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The shorter you mow, the less the roots will grow.
Only about 5% of turf grass nutrition is derived from the soil; the other 95% is taken in through the blades as carbon, hydrogen, oxygen. Grass blades exist to convert energy from sunlight into sugars, starches and plant fibers that the grass plant then uses for growth. The food manufactured in the blades of the grass is used for both the top growth and the root growth. When you mow you reduce the ability of the grass plant to manufacture food, and thereby to form strong roots.