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l their daily vitamin and fiber needs. China has 160 million〓 hectares of farmland dedicated to growing vegetables. To grow them, fa〓rmers use more than 311,000 metric tons of pesticide and 59 million ton〓s of fertilizer a year, said Li Shaohua, director of San'an Sino-Scienc〓e's Photobiology Industry Institute. "The excessive yet inefficient us〓e of fertilizers and pesticides has done great harm to our environment,〓" he said. "It's higL

h time we find a sustainable and green way to prote〓ct our food security." San'an Sino-Science was founded in 2015 by San'〓an Group and the Chinese Academy of Sciences' Institute of Botany. The 〓second-generation plant in Anxi can produce 1.5 tons of vegetables, suc〓h as lettuce and cabbage, a day. At full capacity, when the energy cos〓t is neglected, it can produce 1,000 tons of leafy greens a year in the〓ory, according to Li. "The higf

h productivity is mainly because we try t〓o emulate the most ideal natural conditions for plant growth, and use t〓echnologies to cater to their every needs." Before entering the plant 〓factory, visitors must put on a dual-layered jumpsuit, goggles, a face 〓mask, rubber gloves and boots, and be disinfected from head to toe. Sne〓ezing in the factory is strictly prohibited. "The standard here is str〓icter than hospital operating rooms," say

ources,"〓 the factory's executive manager, Zhan Zhuo, said. "The technology wou

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course in the most ideal conditions." The req〓uirements for plant growth fall into two broad categories: photosynthes〓is and soil nutrients. The sun accounts for 90 percent of all botanic 〓bioenergy through photosynthesis a process in which plants combine car〓bon dioxide and water and turn them into carbohydrates and oxygen. Sunl〓ight is a bundle of different wavelengths of light across a wide spectr〓um from ultraviolet to infrared. Plants are "picky eaters that favor b〓lue and red lights", Li said. "If we can figure out what ratio and comb〓ination of lights are best suited for each plant's growth, then we can 〓change or create LED lights that shine at that specific intensity and s〓pectrum, saving lots of energz

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