Northern Prairie Wildlife Research Center
Table 5: A comparison of the number of nesting species per field on conventional, minimum-tillage, and organic fields in fallow, sunflower, and wheat in North Dakota, 1992-93.
| Mean no. of species/fielda | SE | |
| Field type | ||
| Conventional | 0.9BC | 0.18 |
| Minimum-tillage | 1.9B | 0.22 |
| Organic | 1.6C | 0.18 |
| Crop type | ||
| Fallow | 1.9A | 0.23 |
| Sunflower | 1.2A | 0.19 |
| Wheat | 1.3 | 0.17 |
| aNumbers in the column followed by the same letter differ (P ≤ 0.05). | ||
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/birds/birduse/table5.htm
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