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Do Synergistic Relationships between Nitrogen and Water Influence the Ability of Corn to Use Nitrogen Derived from Fertilizer and Soil?

^a Post-doctorial fellow, USDA-ARS, North Central Soil Conservation Research Lab., 803 Iowa Ave., Morris, MN 56267
^b Plant Science Dep., South Dakota State Univ., Brookings, SD 57007
^c Agricultural and Biosystems Engineering Dep., South Dakota State Univ., Brookings, SD 57007

View larger version (9K): [in this window] [in a new window]   Fig. 1. An example of a line/plateau model that has been used for N fertilizer recommendations.

View larger version (13K): [in this window] [in a new window]   Fig. 2. The relationship between N rate and yields in the moderate (natural rainfall) and high (natural rainfall plus supplemental irrigation) water regime systems.

View larger version (23K): [in this window] [in a new window]   Fig. 3. A conceptual model explaining the observed synergistic relationships between N and water use efficiency. The model on the left represents the model used in many N recommendation models where a fixed amount of nitrate is assumed to be plant available, whereas the model on the right represents a system where the amount of N transported to the plant is a function of the amount of water transpired by the plant.