They will decompose, releasing nitrogen back into the soil. Clippings do not lead to thatch buildup as once thought. If over one-half or more of the grass blade removed during mowing, most of the grass blades removed and the stems are exposed. This stresses the plant by initiating rapid regrowth of leaves and a drastic reduction of tree root system. A closer cut turf results in shorter roots that are susceptible to drying out during the heat and to disease.
Lawn mowers are of two basic types-rotary and reel.
A rotary mower cuts by knife action. The blade spins at about 90 miles per hour. Because it works on the knife principle, keep the blade sharp to do a good job. A dull blade will tear the grass rather than cut it and the leaf tips will have a whitish appearance. When sharpening the blade, turn the mower off and remove the spark plug wire so the machine can't start.