Greenhouse fruit and vegetable in the fertilization technology should pay attention to the application of basal fertilizer, fertilizer fertilizer technology should pay attention to the following points: 1. Fertilizer generally use urea or ammonium sulfate, each dose per acre is 10 to 20 kg, it is best to make 0.2% ~0.4% solution for liquid topdressing, not suitable for dry application, should be used "light fertilizer ground facilities." 2. The time and number of topdressing vary with the type of vegetables. Tomato topdressing 3 to 4 times cucumber 5 to 10 times. In the seedling stage, fertilizers can be appropriately applied. After the fruits are swollen, the top-dressing fertilizers can be used to promote early maturation and high-yield production. In the middle and back areas, fertilizers should be top-dressed to increase the total yield. 3. The top dressing should be combined with irrigation, and ventilation should be carried out after dressing. 4. In the greenhouse can also be used to topdressing foliar spray method, the general spraying urea concentration, tomato 0.5% for the cucumber 0.5% to 1%. Under greenhouse protection, under the protection of the greenhouse, the fertilizer will not be lost with the rainwater, so the fertilizer utilization rate is high, but the salt in the soil solution is easy to accumulate, which may cause the soil solution concentration to be too high, and even cause the death of the vegetables. In summer and autumn, the cover film on the greenhouse will be uncovered to allow rain to pour in, so as to reduce the damage.
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1. Select a low-power controller. The controller will work 24 hours a day. If its power consumption is large, it will consume part of the power. A good choice is a controller that consumes less than 1 mA.
2. Select a controller with high charging efficiency. The controller of the MCT charging mode can automatically track the high current of the panel. Especially in winter or periods of insufficient light, the efficiency of MCT charging mode is about 20% higher than other charging modes.
3. Select the controller for bidirectional power regulation. Controllers with power regulation have been widely promoted. When there are few pedestrians at night, one-way or two-way lighting can be automatically turned off to save electricity. It can also adjust the power of the LED lights.
In addition to the above power-saving functions, attention should also be paid to the protection functions of the controller for components such as batteries. In addition, when setting the under-voltage protection value of the controller, try to adjust the under-voltage protection value to ≥ to prevent the battery from over-discharging.