Spinach is rich in carotene, vitamin C and other nutrients, and it tastes delicious. Therefore, it is favored by many consumers. Its market demand is also good, attracting many growers to plant. However, in the near future, farmers have reacted, and spinach has a yellow leaf phenomenon. What is going on?
First, the reason for the yellow leaves of spinach
1. Improper fertilization
Spinach has a large demand for nitrogen and potassium fertilizers, but it is also required to be proportioned. In addition, the growth of spinach also requires micro-fertilizer. If the micro-fertilizer is lacking, spinach will also have yellow leaf phenomenon. In this case, some foliar fertilizer can be applied later.
2, too much watering
If there is too much water in the spinach field, there will be water in the ground, which will make the roots of the spinach lack oxygen, causing poor growth, and spinach will also have yellow leaves. Generally, you can use chopsticks to insert into the soil to see if it is short of water. As long as the soil is kept in a wet state, it is no longer necessary to water it.
3. Soil problems
If the soil is poorly permeable, the spinach will also grow poorly, and yellow leaves will also appear. The soil is best refurbished so that it is more breathable.
4, normal yellowing
If the leaves under the spinach grow new roots from the leaf axils, it is normal for the spinach leaves to turn yellow. This situation does not matter, it is a metabolism of spinach itself.
Second, how to solve the yellow leaves of spinach
1. When choosing spinach, choose a well-ventilated zone. When encountering a dry climate, water the spinach in time so that the chance of yellowing of spinach leaves is less.
Before planting, the seeds of spinach should be disinfected. Try to choose seeds without disease. In the ground, some silver-gray membranes can be used to deworm, and the ground should be weeded frequently. If you find a diseased spinach, remove it in time. It can be added with phosphate fertilizer, potassium fertilizer, and the resistance of spinach is enhanced, and the chance of getting sick is much less.
2, when the spinach leaves just turn yellow, you can spray some plant disease or spray some anti-toxic agents are all possible. If the spinach has downy mildew, it can be sprayed at the beginning.
3. Water and fertilizer management must be supplied in a timely manner. The fertilizer should be scientific, and it should not be biased to apply a certain fertilizer, but also to increase the application of micro-fertilizer. It is necessary to weed the normal loose soil and keep the soil loose and breathable. Also avoid the ground is too humid, the soil has a certain amount of water holding capacity.
The above is the reason and solution for the yellow leaves of spinach. If the farmers have yellow leaves when planting spinach, it is necessary to prescribe the right medicine and master the above solutions.
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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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