Cabbage is a common vegetable. Many people grow some at home. Autumn is a good time for cabbage cultivation, especially in the north. Now many people are busy planting Chinese cabbage. Chinese cabbage cultivation, in order to achieve high yield and quality, we must do a good job in seedling management, together to understand the main points of management of Chinese cabbage seedlings.
Chinese cabbage seedling
1, seedling management
The main cultivation method for planting Chinese cabbage in autumn is direct sowing, so after the emergence of Chinese cabbage, it is necessary to carry out the seedlings on Chinese cabbage. The Chinese cabbage seedlings can be divided into two parts. The first seedlings are carried out after the Chinese cabbage seedlings grow two true leaves, and the growth is too dense, and the weaker white cabbage seedlings are pulled out. The second seedling is carried out after the Chinese cabbage grows 3-4 true leaves. The spacing of the Chinese cabbage will be fixed. The spacing of the common Chinese cabbage is between 25-30cm, only the growth is robust, no Pests and diseases of Chinese cabbage seedlings.
2, water and fertilizer management
Chinese cabbage is a hi-water crop, but it is not resistant to cockroaches. In order to prevent long-term rainy weather in Chinese cabbage, it is best to plant ridges when planting Chinese cabbage. The ridge planting is not only beneficial to field ventilation, but also Conducive to the discharge of water in the field in time after the rain.
After the Chinese cabbage is planted, it is necessary to replenish the water needed for the growth of Chinese cabbage. Although it has passed the summer holiday season, the weather is still very hot at noon. The cabbage has poor heat resistance, so it is necessary to properly water the ground to lower the ground temperature and maintain the soil. Wet state. In addition to reasonable irrigation, it is necessary to topdress in time. Before planting Chinese cabbage, it is necessary to apply sufficient fertilizer. In addition to the base fertilizer, in the seedling stage of Chinese cabbage, during the lotus period and during the ball-forming period, the fertilizer can be effectively added, and sufficient nutrients can effectively improve the Chinese cabbage. Yield.
Chinese cabbage seedling management
3. Pest control
Common pests and diseases of Chinese cabbage include underground pests, aphids, blight, squatting, downy mildew, etc. The occurrence of pests and diseases seriously affects the growth of Chinese cabbage and reduces the yield of Chinese cabbage. The main pests and diseases of Chinese cabbage are mainly prevention, combined with prevention and control. In the high incidence period of Chinese cabbage diseases and insect pests, timely spraying and prevention, when the Chinese cabbage disease occurs, spraying fungicides and insecticides in time to prevent the spread of germs and insects.
4, bundle management
Many people are too troublesome to plant Chinese cabbage when they grow Chinese cabbage. The elderly in rural areas think that bundling Chinese cabbage is an indispensable process. In fact, if the output of Chinese cabbage is high, it is very important to bind this process. Bundled Chinese cabbage is usually carried out fifteen days before the harvest. You can use sweet potato vines or straw to gently lift the leaves outside the cabbage and tie the straw or sweet potato to two-thirds of the cabbage. Don't be too tight and have a long heart. It should be noted that in the three or four days of bundling Chinese cabbage, water can not be watered. After bundling, small water can be poured to promote the growth of Chinese cabbage.
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Carbohydrazide CAS NO. 497-18-7
Carbohydrazide can act as an oxygen scavenger to prevent corrosion, especially in boiler feedwater systems, rocket propellant assemblies, color image and soap stabilizers, Antioxidant rubber, boiler water deoxidizers and metal passivators. Carbohydrazide can also be used as an anticorrosive agent. Organic synthesis of intermediates.
CAS No. 497-18-7 EINECS 207-837-2
Molecular Formula CH6N4O Molecular Weight 90.08
Attributes:
Carbohydrazide is a white crystalline powder or granule. The effective content of carbohydrazide is from 98.0 to 100.0%.
Specifications:
|
Items |
Index |
|
Appearance |
White crystal line powder or pellets |
|
Active Content (%) |
98.0-100.9% |
|
PH (12% Solution, @ 25 ℃) |
8.45±1.25 |
|
Free Hydrazine |
≤250ppm |
|
Chloride (Cl) |
≤10ppm |
|
Sulfate (SO4) |
≤20ppm |
|
Silica (SiO2) |
≤10ppm |
|
Copper (Cu) |
≤1ppm |
|
Iron (Fe) |
≤4ppm |
|
Sodium (Na) |
≤4ppm |
|
Lead (Pb) |
≤4ppm |
|
Moisture |
≤0.2% |
Packaging and storage:
Pack 25 kg or 50 kg with woven bags or fiber drums.
Store in a cool, dry, well-ventilated area away from incompatible materials. Please close the container when not in use.
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