作者: Harold Corey , Philip B. Knapp
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摘要: The present invention relates to an apparatus for dispensing plant nutriments a growing medium, such as soil, sand or the like, being effective transfer medium over protracted periods of time doses at rate which is function essentially solely amount water added each watering. Broadly stated, container preferably includes probe adapted be inserted sufficiently below surface prevent evaporation. sealed except aperture apertures in critical size, larger than capillary. characterized by its filled with hydrophilic gel, within gel there has been dissolved soluble nutriment component, saturation quantities. may contain inert dye signal exhaustion active products.