The cabbage field should be based on the re-application of nitrogen fertilizer. The use of fertilizer should master the principle of “light before and then heavyâ€. The top dressing should be carried out in 2~3 times. The first top dressing should be in the early stage of the rosette, applying 10~15 kg of urea per mu. The potassium sulfate is 5~10 kg, and the new high-fat film 800 times liquid is sprayed to increase the utilization rate of the active ingredients of the nutrient. Generally, ternary compound fertilizer can be used to enter the ball-forming period, and the dosage per acre is about 50 kg, and the application is applied twice in the initial and middle stages of the ball. At the same time, it should be applied by foliar application. It can be sprayed with 0.3%~0.5% calcium chloride to apply 800 times liquid of new high-fat film. Once every 7 days, it can be controlled for 2~3 times, and the application of micro-fertilizer can be applied. Boron is more sensitive, and the lack of boron fertilizer has a greater impact on yield. For boron-deficient soils, boron fertilizer should be applied. Boron fertilizer can be used as base fertilizer, 1 kg of borax per acre, mixed with other fertilizers, and applied to the soil. If the base fertilizer and boron fertilizer are insufficient, spray 0.1%~0.2% borax solution and 800 times liquid of new high fat film in the rosette agricultural technology period to the ball-forming period, spray once every 6~7 days for 2~3 times, and The timely application of strong stems in the growth period of Chinese cabbage can make the stems of the plants thick, the leaves are thick, the leaves are fresh and tender, the plants are flourishing, and the natural taste is strong. At the same time, it can improve the ability to resist disasters, reduce the amount of pesticides and fertilizers, and reduce residual toxicity.
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Installation and use should be relatively simple, mainly reflected in two aspects: one is that the installation and debugging of the camera itself should be relatively simple, and the other is that the operation of the client should be relatively easy to get started. Regarding the installation location and height, we have chosen a height of about 3 meters as a suitable installation location. This not only ensures good visibility, but also prevents the camera from being easily damaged by people
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3. To support multiple recording storage modes, not only local storage but also cloud storage should be supported.
Four. In the process of purchasing cameras, it is best not to be greedy for cheap prices and not simply pursue cheap prices. It is necessary to comprehensively consider factors such as the stability and clarity of the camera head. Whether the operation of the camera head is stable is determined by the 40 modules in the middle
The clarity is determined by the image sensor.
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