Vegetable rotation is an effective measure to combat heavy mites, rational use of soil fertility, reduce pests and diseases, and improve planting efficiency. When arranging vegetable rotations, it is necessary to remember and master the following principles:
One is to rotate the vegetables of different families. The same pests and diseases occur in the same vegetables, and the rotation of different vegetables can cause the bacteria to lose their host or change the living environment, so as to reduce or eliminate pests and diseases.
The second is to rotate vegetables that absorb different soil nutrients and different root depths. According to the degree of soil nutrients absorbed by vegetables and the different depths of roots, soil nutrients can be fully utilized.
The third is to pay attention to the effects of various vegetables on soil pH and soil fertility. For example, planting cabbage, potatoes, etc. will increase soil acidity, while planting corn, pumpkin, etc. will reduce soil acidity; onions that are more sensitive to acidity, as corn, pumpkin, and later crops, can obtain higher yield.
The fourth is to consider the inhibition of weeds by the former crops. Some vegetables with long growth period and large leaf area coverage on soil area have inhibitory effects on weed growth; while some types of vegetables are easy to breed weeds due to slow growth at seedling stage or small leaves, so when cultivated The former should be arranged to rotate with the latter.
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4G Mini Camera Structural components
The main structures and components of the camera can be listed from the working principle of the camera:
1. LENS
Lens structure, consisting of several lenses, including plastic lens or glass lens
2. Image sensor
It can be divided into two categories:
CCD (charge couple device): charge coupled device
CMOS (complementary metal oxide semiconductor): complementary metal oxide semiconductor
3. Digital signal processing chip (DSP)
There are many DSP manufacturers, such as VIMICRO 301P/L, SONIX 102/120/128, ST (Logitech LOGITECH's DSP provider), SUNPLUS (SUN+focuses on the development of CIF and VGA for single chip, but the image quality is average), PIXART (original phase), PAC207, SQ930C, etc.
4. Power supply
Two working voltages are required inside the camera: 3.3V and 2.5V. The latest process chip can use 1.8V.
Some cameras also use video transmission lines for synchronous power supply without external power lines.
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