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This article in SSSAJ

  1. Vol. 68 No. 2, p. 567-576
     
    Received: Apr 29, 2003
    Published: Mar, 2004


    * Corresponding author(s): hb91d@mizzou.edu
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doi:10.2136/sssaj2004.5670

Tillage and Crop Influences on Physical Properties for an Epiaqualf

  1. Humberto Blanco-Canqui *a,
  2. C. J. Gantzera,
  3. S. H. Andersona and
  4. E. E. Albertsb
  1. a Dep. of Soil and Atmospheric Sciences, Univ. of Missouri–Columbia, 302 Anheuser-Busch Natural Resources Building, Columbia, MO 65211
    b USDA-ARS, 246 Agricultural Engineering Building, Columbia, MO 65211

Abstract

Tillage impacts on soil properties differ among soils. This study investigated tillage, cropping, and wheel traffic (WT) effects of 13-yr of no-tillage (NT), chisel plow (CP), and moldboard plow (MP) under continuous corn (Zea mays L.) and soybean (Glycine max L.) including a check treatment of continuous cultivated fallow (CCF) on bulk density (ρb), organic matter (OM), soil–water retention, and saturated hydraulic conductivity (K sat) on a Mexico silt loam (fine, smectitic, mesic, Aeric Vertic Epiaqualf). Possible relationships between runoff and effective K sat (K eff) were also studied. Soil properties were determined on intact cores of 76-mm diam. collected from trafficked and nontrafficked positions for the 0- to 100-mm and 100- to 200-mm depths from the Midwest Research Claypan Farm erosion plots near Kingdom City, MO. Results show that the CCF had lower ρb, OM, K sat, and higher surface runoff than other treatments (P < 0.01). Tillage effects on soil properties among NT, CP, and MP were small and crop dependent. Corn had lower K sat (7.3 mm h−1) than soybean (11.7 mm h−1; P < 0.01). Conversely, corn had slightly higher ρb (1.53 Mg m−3) than soybean (1.48 Mg m−3; P < 0.01). The ρb increased from 1.47 to 1.52 Mg m−3 and OM decreased from 15.5 to 14.0 g kg−1 with depth (P < 0.01). Wheel traffic reduced K sat by three times and increased ρb by 6% (P < 0.01). Bulk density was a significant predictor of log K sat (P < 0.01) but not for soils under CCF management. The K eff was not related to runoff with the exception of the CCF treatment, which had slightly more runoff and lower K eff (P < 0.05). Overall, tillage treatments had no significant effects on soil properties; however, cropping and WT had small significant effects on ρb and K sat

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