| "Ammonium" could refer to either ammonium nitrate or anhydrous ammonia. Anhydrous ammonia combines with water and other things in the soil to become ammonium ion. Ammonium is an positively charged ion that combines with negatively charged ions, such as nitrate or hydroxide ions. Anhydrous ammonia is a gas without charge. Lee Reich, PhD Books by Lee Reich: The Pruning Book Weedless Gardening Uncommon Fruits for Every Garden On Jan 16, 2007, at 10:14 PM, road's end farm wrote:
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