The crops are topdressed during the cold season in winter and ammonium bicarbonate is more effective than urea.
One is that ammonium bicarbonate is an ammonium fertilizer that can be directly absorbed and utilized by crops when applied to soil. Under normal conditions, if urea is applied to the soil, it needs to be completely converted to ammonium nitrogen. It takes 7 to 10 days for a ground temperature of 10°C, 4 to 5 days for 20°C, and 2 to 3 for 30°C. day. It can be seen that crops are topdressed in winter or early spring, and ammonium bicarbonate is more effective than urea.
Second, the utilization rate of ammonium bicarbonate is very low when the temperature is lower than 20°C. After being applied to the soil, ammonium ions can be rapidly adsorbed by the soil colloid, and the adsorption power is 8 times that of urea. Therefore, it is not easy to lose water. After the urea is applied to the soil, it is present in a molecular state before it is converted into ammonium nitrogen, which is difficult to be adsorbed by the soil colloid and is easily lost.
Third, the effect is good Tests have shown that topdressing ammonium bicarbonate in winter wheat field, its effect is increased by 1 to 1.5 times than in the hot season.
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1. Introduction
The total viral nucleic acid extraction kit is suitable for extracting total viral nucleic acid from serum, plasma, tissue homogenate and other samples. The kit is based on silica column purification technology, which eliminates the need for toxic phenol-chloroform extraction and time-consuming alcohol precipitation. This product has successfully extracted nucleic acids from hepatitis B A/C, hepatitis C, and norovirus standard. The obtained DNA/RNA can be directly used in a series of downstream experiments such as PCR, RT-PCR, and LAMP.
Notice:
1. The carrier RNA solid must be dissolved in Nuclease Free Water to 1µg/µl before use, and vortex to dissolve. Store in aliquots at -70°C. If you need to store it at -20℃ for a long time, please repackage it according to the number of times of use.
2. Dissolve Proteinase K (20mg/ml): Add Proteinase Dissolve Buffer to dissolve Proteinase K to a final concentration of 20mg/ml. Proteinase K dry powder can be stored at 2-8°C for one year, but dissolved Proteinase K must be stored in aliquots at -20°C. Repeated freezing and thawing of Proteinase K can affect its activity.
3. Buffer VHB must be diluted with 14 ml absolute ethanol before use and stored at room temperature.
4. Buffer RW2 must be diluted with 80 ml of absolute ethanol before use and stored at room temperature.
3. Shelf life
Except for Proteinase K and Carrier RNA, other components of this product can be stored at room temperature (15-25°C) for 12 months, and should be stored at 2-8°C for long-term storage. Proteinase K and Carrier RNA dry powder are transported at room temperature. Please store at -20°C after receiving the test product, and store at -20°C after dissolving.
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