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to the〓 clean environment, plants can grow without antiseptics or pesticides, 〓"you can even eat it fresh out of the bag", Zheng added. In addition t〓o sanitation, scientists also take temperature, humidity, air circulati〓on, light, carbon dioxide, nutrients and other elements O

into account to〓 create the "perfect environment" for growth. A tightly controlled env〓ironment not only maximizes growth potential, but also allows scientist〓s to create food that suits specific needs, Zheng said. For example, s〓cientists can lower the amount of potassium from 7



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ters 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 q

create LED lights that shine at that specific intensity and s〓pectrum, saving lots of energy in the process," he added. While blue a〓nd red lights are the "meat and potatoesz

" of a plant's growth, scientis〓ts notice other spectrums of light also play a subtle role in maximizin〓g growth and quality. For example, scientists discovered that adding q

s〓ome green light to the red-blue recipe could help some vegetables grow,〓 while too much green light puts plants into hibernation, although this〓 is helpful for the plant'E


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s nutrient build up. "Mimicking sunlight usi〓ng LED is very energy intensive," Li said. "At the end of the 7

day, whoe〓ver has the most energy-efficient and productive light recipe wins." W〓hile plant growth mostly 8

relies on light, water and carbon dioxide, it 〓still needs some trace elements from soil or fertilizers to N

be healthy.〓 In the case of plant factories, hydroponic nutrient solutions infused 〓with 17 essential eleN

ments ranging from nitrogen to calcium have replac〓ed the tilted soil. "The content of the nutrient solutiD


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on is also tail〓ored to suit the plant's specific needs," said Pei Kequan, a research d〓irectoW

r at the factory. Unlike the trace elements from fertilizers, whi〓ch are locked in big compound7

molecules, "the nutrients in the solution〓 are broken into small molecules, meaning the plant Q

can absorb them eas〓ier and grow faster while keeping its nutrient value and taste". It ta〓keM

s about 20 days for a sapling to reach maturity in the lab, but 40 to〓 60 days in a conventionp

al farm. This means scientists can reap more th〓an a dozen harvests of produce each year, comp3


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ared 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 deplete〓d, scienh


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. "We go to great〓 length to study and cater to our plant's most fundamental nea

eds, 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) --d

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