The present disclosure relates to casting cores. The teachings thereof may be embodied in methods for producing a slip and components produced using such methods. For example, a method for producing a slip may include: mixing at least one inorganic constituent with at least one binder, wherein the binder comprises at least one epoxy resin and at least one silicone copolymer.

The present invention provides a new and useful (i) plant root feeding device (ii) plant root feeding system, (iii) method of feeding a plant, and (iv) method of manufacturing a plant root feeding device. The plant root feeding device comprises a fluid container (emitter) formed of semi permeable material that allows fluid to pass from the inside of the container to a plant root located in ground in proximity to the fluid container. The fluid container has a fluid inlet opening, and a fluid inlet tube is in fluid communication with the fluid inlet opening of the fluid container. The fluid inlet tube has a fixed, fluid sealed coupling to the fluid inlet opening of the fluid container, and the fluid container has a configuration that enables it to be located in ground in proximity to an in ground root system of a plant, and a permeability that enables fluid to pass from the inside of the container to the in ground root system of a plant in proximity to the fluid container.