Mainly organic fertilizer, supplemented by inorganic fertilizer. Formulated according to the grape variety, development stage and soil fertility; can improve soil structure, increase soil microbial activity, increase soil organic matter content, improve soil fertility; avoid harmful substances entering the soil, control pollution, and protect the environment.
Second, the fertilization method:
The base fertilizer is suitable for autumn application, and the topdressing is carried out according to the key growth period of the grape. It is not advisable to apply chemical fertilizers within 1 month before harvest. For limited use of chemical fertilizers, such as urea, potassium dihydrogen phosphate, superphosphate, etc., should be mixed with organic fertilizer or microbial fertilizer. The ratio of organic nitrogen to inorganic nitrogen is 1:1, which is equivalent to the ratio of 1000 kg of farmyard manure plus 20 kg of urea.
LED Lamp Bead light-emitting principle
The terminal voltage of the PN junction constitutes a certain potential barrier. When the forward bias voltage is applied, the potential barrier drops, and the majority carriers of the P region and the N region diffuse to each other. Since the electron mobility is much larger than the hole mobility, a large number of electrons will diffuse into the P region, which constitutes the injection of minority carriers into the P region. These electrons recombine with holes in the valence band, and the energy obtained during recombination is released in the form of light energy. This is the principle of PN junction light emission.
Features of LED Lamp Beads
1. Voltage, LED lamp beads use low-voltage Power Supply, and the power supply voltage is between 2 and 4V, which varies according to different products, so it is driven by a high-voltage power supply. Safer power supply, especially for public places.
2. Current, the working current is between 0 and 15 mA, and the brightness becomes brighter with the increase of the current.
3. Efficiency, energy consumption is reduced by 80% compared with incandescent lamps with the same luminous efficiency.
4. Applicability, very small, each unit LED chip is 3 to 5 mm square, so it can be prepared into various LED lamp bead shaped devices, and is suitable for variable environments.
5. Color, changing the current can change color. The light-emitting diode can easily adjust the energy band structure and band gap of the material through chemical modification methods to realize red, yellow, green, blue and orange multi-color luminescence. For example, an LED that is red when the current is small, can turn orange, yellow, and finally green as the current increases.
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