. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. CHEMICAL WEED-KILLERS OR HERBICIDES 115 CHEMICAL WEED-KILLERS OR HERBICIDES By L. R. Jones The use of chemicals as herbicides offers no spe- cific cure-all ajjainst weeds. Cultivation, short rotations, watchfulness against the introduction and scattering of weed seeds, are all of more fun- damental importance than chemicals in combating weeds. There are, however, various cases
. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. CHEMICAL WEED-KILLERS OR HERBICIDES 115 CHEMICAL WEED-KILLERS OR HERBICIDES By L. R. Jones The use of chemicals as herbicides offers no spe- cific cure-all ajjainst weeds. Cultivation, short rotations, watchfulness against the introduction and scattering of weed seeds, are all of more fun- damental importance than chemicals in combating weeds. There are, however, various cases in which chemicals intelligently used are more expeditious and economical than any other means for weed- killing. A practical difficulty is so to use the her- bicide as to kill the obnoxious plants without working permanent injury to the soil or to neighboring cultivated plants. This difficulty limits the chief usefulness of chemicals as weed-killers to the following cases: (1) When an especially obnoxious weed, as poison ivy, occurs in a limited locality and is to be destroyed regardless of consequences to soil or neighboring plants. (2) When the aim is to render the soil permanently sterile, as in roadways, tennis courts, and the like. (3) When the weed plant, as orange hawk- weed and mustard, is much more sensitive than the associated useful plants to the action of some herbicide. and arsenical poisons more effective. Its chief value is against charlock, as noted on page 117. Kerosene.—This and other coal-oil products will kill plants. Because of handiness it is frequently used, but it is weak in efficiency, and relatively more costly than any other chemical here listed. A pint of crude carbolic acid will do better service than two gallons of kerosene, and costs much less. When crude petroleum is available at very low price it is commended. Carbolic acid.—This is one of the quickest and most valuable herbicides. The crude acid is rela- tively cheap. It is not quite equal
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