Ammonium and Nitrate
Ammonium and nitrate are inorganic compounds that plants can absorb. Ammonium is a cation, or positively charged, while nitrate is an anion, or negatively charged (these electrical charges are a result of a gain or loss of electrons).
Since ammonium and nitrate have equal opposing charges, they can easily bond together to form an ionic compound called ammonium nitrate.
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