Nutritious LED lights
Plants must photosynthesize to grow, so how do they get the energy to grow in a closed plant factory? The answer is LED lights. Plant plants completely replace natural light with LED lights and fluorescent lights, and provide targeted nutrient light for vegetables, and strictly control the environment needed by plant growth, such as temperature, humidity, light, carbon dioxide and nutrients.
Light is at the heart of the plant factory. In the past, similar plant factories mostly used metal lamps and energy-saving lamps as the light source, but due to the large power consumption, they could only be used as a means to supplement light, and could not be used as the main lighting. The LED lamp is an ideal substitute: the chip of the LED lamp is single, which can adjust the ratio of nutrient light for plants, and can artificially adjust the brightness, light quality and light rhythm. In addition, it has the advantages of pure light quality, high light efficiency, low heat and energy saving and environmental protection.
Solar radiation doesn't exactly match plants' needs, but artificial light does. According to the above research results, the lighting on the cultivation shelves of plant factories is divided into three areas: white, red and white. General lighting technology is adopted, which can not only evenly disperse high-directional LED light, but also illuminate different wavelengths of light according to the growth stage of plants. For example, during the early stages of a vegetable's seeding, a mixture of white and red LED light sources is illuminated to encourage photosynthesis. The redder light from a red-blue LED light source is then illuminated to encourage leaf and rhizome growth. Toward harvest, the whiter light is again shone to boost photosynthesis. Not only did they use 40 per cent less electricity and harvest 50 per cent more from the same area than when they used only fluorescent lights.
Because the plant factory's cultivation frame is stacked, the cultivation frame interval is about 35 cm, the total height can vary from 6 to 15 layers (depending on the actual environment, adjustable), occupies less land, the growth cycle is shortened by half. At present, plant factories can cultivate a total of 40 to 50 kinds of vegetables, lettuce, vanilla-leaf vegetables in the majority. The main reason for choosing lettuce is its strong vitality, high production cycle and suitable plant. "the traditional production cycle of lettuce is about 70 days, while in plant plants, the production cycle is only 33 to 35 days."
Growing vegetables with artificial light instead of natural light may raise concerns among some consumers: is the lettuce safe and nutritious enough? Under closed water culture, vegetables can avoid soil pollution and pesticide pollution. Plant plants equipped with temperature, humidity and other equipment, each production link can achieve human control. Another benefit of the closure is that it avoids weather disturbances, allowing prices and yields to remain stable for years.
But plant factories face challenges, the biggest of which is the cost of investment. In fact, the pricing of "high cold" is mainly restricted by the cost, not so expensive, it is difficult to ensure operating returns. "agricultural investment is generally long-term investment, which is very short in the agricultural investment, but the investment return cycle of each factory will vary according to the location and cultivars.