| http://www.w3.org/ns/prov#value | - It will be evident that in such an application of the invention, the rate of feeding by the capillarywick will, because of the constant liquid level maintained, be very constant. being such that at the plant-controlled rate of 15 The system as practiced in each of the disclosed forms of apparatus involves the same principle, namely, feeding to the plant roots, at the rate of up-take by the root, a
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