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