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Cropping system influences on soil physical properties in the Great Plains

Published online by Cambridge University Press:  12 February 2007

J.L. Pikul Jr ,
R.C. Schwartz ,
J.G. Benjamin ,
R.L. Baumhardt  and
S. Merrill
J.L. Pikul Jr*
Affiliation:
USDA-ARS, 2923 Medary Ave., Brookings, SD, 57006, USA.
R.C. Schwartz
Affiliation:
USDA-ARS, PO Drawer 10, Bushland, TX, 79012, USA.
J.G. Benjamin
Affiliation:
USDA-ARS, 40335, County Road GG, Akron, CO, 80720, USA.
R.L. Baumhardt
Affiliation:
USDA-ARS, PO Drawer 10, Bushland, TX, 79012, USA.
S. Merrill
Affiliation:
USDA-ARS, PO Box 459, Mandan, ND, 58554-0459, USA.
*
*Corresponding author: Email: [email protected]
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Abstract

Agricultural systems produce both detrimental and beneficial effects on soil quality (SQ). We compared soil physical properties of long-term conventional (CON) and alternative (ALT) cropping systems near Akron, Colorado (CO); Brookings, South Dakota (SD); Bushland, Texas (TX); Fargo, North Dakota (ND); Mandan (ND); Mead, Nebraska (NE); Sidney, Montana (MT); and Swift Current, Saskatchewan (SK), Canada. Objectives were to quantify the changes in soil physical attributes in cropping systems and assess the potential of individual soil attributes as sensitive indicators of change in SQ. Soil samples were collected three times per year from each treatment at each site for one rotation cycle (4 years at Brookings and Mead). Water infiltration rates were measured. Soil bulk density (BD) and gravimetric water were measured at 0–7.5, 7.5–15, and 15–30 cm depth increments and water-filled pore space ratio (WFPS) was calculated. At six locations, a rotary sieve was used to separate soil (top 5 cm) into six aggregate size groups and calculate mean weight diameter (MWD) of dry aggregates. Under the CON system at Brookings, dry aggregates (>19 mm) abraded into the smallest size class (<0.4 mm) on sieving. In contrast, the large aggregates from the ALT system abraded into size classes between 2 and 6 mm. Dry aggregate size distribution (DASD) shows promise as an indicator of SQ related to susceptibility of soil to wind erosion. Aggregates from CON were least stable in water. Soil C was greater under ALT than CON for both Brookings and Mead. At other locations, MWD of aggregates under continuous crop or no tillage (ALT systems) was greater than MWD under CON. There was no crop system effect on water infiltration rates for locations having the same tillage within cropping system. Tillage resulted in increased, decreased, or unchanged near-surface BD. Because there was significant temporal variation in water infiltration, MWD, and BD, conclusions based on a single point-in-time observation should be avoided. Elevated WFPS at Fargo, Brookings, and Mead may have resulted in anaerobic soil conditions during a portion of the year. Repeated measurements of WFPS or DASD revealed important temporal characteristics of SQ that could be used to judge soil condition as affected by management.

Keywords

soil bulk densitydry aggregate stabilityrotary sieveaggregate size distributionwater infiltration ratewater filled pore spacesoil organic carbon
Type
Research Article
Information
Renewable Agriculture and Food Systems , Volume 21 , Issue 1 , March 2006 , pp. 15 - 25
Copyright
Copyright © Cambridge University Press 2006

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