The water miscibile polar solvent, the water insoluble agricultural chemical of 1 kinds or more which are melted in N- methyl pyrolidone desirably (usually 0.5 - 50%w/v) with the lignin (appropriately the lignin of the 1:10 - the 1:1: Weight ratio of the agricultural chemical) with including, the concentrated agricultural chemical solution which becomes is offered. This solution although the dissolved concentrate of retention stability of the sutorobirurin bactericide of a certain kind is offered, especially is useful.水混和性極性溶媒、好ましくはN-メチルピロリドン中に溶解された1種以上の水不溶解性農薬(通常は0.5~50%w/v)とリグニン(適切には1:10~1:1のリグニン:農薬の重量比)とを含んでなる濃縮農薬溶液が提供される。この溶液はある種のストロビルリン系殺菌剤の保存安定性の溶解性濃縮物を提供するのに特に有用である。
