Abstract: A photosynthetic culture system has a culture bath holding an fluid containing plant microorganisms, carbon dioxide supplying means for supplying carbon dioxide to the fluid in the culture bath, light-conducting plate in the form of a flat plate placed oppositely to a light-receiving culture surface existing on the side of said culture bath, and light-receiving panel mounted on the upper end surface of the light-conducting plate. Further said light-conducting plate has the function of turning incident light from said light-receiving panel by right angles to conduct the light uniformly to said light-receiving culture surface of said culture bath.

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.