. Principles of agricultural chemistry [microform] . found in plants, in minute quantities. elements are essential or useful to plants are made by growing plants in pure water, to which the salts to be tested are added. This is known as the water culture method, and is used because it is comparatively easy to secure pure water and salts, but almost impossible to secure a sand or soil from which plants do not ex- ^ Jahresber. Agr. Chem., 1864, pp. 94, 99, 159; 1S66, p. 121. Exp. 3, p. 717; 7, p. 643. 12 PRINCIPLES OF AGRICULTURAL CHEMISTRY tract some substance. Only the fourteen elem
. Principles of agricultural chemistry [microform] . found in plants, in minute quantities. elements are essential or useful to plants are made by growing plants in pure water, to which the salts to be tested are added. This is known as the water culture method, and is used because it is comparatively easy to secure pure water and salts, but almost impossible to secure a sand or soil from which plants do not ex- ^ Jahresber. Agr. Chem., 1864, pp. 94, 99, 159; 1S66, p. 121. Exp. 3, p. 717; 7, p. 643. 12 PRINCIPLES OF AGRICULTURAL CHEMISTRY tract some substance. Only the fourteen elements invariablyfound in plants need be considered, and as two of these (hydrogenand oxygen) are in the water, and one (carbon) is supplied fromthe air, there remains eleven to be tested. Twelve solutions areprepared. One contains all eleven elements, and is used as acheck. If the plant does not thrive in it, something is wrongwith the experiment. Each of the other solutions contain saltsof ten elements, one being left out of each solution. For ex-principlesofagri00infrap. 41
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