According to investigation and analysis, apple orchards are not suitable for intercropping of alfalfa, celery, waterweed, flax, wheat, potato, castor, cotton, tomato and other crops, because these crops compete with fruit trees for water and fertilizer, serious diseases and insect pests, affect the robust growth of fruit trees, and reduce yield.
1. Alfalfa, celery, waterweed, flax. Alfalfa, celery, waterweed, and flax are planted between the rows of apple orchards, which antagonize the apples, compete with the fruit trees for water and fertilizer, and breed and spread pests and rodents. Alfalfa root secretion also inhibits fruit tree growth, so it is not appropriate to intercrop these four crops.
2. Wheat, potato, castor. Wheat, potato, and castor are the hosts of the apple red spider. The red spider is transferred to the apple tree to suck the leaf juice, causing the fruit tree to fall and fall.
3. Cotton and tomatoes. Cotton, tomato and apple trees are intercropped with cotton bollworm.
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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.
SARS-Cov-2, One test type that uses a sample from a nose or throat swab in a 'PCR test'. The goal is to make enough copies of the viral cDNA in order for it to be detectable.
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