PROBLEM TO BE SOLVED: To effectively retain moisture inside a container for a long period of time by effectively catching moisture such as rainwater with a lid and suppressing introduction of moisture more than necessary, and effective for soil outside the container. Provide a soil improvement container that stably supplies components for a long period of time, balances water capture and air permeability by a lid, and supplies active components into the soil for a long period of time. SOLUTION: A container having air permeability is filled with a soil improving agent and embedded in soil. The container has a vertically long tubular body 4 having air permeability, and a lid 5 provided at an upper end portion of the body, and the lid includes a tubular peripheral wall portion 10 connected to the body, and a peripheral wall. End plate part 11 for closing the end part of the portion, and the outer surface of the end plate part is provided with rain water etc. introduction means and rain water etc. introduction adjustment means by rain water etc. introduction suppression means or air introduction means, and the body has a predetermined An opening means having an opening ratio of is provided. [Selection diagram] Fig. 1【課題】雨水等の水分が、蓋体で効率良く捕えられると共に、必要以上の水分の導入を抑制することで、容器の内部の環境を長期的に維持し、容器の外部の土壌中に対する有効成分の供給を長期にわたり安定的に行い、蓋体による捕水性と通気性のバランスを図り、長期にわたって有効成分を土壌中に供給する土壌改良容器の提供。【解決手段】通気性を有する容器に土壌改良剤を充填して土壌中に埋設する。容器は、通気性を有する筒状の縦長の胴体４と、胴体の上端部に設けられた蓋体５とを有し、蓋体は、胴体に接続される筒状の周壁部１０と、周壁部の端部を塞ぐ端板部１１とを有し、端板部の外面には雨水等導入手段と雨水等導入抑制手段による雨水等導入調整手段又は空気導入手段が設けられ、胴体には所定の開口率の開口手段が設けられる。【選択図】図１
