of these herbicides with 2,4,5- T, 2,4-D, dalapon, or TCA and fortifying agents such as 

 the herbicidal oils, the dinitro compounds, and pentachlorophenol may be used for the 

 control of vegetation on railroad rights-of-way, industrial sites, and in other nonculti- 

 vated areas. Use the higher rates of application if semipermanent soil sterilization is 

 required and the lower rates if contact kill or temporary soil sterilization is the ob- 

 jective. The treatments suggested above will render most soils unproductive for 

 periods of 30 days to 4 years or more depending on the chemical used, the soil type, 

 and a number of soil properties and climatic factors. 



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