Autumn and winter cabbage cultivation management technology specific explanation
The cabbage is also called cabbage, which is a variant of cabbage. Many people in life are very fond of cabbage, so the cabbage is also popular in the market. The cabbage is more adaptable and can be heat-resistant or cold-resistant. Then Xiaobian is here to introduce the planting management techniques of autumn and winter cabbage.
First, the sowing time of the cabbage
Cabbage can be planted in the open season in the spring, summer and autumn in the north. If it is planted in summer, planted in autumn, harvested in autumn and winter, it is called autumn and winter cabbage.
Second, the sowing seedlings of cabbage
Areas in the Yangtze River Basin can choose dry, ventilated, well-drained plots, sowing in late July-August, and using shading nets to raise seedlings. After the emergence of the cabbage, the shading net was removed. After 15 days, the cabbage seedlings were seeded at 2 leaves and 1 heart, and the toppings were applied once after the living.
Third, the cultivation of the vegetables
Before the selection, the plots of the cruciferous crops that have not been planted are planted, and after deep cultivation, the deep ditch is made. Apply an appropriate amount of base per acre. When the seedling age is about one month, choose cloudy or sunny days to plant after 4 pm, determine the planting density according to the variety, and pour the living water after planting.
Fourth, the field management of cabbage
Water and fertilizer management is mainly promoted, with emphasis on fertilization in the late stage of the rosette and in the early stage of the core. In the early stage, nitrogen fertilizer was the main factor, and phosphorus and potassium fertilizer were the main medium and late stage. Apply top dressing 3-4 times, and timely weeding and weeding. In the later stages of the ball, the number of watering and the amount of watering are controlled to avoid splitting the ball.
V. Disease prevention and control of cabbage
The diseases of the cabbages planted in autumn and winter occur lightly, and generally do not need to be controlled, but the pests occur seriously, and attention should be paid to prevention and timely.
After doing the seeding and seedling cultivation of the cabbage and the management of the field, when the cabbage is ripe, the harvest can be harvested according to the purpose. When harvesting, it can be cut from the surface neck of the ground with a knife, and packaged according to the size of the leaf ball.
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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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