Abstract
Experiments were conducted to determine14C absorption and translocation by oat (Avena sativaL. ‘Lyon’) foliarly treated with14C-sethoxydim {(2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one)} and various additives. Safflower (Carthamus tinctoriusL.), soybean [Glycine max(L.) Merr.], linseed (Linum usitatissimumL.), and sunflower (Helianthus annuusL.) oil all similarly increased foliar absorption and translocation of14C more than palm oil (Elaeis quineensisJacq.) but less than petroleum oil, when applied without an emulsifier. An emulsifier in the oil additive tended to enhance14C absorption and translocation more in soybean oil than petroleum oil so that14C absorption and translocation were similar with both oils containing emulsifiers. Absorption and translocation of14C tended to increase more with an increase in emulsifier concentration in soybean oil than in petroleum oil but not beyond 15% with either oil. Percentage of14C absorbed and translocated from14C-sethoxydim applied to oats increased as the amount of soybean oil applied increased from 2.3 to 4.6 L/ha, but the increase was less for sethoxydim at 0.87 kg ai/ha than at 0.03 or 0.17 kg ai/ha.
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