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Diagnostic Tests for Site-Specific Nitrogen Recommendations for Winter Wheat

Dep. of Soil Sci., 1525 Observatory Drive, Univ. of Wisconsin, Madison, WI 53706-1299

View larger version (23K): [in a new window]   Fig. 1. Relationship between preplant soil NO3–N content (0 to 90 cm) and economic optimum N rate (EONR) for winter wheat from 21 site-years (solid line).

View larger version (23K): [in a new window]   Fig. 2. Relationship between preplant soil NO3–N content (0 to 90 cm) plus N fertilizer rate and relative grain yield from 21 site-years.

View larger version (18K): [in a new window]   Fig. 3. Relationship between preplant soil NO3–N content (0 to 90 cm) plus N fertilizer rate and winter wheat lodging from six site-years. Belgian lodging scale 0.2, none and 9.0, severe.

View larger version (17K): [in a new window]   Fig. 4. Relationship between winter wheat lodging and relative grain yield where the N fertilizer rate was greater than or equal to the economic optimum N rate from six site-years. Belgian scale 0.2, none and 9.0, severe.

View larger version (26K): [in a new window]   Fig. 5. Relationships between preplant soil NO3–N contents and economic gains using N rate recommendations adjusted for measured (0 to 90 cm) [solid line] and measured (0 to 60 cm) plus predicted (60 to 90 cm) [dashed line] preplant soil NO3 contents compared with base N rates from 21 site-years.