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Image Number K206-6 At the Pioneering Research Laboratory for Plant Physiology in Beltsville, Maryland, botanist Harry A. Borthwick led early ARS studies on the effects of lights on plants from 1936 until the mid-1960s. Here, in this 1962 study, Borthwick irradiates cockleburs to control flowering.   640 pixels wide: (k206-6.jpg)   Please visit our Image Gallery


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