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Clipping and Regrowth of Barnyardgrass¹

Three field experiments were conducted to study the regrowth of barnyardgrass (Echinochloa crusgalli (L.) Beauv.) after clipping. Yields were decreased by cutting at more frequent intervals and less mature stages of top growth. The lowest yields were obtained by continuous clipping at vegetative stage of growth before internods elongation. At the vegetative stage of growth, higher clipped plants had faster regrowth and resulted in the production of more clippings and slightly higher total yields. Plants intensively clipped and liberally fertilized with nitrogen produced higher yields at first cuttings only. Fertilization with nitrogen decreased fructosan content in the stubble. After clippings, barnyardgrass regrew until killing frost.

² Associate Professor, Graduate Assistant and Laboratory Technician, respectively, Department of Plant and Soil Sciences.

Received for publication February 4, 1966.