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A changing climate coupled with rapidly increasing demand for agricultural products will offer challenges greater than any previously experienced by global agriculture. The changing above ground environment, including air temperature, precipitation and carbon dioxide concentrations, will impact crops directly as these factors impact plant physiologic processes. Less well recognized is that for world agricultural demands to be met, vast increases of nutrients and water must be supplied to cropfatcat:s5lheyqihjcvve6uuqrvnlpdju