3.1.3. N Efficiency

Differences in N efficiency for VRN and the FP were negatively associated with the clay soil texture (Pr ≤ 0.01) compared to sand and positively associated with loam soil texture (Pr ≤ 0.05) (Table 4). Soils that were richer in organic matter (Pr ≤ 0.01) had a positive association with N efficiency for VRN compared to FP. More erodible soils (Pr ≤ 0.01) or fields with warmer temperatures (Pr ≤ 0.01) had negative associations with VRN efficiency. While higher organic matter content (Pr ≤ 0.01) soils had a positive relation to N efficiency of VRN compared to FP, all else equal, fields with more erodible soils (Pr ≤ 0.01) and warmer temperatures (Pr ≤ 0.01) had negative associations to N use efficiency, likely due to the need for higher N rates.
