[Problem] To provide a tool and a method for raising seedlings and planting, by which long-root seedlings are raised using collecting-type raising seedling tools, the raising seedling tools are collected after the long-root seedlings are planted into drilled holes with no broken hole walls, and the plant root systems are allowed to grow vertically downward. To provide, in particular, a raising seedling tool for long-root seedlings having the following effects: (1) Long-root seedlings that are raised with straight roots without balling and can reach a stable soil layer are obtained. (2) Transportation and planting are facilitated and damaging root systems upon handling is prevented. (3) The raising seedling tools can be collected after planting. [Solution] To provide a raising seedling tool for long-root seedlings, comprising an assembly of divided pipes in which the divided pipes, which are obtained by cutting or dividing in a longitudinal direction into two pieces a cylindrical opening pipe that is made of a synthetic resin or a metal with a length of at least 50 cm and an inside-diameter aspect ratio of at least 5 and which have divided surfaces forming a two-dimensionally-flat plane, are assembled such that divided surfaces of both of the divided pipes face each other.Le problème décrit par la présente invention est de fournir un outil et un procédé d'élévation de plantules et de plantation, grâce auxquels des plantules à longues racines sont soulevées à l'aide d'outils d'élévation de plantules à collecte, les outils d'élévation de plantules étant collectés après que les plantules à longues racines sont plantées dans des trous percés sans parois à trous brisées, et les systèmes racinaires des plantes sont laissés à croître verticalement vers le bas. Afin de fournir, en particulier, un outil d'élévation de plantules pour les plantules à longues racines ayant les effets suivants : (1) Des plantules à longues racines qui sont soulevées avec des racines droites sans
