What form of nitrogen are most plants able to absorb? How does it get into that form?

Answer 1

Nitrogen fixing bacteria make nitrogen available as NO3 (nitrate) in soils. Nitrate is very soluble in water and is taken up by the plant. It can also get into the soil when lightning fixes nitrogen in the air, it then dissolves in the rain and goes into the soil then into the plants. Some plants can absorb nitrogen in this form through their leaves.

Again check out the nitrogen cycle

http://www.physicalgeography.net/fundamentals/9s.html

Answer 2

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Answer 3

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You are looking for this.
http://en.wikipedia.org/wiki/Nitrogen_cycle