Utilization of nitrogen by plants, David Rhodes, Purdue University

Ammonium Transport in Plants: EURATINE

Spreading Efficiency of Fertilizers

Ammonia Volatilization from Urea Fertilizers

Nitrogen Use Efficiency in Rice as Influenced by Different Straw Management Practices

Chemistry of Nitrogen

Topdressing N in Wheat

The Nitrogen Cycle

Nitrogen Management for Winter Wheat: Principles and Recommendations, M. M. Alley, Virginia Tech