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United States Department of Agriculture

Agricultural Research Service

ARS Photo Library

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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.



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Last Modified: 5/23/2006
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