent for inspection in time.
â‘¢. It is forbidden to use products with damaged packaging and expired validity period to prevent pollution.
This single-use Virus Sampling Tube is used for in vitro diagnosis. It cannot be used for human or animal oral or external use. If swallowed, it may cause serious events; it is irritating to eyes and skin. If it is not splashed into the eyes, rinse with water.
Virus Sampling Tube,Virus Specimen Collection Tube,Viral Transport Tube,Saliva Virus Sampling Kit
Jilin Sinoscience Technology Co. LTD , https://www.contoryinstruments.com