Disclosed are compounds exhibiting sufficient herbicidal activity at low application dosage when they are applied to soils and foliage, and an agrochemical composition using the same, in particular herbicides. The compounds are triazine derivatives represented by following Formula 1 or salts thereof, and the herbicides containing them:wherein in the formula, R1 represents a hydrogen atom； a C1-C12 alkyl group； a C2-C6 alkenyl group, etc., R2 represents a C1-C12 alkyl group, etc., Y and Z represent an oxygen atom or a sulfur atom, and A represents a 5- or 6-membered cyclic group which may contain a nitrogen atom, an oxygen atom, or a sulfur atom.本發明揭示一種在低施用劑量下施用於土壤及葉部時具有充份除草活性之化合物，及使用該化合物之農化組成物，特別是除草劑。該化合物為下式1所示之三衍生物或其鹽，及含有該三衍生物或其鹽之除草劑：其中，於該式中，R1表示氫原子；C1-C12烷基；C2-C6烯基等，R2表示C1-C12烷基等，Y與Z表示氧原子或硫原子，及A表示可含有氮原子、氧原子或硫原子之5-或6-員環狀基團。
