Corteva Acquires Clearfield System for Canola in North America Feb 20, 2019 | Agrochemicals, News, Seeds Your subscription level does not currently cover this area of our services. Please contact us to find out how to gain access. Username or E-mail Password * Remember Me Forgot Password Tags: BASF, Canada, Canola, Clearfield, Corteva, imazamox, Imazapyr, North America, Product Acquisitions, USA