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Halosulfuron: Crop Tolerance, Weed Control and Species Sensitivity in Dry Beans

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dc.contributor.advisor Sikkema, Peter
dc.contributor.advisor Van Acker, Rene
dc.contributor.author Li, Zhenyi
dc.date.accessioned 2016-04-22T15:50:51Z
dc.date.available 2016-04-22T15:50:51Z
dc.date.copyright 2016-04
dc.date.created 2016-04-13
dc.date.issued 2016-04-22
dc.identifier.uri http://hdl.handle.net/10214/9601
dc.description.abstract Twelve field experiments were conducted over a two-year period (2013, 2014) to evaluate the tolerance of white bean to halosulfuron and spectrum of weeds controlled with halosulfuron applied alone and in combination with trifluralin, pendimethalin, EPTC, dimethenamid-P or S-metolachlor applied preplant incorporated (PPI) and pendimethalin, dimethenamid-P or S-metolachlor applied preemergence (PRE). At 1 and 4 weeks after emergence (WAE), halosulfuron applied PPI or PRE, applied alone or in combination with trifluralin, pendimethalin, EPTC, dimethenamid-P or S-metolachlor caused ≤ 3%. At 4 and 8 WAE, halosulfuron applied PPI or PRE provided ≥ 90% control of common lambsquarters, wild mustard, redroot pigweed and common ragweed and ≤ 60% control of green foxtail. Weed biomass and density data reflected the weed control ratings. White bean yield with halosulfuron applied in combination with trifluralin, pendimethalin, EPTC, dimethenamid-P or S-metolachlor was equivalent to the weed-free control. Halosulfuron absorption, translocation and metabolism were studied in white and adzuki bean. Halosulfuron was absorbed more rapidly in adzuki bean than white bean. Adzuki bean reached 90% absorption (t90) 26.2 hours after treatment (HAT), while white bean required 40.1 HAT to reach t90. The maximum halosulfuron absorption (Amax) was higher in adzuki bean (75.7%) than in white bean (65.3%). More 14C-halosulfuron was translocated to the apex, 1st trifoliate, stem above the treated leaf and roots in aduzki bean than in white bean. The maxiumum radioactivity translocated out of treated leaf (Tmax) was higher in adzuki bean (17.7%) than in white bean (12.1%). Halosulfuron was broken down to the same metabolites in white and adzuki bean. The half-life of halosulfuron in adzuki bean and white bean was 16 HAT and ≤ 6 HAT, respectively. Differential tolerance of white and adzuki bean to halosulfuron can be attributed to greater absorption, greater translocation and decreased metabolism in adzuki bean. en_US
dc.description.sponsorship Gowan Canada; Ontario Bean Growers en_US
dc.language.iso en en_US
dc.subject Halosulfuron en_US
dc.subject Weed management en_US
dc.subject Dry bean en_US
dc.subject radioactivity en_US
dc.subject Tankmix en_US
dc.title Halosulfuron: Crop Tolerance, Weed Control and Species Sensitivity in Dry Beans en_US
dc.type Thesis en_US
dc.degree.programme Plant Agriculture en_US
dc.degree.name Doctor of Philosophy en_US
dc.degree.department Department of Plant Agriculture en_US
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