Effects of Atrazine-Phytobland Oil Combinations on14CO2-Fixation and Transpiration

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Abstract
Fixation of14CO2in corn (Zea maysL. ‘VPI 646’ or ‘VPI648′) and transpiration in corn and soybean [Glycine max(L.) Mere. ‘Lee’] following treatment with atrazine [2-chloro-4-(ethylamino)-6-isopropylamine-s-triazine] were reduced by the addition of phytobland petroleum oils to the treatment solutions. Inhibition of14CO2fixation increased with increasing rates of oil and (or) atrazine and decreased with time following treatment. Oil type (naphthenic versus paraffinic) and viscosity (70, 100, 150, and 200 sec) did not significantly affect14CO2fixation or transpiration; however, when applied alone or in combination with atrazine, the 100-sec viscosity oils tended to be the most inhibitory.