Author
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Kramer, Larry |
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Submitted to: Soil Erosion for 21st Century Symposium
Publication Type: Proceedings Publication Acceptance Date: 1/5/2001 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Runoff and soil loss under natural rainfall conditions from a small field-size watershed in the highly erosive deep loess soil region of southwest Iowa were summarized from observed events during the 1975-1991 period with the same corn cropping method. Observations were aggregated into cultural periods defined by crop production events of tillage, planting, cultivation, and harvest to evaluate seasonal responses. Descriptive statistics and frequency analysis of annual series of runoff and soil loss by cultural period were used to evaluate runoff and soil loss characteristics and risks. The seasonal period from spring tillage to first cultivation had the highest risk for soil loss and could benefit the most from soil conservation practices. Additional soil conservation practices are needed with this cropping method to reduce the 2-yr return frequency of annual soil loss from 10 Mg/ha to the level of tolerable soil loss of 6 Mg/ha for these loess soils. |
