Page Banner

United States Department of Agriculture

Agricultural Research Service

Related Topics

Download a high-resolution (300dpi) digital image

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

Last Modified: 8/12/2016
Footer Content Back to Top of Page