AbstractGas‐chromatographic analyses of extracts of soil samples from plots, treated with a 50 atrazine wettable powder at dose rates of 2 and 4 kg a.i. ha−1, showed the presence of a new atrazine degradation product. This product was isolated, concentrated and purified by column chromatography and high‐performance liquid chromatography. The chromatographic properties of this material were identical with those of a product isolated from a 0.02 methanolic solution of 2‐amino‐4‐chloro‐6‐isopropyl‐amino‐1,3,5‐triazine that had been stored under laboratory conditions. A combined gas‐liquid chromatographic/mass spectrometric assay identified the new product in soil as 2‐isopropylamino‐4‐methoxy
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