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Spectral Analysis of Tillage-Induced Differences in Soil Spatial Variability

^a Dep. of Geological Sciences, Univ. of Tennessee, Knoxville, TN 37996-1410
^b Département des Sols et de Génie agro-alimentaire, Université Laval, Pavillon Comtois, Sainte-Foy, PQ, Canada G1K 7P4

View larger version (141K): [in a new window]   Fig. 1. Conventional- and no-till transects for Replication 1: (a) gravimetric water content, (b) volumetric water content, (c) bulk density, and (d) total C. Treatment labels: 0, 84, 168, and 336 = N fertilizer rate (kg ha-1), R = ryegrass cover, and V = hairy vetch cover.

View larger version (54K): [in a new window]   Fig. 2. Average periodograms for the conventional- and no-till treatments: (a) gravimetric water content, (b) volumetric water content, (c) bulk density, and (d) total C.

View larger version (32K): [in a new window]   Fig. 3. F-values from the spectral ANOVAs for each soil property. Solid horizontal line delimits statistical significance at the 0.05 probability level.

View larger version (50K): [in a new window]   Fig. 4. Average coherency analyses for the conventional- and no-till treatments: (a) gravimetric water content versus total C (TC), (b) volumetric water content versus TC, and (c) bulk density versus TC. Solid horizontal lines delimit statistical significance at the 0.05 probability level.