As the optimum discharge which is needed for the agricultural chemical active ingredient which as for purpose of this invention it is possible, is combined to manufacture with simple method, is controlled, it is to offer the granular agricultural chemical formulation which shows the medicinal effect where it decreases environmental load, lightens the chemical injury which is pulled up by the agricultural chemical active ingredient stabilizes. It consists of with non collapse type agricultural chemical granular ones and the agricultural chemical active ingredient which do not collapse at underwater in the acidic agricultural chemical active ingredient and the cationic surface active agent and within 30 minutes which contain the basic substance, grain size 0.3 - 3mm or breadth 0.6 - 3mm, it is the grain size length 2 - 10mm, in the water surface it sinks to underwater after the applying, it makes the granular agricultural chemical formulation which possesses the character which at the same time within 30 minutes collapses at underwater.本発明の目的は簡便な方法で調製することができ、配合される農薬活性成分に必要とされる最適な放出制御をするとともに、環境負荷を低減し、農薬活性成分により引き起こされる薬害を軽減し、安定した薬効を示す粒状農薬製剤を提供することである。酸性農薬活性成分とカチオン界面活性剤と塩基性物質とを含有する30分以内には水中で崩壊しない非崩壊型農薬粒状物と、農薬活性成分とからなり、粒径0.3~3mm又は短径0.6~3mm、長径2~10mmの粒度であり、水面に施用後に水中に沈降し、かつ30分以内に水中で崩壊する性質を有する粒状農薬製剤とする。
