In a recent report by Reuters, the 2017 National Science and Technology Awards were announced at the annual conference held in Beijing's Great Hall. Among the notable achievements was the second prize for the National Science and Technology Progress Award, awarded to the key technology and system integration of an efficient, low-energy LED intelligent plant factory led by researcher Yang Qichang from the Institute of Agricultural Environment and Sustainable Development.
The research team introduced the concept of a "light formula" for plants, establishing its theoretical foundation and developing energy-efficient LED light sources based on this principle. By understanding how different light spectra affect plant photosynthesis, they created optimized light formulas for various crops at different growth stages. They designed specific LED combinations, such as red (660nm) and blue (450nm) chips, as well as multi-spectral LEDs using blue chips and phosphor excitation. These innovations significantly reduced energy consumption by over 50.9%.
Another breakthrough was the introduction of a light-temperature coupling energy-saving method for temperature control in plant factories. This approach used natural outdoor cooling during the night, reducing reliance on air conditioning. The result was an energy saving of between 24.6% and 63% compared to traditional methods.
Additionally, the team developed a synergistic treatment technique using UV-nano-TiO2 to purify nutrient solutions and employed short-term continuous lighting before harvest to enhance vegetable quality. These methods improved the nutritional content of vegetables, reducing nitrate levels by more than 30% and increasing vitamin C and soluble sugar content.
They also developed an integrated, multi-factor synergy technology that enhanced plant efficacy, energy efficiency, and nutritional value. This led to the creation of three series of intelligent LED plant factory products: mass production models, mobile units, and home-based micro-factories. These systems featured IoT-based intelligent controls, allowing real-time monitoring of temperature, humidity, CO2 levels, and nutrient solution parameters.
The project resulted in 86 patents, including 42 invention patents, with 4 granted internationally in the U.S. Over 112 academic papers were published, including 38 in SCI and EI journals, along with five monographs. The technology has been widely adopted in large-scale production, mobile, and home-use plant factories.
In June 2016, the "Intelligent LED Plant Factory Technology" was showcased at the National "Twelfth Five-Year" Science and Technology Innovation Achievement Exhibition, where it received widespread acclaim. It was hailed as a revolutionary advancement in land use and farming practices.
Professor Feng Shu, a renowned expert in plant factory technology and former president of Chiba University in Japan, praised the research, stating that the Chinese Academy of Agricultural Sciences' work on light formulas, LED sources, and light-temperature coupled environmental control is at the forefront of international standards.
Editor: Yan Zhixiang
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