Atrazine Use in Field Corn<BR> Since 1958  <BR> foundation  <BR> inexpensive <BR> excellent crop tolerance <BR> PPI, PRE, POST (12) <BR> broad-spectrum <BR> up to 2.5 lb ai/A/year <BR> easily tank-mixed <BR> weak on T. panicum <BR> does not last full season in SE <BR> Rainfall <BR> soil type <BR>Enhanced degradation<BR>