{HEAD ~ Application} of outside forces, such as caused by tilling, rainstorms, irrigation, etc., insures {TAIL ~ complete breakdown} of these granules 
insures
{ HEAD ~ Application } of outside forces , such as caused by tilling , rainstorms , irrigation , etc . , insures { TAIL ~ complete breakdown } of these granules
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH