Abstract: An irrigation device includes: a cell plug that includes an opening facing upward and an accommodation part that accommodates a predetermined amount of culture medium in communication with the opening; a liquid supply unit that supplies a liquid to a culture medium of the cell plug; and a cell plug lifting unit that lowers the cell plug when a weight of the cell plug is increased by a liquid supplied by the liquid supply unit and lifts the cell plug when a weight of the cell plug is decreased by drying of a culture medium. The liquid supply unit includes a contact end that is intermittently brought into contact with a culture medium by lifting and lowering of the cell plug by the cell plug lifting unit, performs liquid supply while the contact end is in contact with a culture medium, and stops liquid supply when the contact end is separated from a culture medium.

Abstract: An irrigation device includes: a cell plug that includes an opening facing upward and an accommodation part that accommodates a predetermined amount of culture medium in communication with the opening; a liquid supply unit that supplies a liquid to a culture medium of the cell plug; and a cell plug lifting unit that lowers the cell plug when a weight of the cell plug is increased by a liquid supplied by the liquid supply unit and lifts the cell plug when a weight of the cell plug is decreased by drying of a culture medium. The liquid supply unit includes a contact end that is intermittently brought into contact with a culture medium by lifting and lowering of the cell plug by the cell plug lifting unit, performs liquid supply while the contact end is in contact with a culture medium, and stops liquid supply when the contact end is separated from a culture medium.

Abstract: A seedling-cutting apparatus includes a pair of arms that is to nip a portion of a stem of a seedling for grafting and that can be opened and closed and a blade that is provided so as to be capable of reciprocating relative to the portion of the stem. At least one of the pair of arms includes a through hole or a cutout that penetrates a portion of the arms along a direction in which the blade reciprocates. At least a portion of the through hole or the cutout faces the portion of the stem and at least a portion of the blade moves through the through hole or the cutout.

Abstract: A seedling raising device includes: a cell plug for seedling raising that is formed as a single pot body; and a supporting device configured to detachably arrange and support a plurality of cell plugs, wherein the supporting device is capable of supporting the cell plug in either one of a first supporting position where the cell plug is slidably supported in a horizontal direction and a second supporting position where the cell plug is detachably supported in an upward direction.

Abstract: A seedling-cutting apparatus includes a pair of arms that is to nip a portion of a stem of a seedling for grafting and that can be opened and closed and a blade that is provided so as to be capable of reciprocating relative to the portion of the stem. At least one of the pair of arms includes a through hole or a cutout that penetrates a portion of the arms along a direction in which the blade reciprocates. At least a portion of the through hole or the cutout faces the portion of the stem and at least a portion of the blade moves through the through hole or the cutout.