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Artificial sun gives salad its colour back

作者:宫臊    发布时间:2019-03-08 04:08:02    

UNHEALTHILY pale lettuce can make even the best salads look wan and unsavoury. But a couple of days under weak ultraviolet light before you pick it can make the lettuce more palatable. Tests at a US Department of Agriculture (USDA) lab in Maryland show that an LED radiating just a few milliwatts in the UV-B band stimulates red-leaf lettuce to make the antioxidants that give it its characteristic colouring. Growing crops in greenhouses, done to supply fresh greens all year round,

 

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