Due to the low temperature in winter, some fertilizers are more suitable for application, while others are not suitable.
It is suitable to apply ammonium carbonate in winter, the temperature is low, and ammonium carbonate is not easy to volatile and decompose, which is conducive to improving fertilizer utilization rate. Ammonium bicarbonate is an ammonium nitrogen fertilizer, which can be directly absorbed and used by crops after being applied to the soil. , Can provide nitrogen nutrition for crops in time. According to tests, the application of ammonium bicarbonate in wheat fields in winter increases the fertilizer efficiency by 1 to 1.5 times in the high temperature season.
Avoid urea Urea belongs to ammonium nitrogen fertilizer. It cannot be directly absorbed and used by crops after being applied to the soil. It needs to be converted into ammonium nitrogen by the urease secreted by urea bacteria in the soil to be absorbed by the root system. The rate of urea conversion depends mainly on soil temperature. If all the urea applied to the soil is converted to ammonium nitrogen, it takes 7 to 10 days at a ground temperature of 10 ° C, 4 to 5 days at 20 ° C, and only 2 to 3 days at 30 ° C. It can be seen that when crops are topdressed in winter or early spring, if urea is applied, it will often affect crop growth because of slow fertilizer effect.
Increased application of phosphorus and zinc fertilizers The absorption of phosphorus and zinc by crops was significantly affected by temperature and light. Low winter temperatures and insufficient sunlight can easily induce phosphorus and zinc deficiency in winter crops. Phosphate and zinc fertilizers should be added appropriately. In addition, phosphorus can enhance the cold resistance of plants, and increasing the application of phosphorus fertilizer is beneficial to the prevention and cure of crop freezing damage.
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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.
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