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Nitrogen Influences Bispyribac-Sodium Efficacy and Metabolism in Annual Bluegrass (Poa annua) and Creeping Bentgrass (Agrostis stolonifera)

Published online by Cambridge University Press:  20 January 2017

Patrick E. McCullough ,
Stephen E. Hart ,
Thomas Gianfagna  and
Fabio Chaves
Patrick E. McCullough*
Affiliation:
Department of Crop and Soil Science, University of Georgia, Griffin, GA 30223
Stephen E. Hart
Affiliation:
Department of Plant Biology and Pathology, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901
Thomas Gianfagna
Affiliation:
Department of Plant Biology and Pathology, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901
Fabio Chaves
Affiliation:
Department of Plant Biology and Pathology, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901
*
Corresponding author's E-mail: pmccull@uga.edu
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Abstract

Field and laboratory experiments were conducted in New Jersey to investigate the influence of nitrogen on annual bluegrass and creeping bentgrass metabolism and responses to bispyribac-sodium. In field experiments, withholding nitrogen during the test period increased sensitivity of both grasses to bispyribac-sodium, and grasses fertilized biweekly had darker color on most rating dates. Nitrogen generally increased annual bluegrass tolerance to bispyribac-sodium at 74 g ha−1 but not at 148 g ha−1. Creeping bentgrass was influenced by nitrogen at both herbicide rates. In laboratory experiments, weekly nitrogen treatments increased 14C-bispyribac-sodium metabolism in both grasses compared to unfertilized plants. Annual bluegrass metabolized approximately 50% less herbicide regardless of nitrogen regime compared to creeping bentgrass. Overall, routine nitrogen fertilization appears to improve annual bluegrass and creeping bentgrass tolerance to bispyribac-sodium, which may be attributed to higher metabolism.

En New Jersey se llevaron a cabo experimentos de campo y de laboratorio para investigar la influencia del nitrógeno en el metabolismo y las respuestas al bispyribac-sodium en Poa annua y Agrostis stolonifera. En los experimentos de campo, el no proporcionar nitrógeno durante el período de estudio incrementó la sensibilidad de ambos céspedes al bispyribac-sodium, mientras que los céspedes fertilizados cada dos semanas, tuvieron un color más oscuro en la mayoría de las fechas de evaluación. El nitrógeno generalmente incrementó la tolerancia de P. annua al bispyribac-sodium a74 g ha−1, pero no a 148 g ha−1, mientras que A. stolonifera fue influenciada por el nitrógeno a ambas dosis del herbicida. En los experimentos de laboratorio, los tratamientos semanales de nitrógeno incrementaron el metabolismo de 14C-bispyribac-sodium en ambos céspedes, comparados con plantas sin fertilizar. P. annua metabolizó aproximadamente 50% menos herbicida en comparación a A. stolonifera independientemente del suministro de nitrógeno. En general, la fertilización rutinaria con nitrógeno parece mejorar la tolerancia de P. annua y A. stolonifera al bispyribac-soidum lo que puede atribuirse a un mayor metabolismo.

Keywords

Bispyribac-sodiumannual bluegrass, Poa annua L.creeping bentgrass, Agrostis stolonifera L., ‘L-93’Efficacymetabolismnitrogenturf grass
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 25 , Issue 3 , September 2011 , pp. 385 - 390
Copyright
Copyright © Weed Science Society of America 

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