Soil Fertilizer  - When the 17-year-locusts emerge, they bring a lot of nitrogen to the soil surface. When they die, their bodies fertilize the soil.  See "essential elements" and "fertilizer".  Gypsy moth, when they die, they fertilize.  Lightning is another way nature fertilizes.  Coarse woody debris provide essential elements of a long stable period of time.  In fact they are essential element storehouses.  A bag of fertilizer, most likely does not contain anything near the 17 essential elements.  It is sad when people apply ammonium nitrate only, and claim to be fertilizing or even worse yet, claiming to be feeding.  See "essential elements" and "fertilizers".

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