2011 Annual Report 1a.Objectives (from AD-416) The overall objective of this cooperative research project is to conduct research on the relationship among yield, drainage water quality, and anhydrous ammonia application timing. 1b.Approach (from AD-416) Observations will be collected from subplots located over individual tile drains within a production field to obtain data on yield and water quality response to management. Extensive observations will be made on the relationships between yield, crop growth, drain water quality, and fertilizer application timing. 3.Progress Report Research being conducted under this cooperative agreement directly supports Objective 1: “Evaluate the impact of water table management on nitrate losses and crop yield in subsurface drained agricultural fields” of the parent project, and provides data on yield and grain variation as a function of soil properties, crop management, and nitrogen fertilizer rates and timing. Agriculture Research Service (ARS) personnel collected plant, soil, and water samples from replicated management zones and transects across the field in 2010-11. Monitoring of agreement progress and success during the past year has been primarily through several telephone contacts between the investigator and collaborator, more than 20 field site visits by ARS personnel, and delivery of electronic formatted data by the collaborator.