Aminopyralid Residue Impacts on Potatoes and Weeds |
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Authors: | Steven S Seefeldt Rick A Boydston Phil N Kaspari Mingchu Zhang Erin Carr Jeff Smeenk David L Barnes |
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Institution: | 1. Cooperative Extension Service Tanana District, University of Alaska Fairbanks, Fairbanks, AK, 99775, USA 2. US Department of Agriculture—Agricultural Research Service, Irrigated Agriculture Research and Extension Center, Prosser, WA, 99350-9687, USA 3. Cooperative Extension Service Delta District, University of Alaska Fairbanks, Delta Junction, AK, 99737, USA 4. Department of High Latitude Agriculture, University of Alaska Fairbanks, Fairbanks, AK, 99775, USA 5. Palmer Soil and Water District, 259 South Alaska St, Palmer, AK, 99645, USA 6. Department of Civil and Environmental Engineering, University of Alaska Fairbanks, Fairbanks, AK, 99775-5900, USA
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Abstract: | Aminopyralid is used in Alaska to control certain invasive weed species; however it appears to have an extended soil half-life in interior Alaska resulting in carry-over injury in potatoes. Field studies at three experiment stations in Delta Junction, Fairbanks, and Palmer, Alaska were established to determine the dose–response of weeds and above and below ground potato growth to soil-applied aminopyralid (0, 8, 15, 31, 62, and 123 g ae ha?1) . Both prostrate knotweed and narrowleaf hawksbeard were susceptible to aminopyralid. At Delta Junction and Fairbanks, visual injury of potatoes greater than 25 % was observed at 15 g ae ha?1 aminopyralid, whereas at Palmer visual injury was greater than 40 % at 8 g ae ha?1, the lowest rate tested. Potato tuber production was reduced by aminopyralid at rates of 15 g ae ha?1 and above at both Delta Junction and Palmer. Sub-samples of potato tubers from Delta Junction and Palmer were analyzed for aminopyralid content and grown out to determine if aminopyralid in tubers would reduce subsequent growth. The aminopyralid concentration in potato tubers increased with increasing field application rates, with 30 ppb extracted from tubers grown at the highest application rate (123 g ae ha?1). All plants grown from daughter tubers except from control plots in Palmer exhibited injury symptoms. The number of emerged shoots, and shoot height decreased with increasing aminopyralid concentrations in the tuber, with injury rates greater than 70 % at 8 g ae ha?1. |
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