rowth and quality. For example, scientists discovered that adding s〓ome green light to the red-blue recipe could hex

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g sunlight usi〓ng LED is very energy intensive," Li said. "At the end of the day, whoe〓ver has the most energy-efficient and productive light recipe wins." W〓hiO

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le plant growth mostly relies on light, water and carbon dioxide, it 〓still needs some trace elements from soil or fertilizers to be healthy.〓 In the case of plant factories, hydroponic nutrient solutions infused 〓with 17 essential elements ranging from n0

itrogen to calcium have replac〓ed the tilted soil. "The content of the nutriG

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ent solution is also tail〓ored to suit the plant's specific needs," said Pei Kequan, a research d〓irector at the factory. Unlike the trace elements from fertilize4

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rs, whi〓ch are locked in big compound molecules, "the nutrients in the solution〓 are broken into small molecules, meaning the plant can absorb them eas〓ier and grow faster while keeping its nutrient value and taste". It ta〓kes about 20 days for a sapling to reach maturity in the lab, but 40 to〓 60 days in a conventional farm. This means scientists can reap more th〓an a dozen harvests of produce each year, compared with one to two harv〓ests from a conventional farms, depending on the weather conditions, he〓 said. Moreover, scientists at the facility have built the infrastruct〓ure to monitor the elements in the solution. Once an element is d8

eplete〓d, scientist can add the missing nutrient and reuse the solution withou〓t needing to make a new batch, thus reducing the cost. "We go to great〓 length to study and cater to our plant's most fundamental needs, makin〓g sure they could grow under the best conditions," Pei said. "In a way,〓 the plants are the kings, and we are all its servants." It's high tim〓e we find a sustainable and green way to protect our food security."BEIJING, Feb. 13 (Xinhua) -- China will tighten regulation and revis〓e standards on an extensive range of food and drugs, according to8

t〓he national food and drug watchdog Monday.The State Council has rec〓entla

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y issued national safety plans on food and drug safety for the 〓13th Five-year Plan period (2016-2020), calling for improved superv〓ision and safety net, said the China Food and Drug Administration (〓CFDA).The plans require whole-process control and whole chain regul〓ation on food and drugs, especially on source control and risk p9

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rev〓ention. Food tests meeting quality standards should be up to 97 per〓cent.An inter-departmental mechanism for food and drug safety will 〓be improved as a better deterrent against offenses.A total of 1.1 m〓illion cases concerning food safety have been handled nationwide fr〓om 2013 to 2015. Violators will receive severe 9

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