1, leafy vegetables do not apply ammonium nitrate. Leafy vegetables, such as Chinese cabbage, Chinese cabbage, leeks, celery, cabbage, etc., easily absorb nitrate nitrogen fertilizer during growth. If leafy vegetables are applied with ammonium nitrate, leafy vegetables absorb nitrate ions. Consumers eat leafy vegetables that use ammonium nitrate, and salt ions will enter the consumer, resulting in chronic savings. Sexual poisoning.
2, avoid foliar spray high concentration of nitrogen fertilizer. If the vegetable foliar spray is used with urea, thiamine, etc., although the vegetable leaves are colored green, the content of harmful salts in the vegetables is significantly increased, thereby affecting the health of the consumer. Therefore, leafy vegetables should be prohibited from spraying high concentrations of nitrogen fertilizer.
3, the shed indoors avoid high-concentration ammonium nitrogen fertilizer. Due to the high temperature and high humidity in the shed, the high-concentration ammonium nitrogen fertilizer is easily decomposed under the action of soil enzyme under suitable temperature and humidity conditions, and is converted into gaseous ammonia, which is extremely stable under the conditions of greenhouse closure. It is easy to cause vegetable poisoning, reduce the yield and quality of vegetables, and even cause vegetable poisoning death in severe cases.
Precautions for efficient fertilization of vegetables
1. Avoid repeated administration of thiamine. In the vegetable field of acid soil or calcareous soil, if the thiamine is applied several times in succession, the soil will become more acidic, causing the calcareous soil to be squashed, leading to poor growth and development of vegetables, hindered absorption of nutrients, and degraded quality. The benefits are reduced.
2, avoid applying urea after watering. The nitrogen component contained in urea is an amide nitrogen. The amide nitrogen can be absorbed and utilized by vegetable roots after being converted into ammonium sulfate or ammonium hydrogencarbonate by urease secreted by soil microorganisms. If water is applied or rained immediately after urea application, the amide nitrogen is lost. Therefore, whether urea is used as the base fertilizer or top dressing of vegetables, it should be re-watered after 5~6 days after application, so as to avoid nitrogen loss. Agricultural Technology
3, avoid the use of carbon ammonium in water shortage. The chemical nature of ammonium bicarbonate is extremely unstable and is easily lost. Therefore, when applying ammonium bicarbonate in vegetable fields, whether it is base fertilizer or top dressing, deep application should be carried out in the case of wet vegetable fields, and the soil should be covered immediately after application to avoid the loss of fertilizer effect.
Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone
PCR ( Polymerase Chain Reaction)
It provides a way to make more copies of a portion of DNA.
We need to have PCR ingredients that include DNA portion, Buffer solution, Primer+DNA (tap polymerase), and Nucleotides during the preparation step.
In the step of PCR sequence, there are three steps in this section.
Step 1 Denaturation
The addition of heat is needed to separate the two strands of the DNA molecule.
Step 2 Annealing
Temperature, is going to be cool in this step, should allow the primers to bind to the specific segments.
Step 3 DNA Synthesis
To make more copies of the DNA.
Those three steps above keep repeating to make enough copies of the DNA fragments. It is the principle of how PCR machine works.
Superyears General 2215 RT-qPCRadopts all-in-one with an industrial art design, combining the Analytical Instrument, Large touch screen, and Computer. General 2215 RT-qPCR is equipped with the proven thermal-cooled electric technology, which can recognize the speed rate of temperature control faster and obtain high-quality testing results within 40 minutes. To ensure the sensitivity and stability of the testing a design with traditional beam path with a susceptible CMOS image sensor is used. In addition, General 2215 supports multiple PCR analysis and High-resolution Melt Curve (HRM) analysis, compatible with the mainstream reagent kit in the market. It will be the best assistant and your preferred RT-qPCR.
Real-Time Pcr Instrument,Real Time Pcr Machine,Real-Time Ploymerase Chain Reaction,5 Channel Real-Time Pcr Instrument
Nanjing Superyears Gene Technology Co., Ltd. , https://www.superyearsglobal.com