Abstract: A continuous molding machine (10) for forming two chains (55) of soil plugs (50) for use in germinating seeds or otherwise growing plants. A continuous sheet of paper (22) is corrugated to conform to a series of mold elements (14) and a reaction mixture (32) of polymerizing agent and soil slurry is added over the paper to conform to the mold element shape. Another sheet of paper (38) is added over the top of the mixture (32) and the entire assembly is then passed under a series of pressure belts (42, 44, 46) during which time the mixture (32) is cured. The chain of soil plugs (50) which emerges from the pressure belts (42, 44, 46) is encased on both sides by paper (22, 38) and may be cut to provide a pair of separate soil plug chains (55).

Abstract: A method of forming a urethane prepolymer comprising the steps of gradually adding an isocyanate compound to a hydrophilic polyether or polyester compound without substantial added mixing whereby a relatively dense isocyanate layer and a polyether or polyester layer overlying the isocyanate layer are formed, and a urethane prepolymer-forming reaction occurs at the interface between the layers. The resulting urethane prepolymer may be reacted with water to form a cellular urethane polymer, or with an aqueous slurry of unconsolidated aggregate material to form a consolidated aggregate product, such as a plant growth supporting rooting medium.

Abstract: A method of forming a hydrophilic urethane prepolymer comprising the steps of reacting an isocyanate compound to a hydrophilic polyether or polyester compound which has been heated to such a temperature that the temperature of the reactants after addition of isocyanate is at least as high as about 120.degree. C. The resulting urethane prepolymer may be reacted with water to form a cellular urethane polymer.

Abstract: A field transplant system including a machine for sequentially forming groups of polymerized soil plugs having seed receiving recesses in one end thereof and supported on a carrier, and in certain cases interconnected by strips, the carrier being used to transport the soil plugs through a seeding station and then to a germination station and then to a growing station either in the flat or on a plant turning machine in a greenhouse to grow the germinated seeds to transplant size, and then using the carrier to transport the soil plugs with the transplants growing therein to the field for transplanting by an automatic transplanter; several forms of soil plugs are disclosed, and several methods for supplying seeds to the soil plugs are disclosed, as well as an improved method of mounting a mat of soil plugs on the cylinder of a plant turning machine.

Abstract: A rooting media in the form of a resilient, integral body of spongy open-celled hydrophilic polymer forming a first essentially continuous phase extending throughout the body and having passages therethrough forming a second essentially continuous phase extending throughout the body, a quantity of particles of soil mixture distributed throughout the body of spongy polymer and held thereby with a substantial portion of the surface area of the particles of soil mixture exposed and in communication with the passages, the exposed particles of soil mixture providing colloidal contact exchange surfaces in communication with the passages and having collectively a porosity maintenance capacity and a water holding capacity and an ion exchange capacity and a pH buffering capacity; also disclosed is a method of making such a body of rooting media, as well as a release agent useful in that method; there further is disclosed a particular form of rooting media for use in propagation by air layering and a method of propagat

Abstract: A field transplant system including a machine for sequentially forming groups of polymerized soil plugs having seed receiving recesses in one end thereof and supported on a carrier, and in certain cases interconnected by strips, the carrier being used to transport the soil plugs through a seeding station and then to a germination station and then to a growing station either in the flat or on a plant turning machine in a greenhouse to grow the germinated seeds to transplant size, and then using the carrier to transport the soil plugs with the transplants growing therein to the field for transplanting by an automatic transplanter; several forms of soil plugs are disclosed, and several methods for supplying seeds to the soil plugs are disclosed, as well as an improved method of mounting a mat of soil plugs on the cylinder of a plant turning machine.

Abstract: A field transplant system including a machine for sequentially forming groups of polymerized soil plugs having seed receiving recesses in one end thereof and supported on a carrier, and in certain cases interconnected by strips, the carrier being used to transport the soil plugs through a seeding station and then to a germination station and then to a growing station either in the flat or on a plant turning machine in a greenhouse to grow the germinated seeds to transplant size, and then using the carrier to transport the soil plugs with the transplants growing therein to the field for transplanting by an automatic transplanter; several forms of soil plugs are disclosed, and several methods for supplying seeds to the soil plugs are disclosed, as well as an improved method of mounting a mat of soil plugs on the cylinder of a plant turning machine.

Abstract: A rooting media in the form of a resilient, integral body of spongy open-celled hydrophilic polymer forming a first essentially continuous phase extending throughout the body and having passages therethrough forming a second essentially continuous phase extending throughout the body, a quantity of particles of soil mixture distributed throughout the body of spongy polymer and held thereby with a substantial portion of the surface area of the particles of soil mixture exposed and in communication with the passages, the exposed particles of soil mixture providing colloidal contact exchange surfaces in communication with the passages and having collectively a porosity maintenance capacity and a water holding capacity and an ion exchange capacity and a pH buffering capacity; also disclosed is a method of making such a body of rooting media, as well as a release agent useful in that method; there further is disclosed a particular form of rooting media for use in propagation by air layering and a method of propagat

Abstract: A rooting media in the form of a resilient, integral body of spongy open-celled hydrophilic polymer forming a first essentially continuous phase extending throughout the body and having passages therethrough forming a second essentially continuous phase extending throughout the body, a quantity of particles of soil mixture distributed throughout the body of spongy polymer and held thereby with a substantial portion of the surface area of the particles of soil mixture exposed and in communication with the passages, the exposed particles of soil mixture providing colloidal contact exchange surfaces in communication with the passages and having collectively a porosity maintenance capacity and a water holding capacity and an ion exchange capacity and a pH buffering capacity; also disclosed is a method of making such a body of rooting media, as well as a release agent useful in that method; there further is disclosed a particular form of rooting media for use in propagation by air layering and a method of propagat

Abstract: A field transplant system including a machine for sequentially forming groups of polymerized soil plugs having seed receiving recesses in one end thereof and supported on a carrier, and in certain cases interconnected by strips, the carrier being used to transport the soil plugs through a seeding station and then to a germination station and then to a growing station either in the flat or on a plant turning machine in a greenhouse to grow the germinated seeds to transplant size, and then using the carrier to transport the soil plugs with the transplants growing therein to the field for transplanting by an automatic transplanter; several forms of soil plugs are disclosed, and several methods for supplying seeds to the soil plugs are disclosed, as well as an improved method of mounting a mat of soil plugs on the cylinder of a plant turning machine.

Abstract: A container of stabilized media with a growing plant therein comprising a fluid-tight container open at the upper end, a body of soil mix in the container with a growing plant having the roots thereof in the body of soil mix and having the stalk thereof extending outwardly from the upper surface, and a quantity of synthetic organic plastic resin distributed throughout the body of soil mix and around the roots in an acetone solution, the resin being reacted in situ to form an open-celled hydrophilic polymer binding the body of soil mix into a cohesive mass and to the adjacent inner surfaces of the container and binding the roots in the cohesive mass, the roots being disposed substantially uniformly throughout the adjacent portions of the cohesive mass and the stalk being intimately surrounded by the cohesive mass and extending through the upper surface thereof; there also is disclosed a container wherein the growing plant is disposed in a soil plug that is stabilized by an open-celled hydrophilic polymer; ther

Abstract: A potted plant assembly including a container open at the upper end thereof, a body of material filling the container to a predetermined level, a quantity of foam-forming synthetic organic plastic resin distributed throughout the body of material, the quantity of resin being reacted in situ to form an open-celled hydrophilic polymer binding the body of material into a cohesive mass and to the adjacent inner surfaces of the container, a body of foam in the container extending from the predetermined level upwardly adjacent to the upper end of the container, the foam being an open-celled hydrophilic polymer of synthetic organic plastic resin and being secured to the upper surface of the cohesive mass and the adjacent inner surfaces of the container, and a growing plant having the roots thereof substantially uniformly disposed throughout the adjacent portions of the body of foam and the stalk thereof intimately surrounded by the body of foam and extending through the upper surface; also disclosed is a potted plan

Abstract: A polymerized soil plug with a growing plant molded therein comprising a body of spongy open-celled hydrophilic polymer, a growing plant having the roots thereof in the body of spongy polymer and having the stalk thereof extending outwardly from one surface, and a quantity of particles of soil mix distributed throughout the body of spongy polymer, a quantity of synthetic organic plastic resin being reacted in situ to form the body spongy open-celled hydrophilic polymer binding the particles of soil mix therein and into a plug and binding the roots in the plug, the soil mix comprising from about 20% to about 80% by dry weight of the soil plug, the roots being distributed substantially uniformly throughout the adjacent portions of the plug and the stalk being intimately surrounded by the plug; the method of making such a soil plug is also disclosed as well as a package for retail sale of the soil plugs with growing plants therein; also disclosed are hangers and a plaque for receiving the soil plugs.

Abstract: A plant growth accelerating apparatus for increasing plant yields by effectively removing the growing plants from the constraints of gravity and increasing the plant yield per unit of space when the light intensity incident on the apparatus varies, and including a plant bed mounted for turning about the longitudinal axis thereof and a drive structure for periodically tilting the longitudinal axis of the plant bed while relatively low light intensities are incident thereon to impart thereto a slope from about 0.01 to about 0.25 to decrease the respiration rate of plants growing on the plant bed; there also is disclosed a structure applying the tilting structure to a multiple plant bed machine, as well as gravitational watering structure for multiple plant beds while turning the same, and improved plant bed structures and novel forms and compositions of rooting media and methods of making the same.