456 



Plant Physiology 



lawns, where it may be applied at the rate of from 3 to 6 

 pounds per square rod. Crude carbolic acid possesses an 



FIG. 131. Wheat in plat contiguous to that in Fig. 130, showing effect 

 of iron sulfate spray on ragweed. [Photograph by H. L. Bolley.] 



objectionable odor, but it is very effective in killing 

 vegetation in walks or courts. It may be sprayed upon 

 the ground at a strength of 1 quart of the acid to 5 gallons 



