General questions on Integral Nitrogen

• 1.What is nitrogen?
• 2.Why is nitrogen so important?
• 3.What is reactive nitrogen (Nr)?

Questions on acceleration of the nitrogen cycle

• 4.How does crop production (and energy crops or biofuels) influence reactive nitrogen (Nr)?
• 5.Is nitrogen in surplus everywhere?
• 6.What are the problems associated with reactive nitrogen (Nr)?