Abstract:
:Agricultural nutrient management is an issue due to P loss from fields and water quality degradation. This is especially true in watersheds where a history of P application in excess of crop needs has resulted in elevated soil P (legacy P). As practices and policy are implemented in such watersheds to reduce P loss, information is needed on time required to draw down soil P and how much P loss can be reduced by drawdown. We used the Annual P Loss Estimator (APLE) model to simulate soil P drawdown in Maryland, and to estimate P loss at a statewide scale associated with different combinations of soil P and P transport. Simulated APLE soil P drawdown compared well with measured rates from three field sites, showing that APLE can reliably simulate P dynamics for Maryland soils. Statewide APLE simulations of average annual P loss from cropland (0.84 kg ha) also compared well with estimates from the Chesapeake Bay Model (0.87 kg ha). The APLE results suggest that it is realistic to expect that a concerted effort to reduce high P soils throughout the state can reduce P loss to the Chesapeake Bay by 40%. However, P loss reduction would be achieved gradually over several decades, since soil P drawdown is very slow. Combining soil P drawdown with aggressive conservation efforts to reduce P transport in erosion could achieve a 62% reduction in state-level P loss. This 62% reduction could be considered a maximum amount possible that is still compatible with modern agriculture.
journal_name
J Environ Qualjournal_title
Journal of environmental qualityauthors
Vadas PA,Fiorellino NM,Coale FJ,Kratochvil R,Mulkey AS,McGrath JMdoi
10.2134/jeq2017.12.0481subject
Has Abstractpub_date
2018-05-01 00:00:00pages
480-486issue
3eissn
0047-2425issn
1537-2537journal_volume
47pub_type
杂志文章abstract::Transitional ecotones such as vegetated buffer strips, stream banks, and streambeds retain phosphorus (P) in the immediate surroundings of farmland. Yet the fate of P in these ecotones remains unclear. Our objectives were to (i) test the difference in the P pool composition of soil and sediment between sites surrounde...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2019.01.0012
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abstract::Research has shown that alum [Al(2)(SO(4))(3).14H(2)O] applications to poultry litter can greatly reduce phosphorus (P) runoff, as well as decrease ammonia (NH(3)) volatilization. However, the long-term effects of fertilizing with alum-treated litter are unknown. The objectives of this study were to evaluate the long-...
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journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:
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doi:10.2134/jeq2017.03.0117
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doi:10.2134/jeq2005.0056
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doi:10.2134/jeq2001.3051808x
更新日期:2001-09-01 00:00:00
abstract::Antibiotics may appear in the environment when manure, sewage sludge, and other organic amendments are added to soils. There is concern that the presence of antibiotics in soils may lead to the development of antibiotic-resistant bacteria which may spread to the rest of the environment. This paper aims at evaluating t...
journal_title:Journal of environmental quality
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doi:10.2134/jeq2005.0355
更新日期:2006-05-31 00:00:00
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abstract::Few effective strategies exist for remediating and restoring metal-contaminated soils. We have evaluated the potential of two environmentally compatible, nondestructive, biological soil-washing agents for remediating aged, lead-contaminated soils. Two contaminated soils were washed with 10 mM rhamnolipid biosurfactant...
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