Plants can contain more vitamins

In February this year, a Japanese plant factory began to use LED as the light source to light the vegetables According to tests, vegetables grown in this way are more nutritious than those grown in the sun Scientists explain that because LED lighting can adjust the wavelength and brightness of light, it is more suitable for the growth of vegetables Light has physical properties similar to sound, as well as wavelength Its physical unit is nanometer As we all know, the wavelength of light determines its color The color of light necessary for plant growth is mainly red and blue, and the ratio is generally 10:1 to 5:1 Sunlight contains a lot of ultraviolet and infrared rays If it is too long, it will also affect the normal growth of plants The main advantage of LED lighting is that it can adjust the wavelength and brightness of light, and at the same time, it can achieve "pulse irradiation" The so-called "pulse irradiation" refers to the practice of high-speed switching LED power supply to release light, similar to flash The principle of "pulse irradiation" is to give plants more rest time between light and dark Because plants, like people, also need rest and energy to grow better According to research data from Japan, when the light and dark frequency of "pulse irradiation" is maintained at 1:2, the growth rate of plants is the highest, 33% higher than that of ordinary plants Only using "pulse irradiation" can increase the volume of vegetables planted by 20% - 25% By adjusting the color and intensity of the LED light source, the vitamin content of the vegetables planted is 1300% more than that of the ordinary vegetables For example, the content of vitamin A, C and E in lettuce grown under LED light source increased 14 times, 3 times and 6 times respectively "Pulse irradiation" also saves electricity According to preliminary estimation, the production cost of vegetables has been reduced by nearly 30% However, the LED lighting used here is not the general household fluorescent lamp The fluorescent lamp at home mainly emits blue light wave, which is not helpful for plant growth The LED lamps for plants used by Japanese experts are mainly red, blue and green primary colors, which can effectively promote plant growth.