Chinese cabbage has a large planting area and a large market demand. It is a vegetable grown by vegetable growers all the year round. The family grows cabbage in the open field, mostly in the autumn, and it can be planted one after another every year before and after the autumn; the sprouting of the Chinese cabbage is easier, and the seed is usually released after sowing seeds for about 3 days. How to manage after emergence? Let's take a look at the following.
Although Chinese cabbage is easy to emerge, management is very important during the seedling period before the rosette period; if it is not properly managed in the early stage, it may affect the yield and quality in the later stage. Therefore, in order to produce high-yield and high-quality Chinese cabbage, we must do a good job in field management from the seedling stage after sowing seedlings.
Baoding seedling
After the seeds are sowed, the Chinese cabbage should be kept moist in the field. When it is dry, it should be watered and simmered until the Chinese cabbage is ripe, and the soil should be kept moist. When two true leaves are grown, it is necessary to remove seedlings, weak seedlings, and malformed seedlings. At the same time, the field should not be too dry, avoiding insects such as aphids and reducing the risk of viral infection. After the first time after the seedling, the pests mainly based on aphids can be prevented in advance according to the situation, and sprayed with imidacloprid or avermectin.
In order to ensure the consistency of production and management, it is necessary to replant or replant as early as possible to ensure the consistent growth of Daejeon cabbage. 5-6 pieces of true leaves at the time of the second seedling, stay better and worse.
From the beginning of the seedlings, according to the soil fertility and growth conditions, the application of thin farmyard manure, or ammonium sulphate 10 kg per mu, seedlings, and watering once after topdressing. When chasing quick-acting fertilizer, pay attention to the distance between the cabbage and the cabbage, not to be scattered on the leaves, to avoid burning the leaves. After planting, spray urea and potassium dihydrogen phosphate to strengthen the resistance and quality of Chinese cabbage. The seedling fertilizer is more important in the seedling stage. If the early fertility is insufficient, it will affect the growth and development of the Chinese cabbage in the late stage.
Cultivating weeding
Weeding and weeding seems to be an indispensable part of planting all crops. When the first seedling is planted, it can be carried out together with weeding. In the early stage, there are many rains, mainly to remove weed buds. When planting or rainwater is reduced, it can be properly cultivated, loosened, weeded, and cultivated evenly, and can not damage Chinese cabbage. The roots do not cause uneven bumps in the field to prevent water accumulation. In the field of ridge cultivation, pay attention to soil and clear ditch when cultivating.
Pest Control
In the seedling stage of Chinese cabbage, it is important to control viral diseases, downy mildew, mites, cabbage caterpillars, and underground pests. Viral diseases mainly use resistant varieties to avoid excessive drought in the field. In the first time, it is necessary to use drugs to prevent mites and underground pests. For specific medication, see the above mentioned agents.
Scientifically select seedlings, use sterile seeds and seedbeds, maintain reasonable planting density, enhance field permeability and light, avoid excessive water and humidity, and reduce the occurrence of some fungal diseases.
The above is the main point of management of Chinese cabbage seedlings. For the above-mentioned small series, it is a very important part of the management of Chinese cabbage seedlings. If it is not paid attention, it will affect the later production of Chinese cabbage, so we should pay attention to it. Oh.
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Highlights:
> Measurement frequency: 400 Hz (Max 60m 3000Hz)
> Long range: 200m
> High temperatures: -10~+50℃
> UART output
> Connector design: easy to use
Parameters:
|
Accuracy |
±10cm(<50m) /±1%(>50m)* |
|
Measuring Unit |
cm |
|
Measuring Range (without Reflection) |
0.1-200m |
|
Interface options |
Serial/usb/rs232/rs485/bluetooth |
|
Measuring Frequency |
400 Hz |
|
Laser Class |
Class I |
|
Laser Type |
905nm |
|
Weight |
About 20g |
|
VInput Voltage |
8V-36V |
|
Resolution |
1cm |
|
Size |
43*35*21mm |
|
Operating Temperature |
-15℃~50℃ |
|
Storage Temperature |
-40℃~85℃ |
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