2. Materials and methods
The triazine herbicides used in this study were atrazine (2-chloro-4-ethylamino-6-isopropylamine-s-triazine), ametryn (2-(ethylamino)-4-(isopropylamino)-6-(methylthio)-s-triazine) and prometon (2,4-bis(isopropylamino)-6-methoxy-s-triazine). All herbicides (98% purity) were kindly supplied by Agan Chemical Manufacturers Ltd. (Ashdod, Israel); NaN3 (>99%) was purchased from Merck