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Testing Soils and Cornstalks to Evaluate Nitrogen Management on the Watershed Scale

^a Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
^b Dep. of Plant and Soil Science, Univ. of Connecticut, Storrs, CT 06269

View larger version (30K): [in a new window]   Fig. 1. Relationships between early-season rainfall and (A) annual means for soil NO3–N concentrations measured in early June and (B) annual means of stalk NO3–N concentrations measured at the end of the season.

View larger version (28K): [in a new window]   Fig. 2. Mean monthly rainfall for the two wettest years (1991 and 1999), the two driest years (1988 and 1989), and 30-yr means for rainfall in Iowa.

View larger version (32K): [in a new window]   Fig. 3. Distributions of soil NO3–N concentrations in relatively wet and dry years.

View larger version (32K): [in a new window]   Fig. 4. Distributions of cornstalk NO3–N concentrations in relatively wet and dry years.

View larger version (24K): [in a new window]   Fig. 5. Relationship between annual means for soil NO3–N concentrations in early June and annual means for flow in the Des Moines and Iowa Rivers.

View larger version (25K): [in a new window]   Fig. 6. Relationship between early-season water flows in the Des Moines and Iowa Rivers and annual means of cornstalk NO3–N concentrations measured at the end of the season.

View larger version (29K): [in a new window]   Fig. 7. Relationships between annual mean NO3–N loads in the Iowa River at Wapello and annual means for (A) soil NO3–N concentrations in late spring and (B) cornstalk NO3–N concentrations at the end of the growing season.

View larger version (29K): [in a new window]   Fig. 8. Mean (A) soil and (B) cornstalk NO3–N concentrations for six rate-of-N-fertilization categories for soils with and without animal manure.