Cropping system influences on soil physical properties in the Great Plains
| Autor: | S. Merrill, J.L. Pikul, Robert Schwartz, J.G. Benjamin, R. L. Baumhardt |
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| Rok vydání: | 2006 |
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| Zdroj: | Renewable Agriculture and Food Systems. 21:15-25 |
| ISSN: | 1742-1713 1742-1705 |
| DOI: | 10.1079/raf2005122 |
| Popis: | 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 ( |
| Databáze: | OpenAIRE |
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