. Cyclopedia of farm crops. Farm produce; Agriculture. CHEMICAL WEED-KILLERS OR HERBICIDES 117 is to be sprayed or sprinkled broadcast on the foli- age or ground, it should be diluted with 15 to 30 parts of water, and this mixture agitated fre- quently during use. Sulfuric acid (oil of vitriol).—This, of course, is. Fig. 168. Poison hemlock {Oonium maculatum). destructive to everything it touches. It can be applied in the crown or about the roots of coarse or especially hardy plants, provided the user is willing to kill the adjacent vegetation, also. In general, carbolic acid will be preferred
. Cyclopedia of farm crops. Farm produce; Agriculture. CHEMICAL WEED-KILLERS OR HERBICIDES 117 is to be sprayed or sprinkled broadcast on the foli- age or ground, it should be diluted with 15 to 30 parts of water, and this mixture agitated fre- quently during use. Sulfuric acid (oil of vitriol).—This, of course, is. Fig. 168. Poison hemlock {Oonium maculatum). destructive to everything it touches. It can be applied in the crown or about the roots of coarse or especially hardy plants, provided the user is willing to kill the adjacent vegetation, also. In general, carbolic acid will be preferred, partly be- cause sulfuric acid can be handled only in glass vessels. Caustic soda.—A strong solution of this makes a cheap and effective-herbicide, commended especially for pouring on soil where it is desired to destroy poison ivy or other deep-rooted or woody plants. Of course, soil so treated will be rendered sterile for some time, but the soda will gradually leach away. Like salt, this is most effective if applied in hot, dry weather. Arsenical compounds.—One or another of the soluble arsenical compounds form the most effec- tive herbicides known. These form the basis of all or nearly all of the various proprietary "herbi- cides" or "; Such compounds are handled by leading horticultural supply houses, and, so far as the writer has tested them, are highly efficient. The only reason for seeking elsewhere is their high price. Soluble arsenical poisons as a rule can be bought considerably cheaper in the drug trade and are similar in action. The simplest to employ is arsenate of soda. This needs only to be dissolved in water for use, at the rate of 1 pound in 3 to 9 gallons of water. White arsenic is still cheaper, but according to Schutt's formula, which the writer has used, it must be combined with sal soda, which is somewhat both- ersome. (White arsenic, 1 pound; washing soda, 2 pounds; water, 3 to 9 gallons.) An important characteristi
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