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Performance-Based Evaluations of Guidelines for Nitrogen Fertilizer Application after Animal Manure

^a Dep. of Plant and Soil Sci., Univ. of Delaware Res. and Educ. Cent., 16684 County Seat Hwy., Georgetown, DE 19947
^b Dep. of Agron., Iowa State Univ., Ames, IA 50011

View larger version (32K): [in a new window]   Fig. 1. Relationships between corn yield responses to fertilizer N applied at 100 kg ha–1 and concentrations of soil (A) NO3–N to a depth of 30 cm, (B) NO3–N to a depth of 60 cm, (C) exchangeable NH4–N to a depth of 30 cm, and (D) exchangeable NH4–N and NO3–N to a depth of 60 cm.

View larger version (30K): [in a new window]   Fig. 2. Relationships between rates of manure-N application and corn yield responses to fertilizer N applied at 100 kg ha–1 across (A) all sites and (B) sites treated with liquid swine manure that was injected into the soil.

View larger version (21K): [in a new window]   Fig. 3. Relationship between soil pH and corn yield responses to fertilizer N applied at 100 kg ha–1.

View larger version (30K): [in a new window]   Fig. 4. Relationships between corn yield response to fertilizer N applied at 100 kg ha–1 and soil test (A) P and (B) K in the surface 30-cm layer.

View larger version (24K): [in a new window]   Fig. 5. Relationship between corn yield responses to fertilizer N applied at 100 kg ha–1 and corn yield levels with the applied fertilizer.

View larger version (20K): [in a new window]   Fig. 6. Relationship between published yield potentials of soils and corn yield responses to fertilizer N applied at 100 kg ha–1.

View larger version (22K): [in a new window]   Fig. 7. Relationship between soil organic matter concentrations and corn yield response to fertilizer N applied at 100 kg ha–1.

View larger version (34K): [in a new window]   Fig. 8. Relationships between rates of manure-N application and soil (A) NO3–N to a depth of 60 cm and (B) exchangeable NH4–N and NO3–N to a depth of 60 cm.