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- Title
Relationship between phosphorus levels in three Ultisols and phosphorus concentrations in runoff
- Authors
Pote, D. H.; Daniel, T. C.; Nichols, D. J.; Edwards, D. R.; Miller, D. M.; Sharpley, A. N.; Moore, Jr., P. A.
- Abstract
Soils that contain high P levels can become a primary source of dissolved reactive P (DRP) in runoff, and thus contribute to accelerated eutrophication of surface waters. In a previous study on Captina soil, several soil test P (STP) methods gave results that were significantly correlated to DRP levels in runoff, but distilled H2O and NH4-oxalate methods gave the best correlations. Because results might differ on other soils, runoff studies were conducted on three additional Utisols to identify the most consistent STP method for predicting runoff DRP levels, and determine effects of site hydrology on correlations between STP and runoff DRP concentrations. Surface soil (02 cm depth) of pasture plots was analyzed by Mehlich III,Olsen, Morgan, Bray-Kurtz P1, NH4- oxalate, and distilledH2O methods. Also, P saturation of each soil was determined by three different methods. Simulated rain (75 mm h-1) produced 30 min of runoff from each plot. All correlations of STP to runoff DRP were significant (P < 0.01) regardless of soil series or STP method, with most STP methods giving high correlations (r > 0.90) on all three soils. For a given level of H2O-extractable STP, low runoff volumes coincided with low DRP concentrations. Therefore, when each DRP concentration was divided by volume of plot runoff,correlations to H2O-extractable STP had the same (P < 0.05) regression fine for every soil. This suggests the importance of she hydrology in determining P loss in runoff and may provide a means of developing a single relationship far a range of soil series.
- Subjects
PHOSPHORUS; RUNOFF; AGRICULTURE
- Publication
Journal of Environmental Quality, 1999, Vol 28, Issue 1, p170
- ISSN
0047-2425
- Publication type
Article
- DOI
10.2134/jeq1999.00472425002800010020x