ABSTRACT
The ecological relationships among the biota and the abiotic factors of the ecological relationships among the biota represent an ecosystem of many different types of subclimax vegetation. Depending on the terrain and availability of labor in a region, weed control is generally less expensive with herbicides than with mechanical means. Agricultural practice in recent times has been characterized by the elimination of the smaller farms in order that the utilization of modern high-priced farm equipment might be more efficient. Major nonagricultural uses of herbicides include the management of vegetation on roadsides, rights-of-way, transmission lines, fire breaks, and parking areas. Brush, trees, and other vegetation may interfere with transmission lines, block views, hinder passage along roadways, or restrict other activities on rights-of-way. The elimination of some vegetation with herbicides may expose portions of the soil to runoff and soil erosion. Since many grasses cover the bare areas quickly, this condition lasts only a part of a season.
