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 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 a top position.

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.

Abstract: A purpose of the present invention is to provide a plant cultivation method with which the growth of plants can be promoted by adjusting the environment within a culture medium, and to provide a plant cultivation container with which this cultivation method can be easily and effectively performed. The present invention provides a plant cultivation method for plants which are raised in a culture medium, which cultivation method is characterized in that water is only supplied to the plants from the side of the culture medium, and provides a plant cultivation container and a plant cultivation device used therefor.

Abstract: A grafting method for uniting a scion to a stock includes forming conical projection on either a lower portion of a scion or an upper portion of a stock, forming a conical recess on either a lower portion of a scion or an upper portion of a stock, and joining the conical projection in the conical recess to unite the scion to the stock. A grafting apparatus includes a holder for holding either a scion or a stock, a die member having a conical hole into which either a scion or a stock is inserted, a cutting blade member arranged and movable along a generatrix of the conical hole, a ultrasonic drive device for moving the cutting blade member upward and downward at a ultrasonic high speed, a rotating drive device for rendering a relative rotation between the holder and the cutting blade member, and an elevating drive device for rendering a relative movement between the holder and the die member.

Abstract: A grafting method for uniting a scion to a stock includes forming a conical projection on either a lower portion of a scion or an upper portion of a stock, forming a conical recess on either a lower portion of a scion or an upper portion of a stock, and joining the conical projection in the conical recess to unite the scion to the stock. A grafting apparatus includes a holder for holding either a scion or a stock, a die member having a conical hole into which either a scion or a stock is inserted, a cutting blade member arranged and movable along a generatrix of the conical hole, a ultrasonic drive device for moving the cutting blade member upward and downward at a ultrasonic high speed, a rotating drive device for rendering a relative rotation between the holder and the cutting blade member, and an elevating drive device for rendering a relative movement between the holder and the die member.