In recent years, the market prospects of Chinese herbal medicines are good, especially in the heavy building. It can be said that it is a dark horse, and the price is high. Let's take a look at the cultivation techniques of the heavy building.
First, growth and development habits
The growth period of the 滇é‡æ¥¼ is long, up to 9-10 years, and it is initiated from the seed. It takes 5 to 6 years for vegetative growth and development, and then enters the reproductive growth phase and begins to flower. At this time, the stems on the ground were increased and thickened, the number of leaves increased, flowers and fruits appeared, and the roots and stems were also significantly thickened. This period is a period of vigorous growth and development. The plants usually emerge from April to May, and the stems are usually singular, but there are also 2 or 3 strains. The flowering period is from April to June. After the stems are taken out, the flower buds have grown at the top of the stems and are contained in the unexpanded leaf plexus. After 2 to 3 days, the flower parts are exposed, the peduncle is elongated, and the leaves and flowers are unfolded. From September to November, the seeds matured, the capsules cracked, and the seed coats turned from light red to deep red, and naturally fell off after maturity.
The number of leaves in the sorghum building usually increases with the increase of the age of the rhizome, and the number of leaves at the flowering age tends to be stable. Generally, there are 1 heart-shaped leaf in the first year and the second year, 3-4 pieces in the third year, 4-5 pieces in the fourth year, and 4-6 pieces in the fifth year. After the sixth year, the plants reach flowering. Age, the number of leaves began to fix. At the same time as the number of leaves increases, the shape of the leaves changes accordingly. The earliest is a single heart-shaped leaf, followed by a number of round leaves, the leaves are oval-oblong, and the base is obtuse.
Second, the requirements for soil and nutrients
Planting 滇 heavy building has strict requirements on soil. It requires neutral sandy loam with deep, loose and fertile, high organic matter content, and the terrain should be flat, with natural irrigation conditions, convenient drainage, avoid water accumulation in the rainy season, and reduce disease occurrence. In the loam where frequent excavation, organic matter content or quick-acting fertility is high, the soil is well ventilated and fertilized, and the sorghum building grows well and can obtain higher yield. Soil compaction, sticky soil with poor soreness and low-lying land with poor drainage are not conducive to the growth of the heavy building, and should not be used to plant the heavy building. In addition, trace elements such as magnesium, zinc, molybdenum, and calcium are important for the growth of the sorghum building. If these elements are absent from the soil, artificial foliage spraying can be performed.滇é‡æ¥¼ has higher requirements for nutrients, neither can it be dry or affected, and the rainfall in the planting area is required to be concentrated in June-September, and the air humidity is 75% to VII. When planting a heavy building, the shading of the constructed shed should be 60% to 70%, and the scattered light can effectively promote the growth of the squat building.
Third, the requirements of the climate
滇é‡æ¥¼ is warm, wet, and shade-resistant, fearing freezing and direct sunlight. Higher air humidity and concealment are required during growth. It grows well in areas where rainfall is concentrated, especially on the banks of the river, on the edge of the ditch and on the slopes of the shady slopes. Climate indicators: 1600 meters to 3100 meters above sea level, the annual average temperature is 10-15 ° C. The frost-free period is more than 240 days, and the annual rainfall is 850-1200 mm.
The above is the cultivation technique of the heavy building. When friends are planting, they should consider these factors. First, it depends on whether the local area is suitable for planting. Second, they must look at their own funds. Third, they must look at their own cultivation techniques. Fourth, they must pay attention to this. In the past few years, the area of ​​artificial planting in China has been expanding. Once it is produced, the price may come down. Therefore, it is necessary to consider it clearly, so as to avoid high investment and low income!
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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