PROBLEM TO BE SOLVED: To provide a seedling raising method capable of preventing root wrapping in seedling raising, and suppressing enlargement of a root part in soil, and a seedling raising box used for raising seedling.SOLUTION: A lower opening part 2b is formed on a lower side of a seedling raising container 2 forming a seedling tray 1, a root part Na of a seedling N inserted into culture soil 4 put into the seedling raising container 2 can extend downward relative to lower sides of the seedling raising container 2 and the culture soil 4, and a vertical length of the seedling raising container 2 is twice or greater than a length of one side of an upper opening part 2a of the seedling raising container 2, and the culture soil 4 is formed by mixing fiber materials to sand, and the seedling raising container 2 is configured so that, a bottom part of put culture soil 4 is accumulated above the lower opening part 2b.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2020,JPO&INPIT【課題】育苗中の根巻きの発生を防止すると共に、培土中では根部の肥大化が発生しにくい苗の育苗方法、及び苗の生育に用いる育苗箱を提供する。【解決手段】苗トレイ１を構成する育苗容器２の下部側に下側開口部２ｂを形成し、育苗容器２の内部に投入する培土４に挿し込んだ苗Ｎの根部Ｎａが、育苗容器２及び培土４の下部側よりも下方にまで伸長可能に構成し、育苗容器２の上下長さは、育苗容器２の上側開口部２ａの一辺の長さの二倍以上とし、培土４は、土砂に繊維材を混ぜて構成し、育苗容器２は、投入された培土４の底部が下側開口部２ｂよりも上方で溜まる構成とする。【選択図】図３
