ABSTRACT
The rates of application and the optimum time for treatment also vary with soil, rainfall, and the weed species to be controlled. The rest of the area to the right-of-way fence is similar to roadsides. If control is effected during the first 2 years by heavy rates of application, it can be maintained then with reduced rates. Vegetation that encroaches upon the edges of concrete or asphalt pavement or grows up through cracks and holes causes premature breakdown of the pavement. Control with presurface and postsurface applications of herbicides is possible. Noncropland control of woody plants — trees and shrubs — is quite important for general purpose activity. When trees and brush have become rather large, special control measures are necessary. The wide range of herbicide persistence in soil is mainly related to their susceptibility to chemical decomposition. One of the factors contributing to their destruction is the action of soil microorganisms.
