Evening Republican, Volume 20, Number 210, Rensselaer, Jasper County, 1 September 1916 — LIEBIG’S FOUR LAWS [ARTICLE]

LIEBIG’S FOUR LAWS

Announced by the Noted German Chemist Fifty Years Ago. 1. A soil can be termed fertile only when It contains all the materials necessary for the nutrition of plants, in the required quantity, in the proper form. 2. With every crop, a portion of these ingredients is removed. A part of this is again added from the inexhaustible store of the atmosphere; another part, however, is lost If not replaced by man. 3. The fertility of the soil remains unchanged if all the Ingredients of the crop are given back to the soil. Such a restitution is effected by manure and fertilizers. 4. The manure produced In the course of farming is not sufficient to maintain permanently the fertility of a farm; it lacks the constituents which are annually sold In the shape of grain, hay, milk, and live stock.