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The most practical and powerful tool for breathing life back into the soil is the same tool that sucked the life out of it: grazing. Overgrazing is grazing a plant before it has recovered from a previous grazing. It can reduce root growth by 90 percent and, because there is less root growth, the soil contains less organic matter, holds less moisture, becomes more compacted and drops in fertility. The result is increasing weeds and declining productivity. Most weeds don't make the land unhealthy.