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磺酰脲类除草剂是本世纪发现的超高效除草剂，用量在１０～６０ｇ／ｈｍ２，多者一般也不超过１００ｇ／ｈｍ２，假设这些药剂在表层５ｃｍ土层内，则其浓度约为２０～８０ｐｐｂ，若在表层１０ｃｍ土层内，则其浓度约为１０～４０ｐｐｂ，用量仅为１ｇ／ｈｍ２的磺酰脲类除草?
Sulfonylurea herbicides are the super-efficient herbicides discovered in this century. The dosage is 10 ~ 60g / hm2, usually not more than 100g / hm2. Suppose these agents have a concentration of about 20 in the top 5cm soil layer ~ 80ppb, if the surface layer within 10cm, then the concentration of about 10 ~ 40ppb, the amount of only 1g / hm2 sulfonylurea weeding?