HerbicideMulch

 

Mowing is an important management tool in annual weed control to prevent weeds from generating seed. Mowing is also critical if the existing vegetation will create sufficient shade at the soil surface to kill off native seedlings or prevent native seed from germinating. If dense weeds develop, mow the plot at a height of 8 to 12 inches with a rotary mower when the weeds reach a height of two to three feet. It is important to use a rotary mower because of its shredding action. The vegetation cut by sickle type mowers could smother the seedlings of the prairie plants (McClain). Mowing can also be utilized to help control prescribed burning. For example, the Science II Prairie on the campus of Iowa State University was once mowed prior to an experimental burn to give the burn crew more control over the fire. No rain had fallen for several days and the prairie was in favorable dry condition. The mowing left a layer of dry mulched vegetation that was ideal for burning (ISU). 

 UIS Prairie Mowing Record

We began mowing the expansion section (70%) in 1996. This service was provided free of charge by the UIS Department Physical Operations and the local farmer that leases out university land for crops. Mowing the prairie site did not appear to damage existing native plants, in fact, the mowed plants grew in thicker and healthier. Mowing also trimmed the tall woody weeds and allowed for a more efficient burn.  
YEAR MONTH % Mowed
1996 August 70
1997 June 70
1997 August 70
1998 June 70
1999 June 70
2000 July 70

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