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Response of Alfalfa, Green Onion, Dry Bulb Onion, Sugar Beet, Head Lettuce, and Carrot to Imazosulfuron Soil Residues 2 Years after Application

Published online by Cambridge University Press:  20 January 2017

Joel Felix ,
Steven A. Fennimore  and
John S. Rachuy
Joel Felix*
Affiliation:
Oregon State University/Malheur Experiment Station, 595 Onion Ave, Ontario, OR, 97914
Steven A. Fennimore
Affiliation:
University of California, Davis, Salinas, CA, 93905
John S. Rachuy
Affiliation:
University of California, Davis, Salinas, CA 93905
*
Corresponding author's E-mail: [email protected]
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Abstract

Field studies were conducted from 2009 to 2011 in Oregon and from 2006 to 2008 in California to evaluate the response of various crops to imazosulfuron soil residues 91 to 731 d after application (DAA). Imazosulfuron rates applied in Oregon were 224 or 450 g ai ha−1 PRE, sequential 224 g ha−1 PRE and POST, or 450 g ha−1 as a tank mixture with PRE applied S-metolachlor at 1,060 g ai ha−1 followed by 224 g ha−1 POST to potato. Imazosulfuron was applied on bare ground PRE at 224, 336, and 450 g ha−1 and applied sequentially at 450 g ha−1 in California. Sugar beet planted 91 to 364 and 458 to 731 DAA were injured 83 to 94% and 54 to 78% among imazosulfuron rates and application timing in 2007 and 2008, respectively. Alfalfa planted 701 DAA at rates greater than 224 g ha−1 was injured, and the forage yield was reduced. Onion, spinach, carrot, and broccoli were also injured by imazosulfuron residues when planted 91 to 731 DAA, regardless of the rate or interval before planting. Imazosulfuron applied at 224 to 450 g ha−1 458 to 731 d before planting head lettuce resulted in moderate injury that did not reduce fresh-weight yield. The results indicated that imazosulfuron residues in the soil have the potential to injure many rotational specialty crops for 2 yr or more in soils with pH > 6.9.

Se realizaron estudios de campo de 2009 a 2011 en Oregon y de 2006 a 2008 en California para evaluar la respuesta de varios cultivos a residuos en el suelo de imazosulfuron a 91 y 731 d después de la aplicación (DAA). En Oregon, las dosis de imazosulfuron aplicadas a la papa fueron 224 ó 450 g ai ha−1 PRE, aplicaciones secuenciales de 224 g ha−1 PRE y POST, o 450 g ha−1 en mezcla en tanque con S-metolachlor a 1060 g ai ha−1 PRE seguido de 224 g ha−1 POST. En California, imazosulfuron se aplicó PRE sobre suelo desnudo a 224, 336 y 450 g ha−1 y secuencialmente a 450 g ha−1. La remolacha azucarera sembrada 91 a 364 y 458 a 731 DAA fue dañada 83 a 94% y 54 a 78% en las diferentes dosis y momentos de aplicación de imazosulfuron en 2007 y 2008, respectivamente. Alfalfa sembrada 701 DAA a dosis mayores a 224 g ha−1 sufrió daño y el rendimiento del forraje se redujo. Cebolla, espinaca, zanahoria y brócoli también sufrieron daños debido a los residuos de imazosulfuron, cuando se sembraron 91 a 731 DAA, independientemente de la dosis o intervalo de tiempo antes de la siembra. Imazosulfuron aplicado de 224 a 450 g ha−1, 458 a 731 d antes de la siembra de lechuga, resultó en daño moderado que no redujo el rendimiento de peso fresco. Los resultados indicaron que los residuos de imazosulfuron en el suelo tienen el potencial de dañar muchos cultivos rotacionales de vegetales por 2 años o más en suelos con pH >6.9.

Keywords

EPTCimazosulfuronrimsulfuronS-metolachloralfalfa, Medicago sativa L.broccoli, Brassica oleracea L. var. botrytis L. ‘Marathon'carrot, Daucus carota L. ‘Bolero F'dry bulb onion, Allium cepa L. ‘Vaquero'green onion, Allium cepa L. cv. ‘1200′head lettuce, Lactuca sativa L. ‘Sniper'potato, Solanum tuberosum L. ‘Ranger Russet'spinach, Spinacia oleracea L. ‘Whale'sugar beet, Beta vulgaris L. ‘HM91122RR' and ‘B4430R'Crop rotationherbicide soil carryoverplant backsoil residuesvegetables
Type
Weed Management—Other Crops/AREAS
Information
Weed Technology , Volume 26 , Issue 4 , December 2012 , pp. 769 - 776
Copyright
Copyright © Weed Science Society of America 

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