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Now that ammonium nitrate has become so expensive and all but impossible to get, anyone who needs to apply nitrogen during hot weather should evaluate the alternatives.

As we write this in mid-2008, fertilizer prices have reached all-time highs. How did we get to these price levels and how does an agricultural producer make sound economic decisions in this environment?

I want to use this article to address commonly asked questions regarding the role of nitrogen, phosphorus and potassium in plants and outline the characteristics of their primary fertilizer sources.