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Spatial and Temporal Variability of Soil Nitrate and Corn Yield

Multifractal Analysis

^a USDA-ARS, 121 Keim Hall, Univ. of Nebraska, Lincoln, NE 68583
^b Dep. of Eng. Mechanics, Univ. of Nebraska, Lincoln, NE 68583

View larger version (35K): [in a new window]   Fig. 1. The grid arrangements for the multifractal analysis. (a) is the sampling grids of the soil NO3–N and grain yield for the uniform N treatment (sampling point is indicated by a dot); (b), (c), and (d) are different multifractal cell sizes.

View larger version (27K): [in a new window]   Fig. 2. Residual soil nitrate D(q) values as a function of increasing q values for four N treatments in 4 yr.

View larger version (23K): [in a new window]   Fig. 3. Multifractal spectrums for residual soil NO3–N for four N treatments in 4 yr.

View larger version (68K): [in a new window]   Fig. 4. Residual soil NO3–N distribution for four treatments in 1995. Each map was generated using the data from the strips of that treatment.

View larger version (24K): [in a new window]   Fig. 5. Corn grain yield D(q) values as a function of increasing q values for four N treatments in 3 yr.

View larger version (20K): [in a new window]   Fig. 6. Multifractal spectrums for corn grain yield for four N treatments in 3 yr.

View larger version (60K): [in a new window]   Fig. 7. Corn grain yield distribution for four treatments in 1997. Each map was generated using the data from the strips of that treatment.