Broccoli, also known as green cauliflower, is often cultivated in the Jiangsu, Zhejiang and Shanghai regions, and is more suitable for planting in spring and the current autumn. The nutritional value of broccoli is very rich. It is a common vegetable on people's table. There are also many organic varieties at present, and many novices of broccoli planting often end up in the harvesting process. So what is the harvest standard of broccoli? How to harvest broccoli correctly? Let's take a look today.
The harvest standard of broccoli
The harvest standard of broccoli
Broccoli should be harvested at the right time according to the characteristics of different varieties. If it is harvested too early, the curd will not be fully developed; if it is harvested too late, the curd will be loose and the surface will be uneven, which will deteriorate the quality of the curd. This has a very bad impact on its output and quality.
Generally speaking, the harvest standard of broccoli is: the flower bulbs are fully enlarged, the surface is round and right, the edges have not been spread, the flower bulbs are tighter, and the color is dark green.
Harvest time of broccoli
It is generally recommended to harvest at 6-7 in the early morning, which can effectively avoid direct sunlight, rain, etc., of course, it can also be harvested in the evening, but pay attention to ventilation and cooling, and put it in an open air at night, and load the car in the next morning. Foreign transport.
Harvest time of broccoli
How to harvest broccoli
1. Harvesting methods for fresh-keeping export
When harvesting, it is recommended that the flower bulbs and stems with 3 to 4 leaves should be harvested together. There should be 14 cm from the top of the flower bulbs to the bottom of the stem. After harvesting, install them in a plastic frame and send them to the factory for processing immediately.
2. The harvesting method for the cutting and dewatering outlet
The flower bulbs are fully grown and harvested before the flowers are scattered. Generally, the flower bulbs are harvested when the diameter of the flower bulbs is 13~15 cm. When harvesting, the flower bulbs should be harvested together with 3~4 leaves on the stem. Allow 12 cm from the top of the ball to the bottom of the stem. After picking up, install it in a plastic frame and send it to the factory for processing immediately.
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Plant extraction process
1. Select plants/herbs. No more than ancient prescriptions, prescriptions, folk herbs to find. At present, common and uncommon herbs have been studied. At present, it is mostly to increase the amount of medicinal materials to extract and separate components with low content, or to find medicinal plants that have never been studied from miao medicine, Tibetan medicine, Mongolian medicine, Africa, Latin America and other places.
2. The extraction. Solvent petroleum ether, n-hexane, cyclohexane, benzene, chloroform, ethyl acetate, n-butanol, acetone, ethanol, methanol, water (low polarity → high polarity). Daily medicine decoction effective, water and ethanol and other solvents with large polarity, such as artemisinin boiling ineffective extraction with petroleum ether and other solvents with small polarity. Common medicinal materials water/alcohol/ether to go through, separation and identification of more compounds.
3. The separation. This is the most important work. In the solution extracted from the second step, there are dozens of compounds, usually by column chromatography, which is often referred to as the column flushing. It's a lot of work, it's boring, it's low tech. A master's student might do this every day for two years. The column for separating compounds, as shown below, is as large as 2 meters high and as small as 10 centimeters. Change the solvent condition of mobile phase, change the material of column, different conditions and different separation principles of column repeatedly punching, can be separated from the monomer compound.
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