After the melon is planted, timely topping and picking the heart, pay attention to the removal of the deformed melon. Distribute the vines and the sun vines evenly, and press the clods on the vines. Cut out the old leaf disease leaves at the right time and bring them out of the field. Spray “General Tree Protector†to disinfect and prevent the spread of pests and diseases.
Melon roots are developed, but the distribution is shallow. In the period of melon expansion, sufficient fertilizer and water supply is needed, but it is necessary to prevent waterlogging. Melon is made by plowing the bottom fertilizer, and the bottom fertilizer is best to have cake fertilizer. Melon is not suitable for nitrogen fertilizer alone. After planting, before flowering and fruit setting, the topdressing is usually 2-3 times, and it is better to use the decomposed thin human urine. In order to prevent the growth of the seedlings, the appearance of the seedlings is too long, affecting the fruit setting. According to the "Agricultural Resources Taobao Guide", when the foliar spray fertilizer is applied, the spray is combined with the appropriate amount of "fruit and fruit", which not only improves the utilization rate of fertilizer, but also regulates nutrition. Growth to reproductive growth, preventive growth, promote early flowering and more flowering, fruit development can promote the rapid expansion of melon, fruit and fruit. 7 days before the harvest of melon, stop the supply of fertilizer and water to ensure quality.
When the medicament is used to control melon powdery mildew, downy mildew, anthracnose, and wilt, add appropriate amount of “new high-fat membrane†to improve the efficacy, moisturize and prevent phlegm, reduce the breeding of pests and diseases under the rainy weather, and have better effects on various fungal diseases. The prevention and treatment effect, because its disease prevention is a physical effect, the bacteria will not produce drug resistance.
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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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