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Spatial and Temporal Variation of Soil Nitrogen Parameters Related to Soil Texture and Corn Yield

^a Dep. of Soil and Crop Sci., Texas A&M Univ., College Station, TX 77843-2474
^b Texas A&M Univ. Agric. Res. and Ext. Cent., Rt. 3, Box 219, Lubbock, TX 79403-9803

View larger version (26K): [in a new window]   Fig. 1. Variograms for (a–d) soil NO3–N with depth, (e–f) total N, (g) mineralized N, and (h) percentage clay of the surface soil (0–15 cm) in 2002 and 2003.

View larger version (76K): [in a new window]   Fig. 2. Distribution of (a) corn yield and (b) percentage clay in the surface soil (0–15 cm) in 2002.

View larger version (599K): [in a new window]   Fig. 3. Kriged contour maps of (a–d) soil NO3–N with depth in 2002, (e–f) total N in 2002 and 2003, and (g) mineralized N in 2003.