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1. Influence of summer management practices of grazed wheat pastures on runoff, sediment, and nutrient losses

Author:
Daniel, J.A.; Phillips, W.A.; Northup, B.K.
Source:
Transactions of the ASAE 2006 v.49 no.2 pp. 349
ISSN:
0001-2351
Subject:
Triticum aestivum; winter wheat; fallow; summer; legumes; grazing; cattle; crop management; agricultural runoff; sediment yield; losses from soil; soil nutrients; nitrate nitrogen; phosphorus; Oklahoma
Abstract:
... The agricultural economy of the southern Great Plains relies on practices that incorporate grazed winter wheat and associated summer management practices. Information exists about the impact of these practices on water quality, but data related to runoff and associated nutrient and sediment movement due to high intensity, late summer storms in the southern Great Plains are limited. This study exam ...
Handle:
10113/1345

2. Hydrologic and water-quality response of forested and agricultural lands during the 1999 extreme weather conditions in eastern North Carolina

Author:
Shelby, J.D.; Chescheir, G.M.; Skaggs, R.W.; Amatya, D.M.
Source:
Transactions of the ASAE 2005 v.48 no.6 pp. 2179
ISSN:
0001-2351
Subject:
forested watersheds; agricultural watersheds; watershed hydrology; hurricanes; storms; floods; coastal plains; water flow; stream flow; water quality; losses from soil; sediment yield; nitrogen; nonpoint source pollution; phosphorus; North Carolina
Abstract:
... This study evaluated hydrologic and water-quality data collected on a coastal-plain research watershed during a series of hurricanes and tropical storms that hit coastal North Carolina in 1999, including hurricanes Dennis, Floyd, and Irene. During September and October 1999, the research watershed received approximately 555 mm of rainfall associated with hurricanes. This was the wettest such perio ...
Handle:
10113/5541

3. Phosphorus component in AnnAGNPS

Author:
Yuan, Y.; Bingner, R.L.; Theurer, F.D.; Rebich, R.A.; Moore, P.A.
Source:
Transactions of the ASAE 2005 v.48 no.6 pp. 2145
ISSN:
0001-2351
Subject:
nonpoint source pollution; phosphorus; losses from soil; agricultural soils; simulation models; agricultural watersheds; AGNPS model; soil nutrients; Mississippi
Abstract:
... The USDA Annualized Agricultural Non-Point Source Pollution model (AnnAGNPS) has been developed to aid in evaluation of watershed response to agricultural management practices. Previous studies have demonstrated the capability of the model to simulate runoff and sediment, but not phosphorus (P). The main purpose of this article is to evaluate the performance of AnnAGNPS on P simulation using compa ...
Handle:
10113/5540

4. Sensitivity analyses of the nitrogen simulation model, DRAINMOD-N II

Author:
Wang, X.; Youssef, M.A.; Skaggs, R.W.; Atwood, J.D.; Frankenberger, J.R.
Source:
Transactions of the ASAE 2005 v.48 no.6 pp. 2205
ISSN:
0001-2351
Subject:
nitrate nitrogen; nitrogen; losses from soil; drainage water; drainage; agricultural management models; mathematical models; simulation models; sandy loam soils; agricultural soils; model validation; North Carolina
Abstract:
... A two-step global sensitivity analysis was conducted for the nitrogen simulation model DRAINMOD-N II to assess the sensitivity of model predictions of NO3-N losses with drainage water to various model inputs. Factors screening using the LH-OAT (Latin hypercube sampling - one at a time) sensitivity analysis method was performed as a first step considering 48 model parameters; then a variance-based ...
Handle:
10113/5542

5. Uncertainty in measured sediment and nutrient flux in runoff from small agricultural watersheds

Author:
Harmel, R.D.; King, K.W.
Source:
Transactions of the ASAE 2005 v.48 no.5 pp. 1713
ISSN:
0001-2351
Subject:
agricultural watersheds; agricultural runoff; sediment yield; losses from soil; nitrate nitrogen; phosphates; nitrates; nonpoint source pollution; water pollution; measurement; water quality; sampling; storms; Texas
Abstract:
... Storm water quality sampling techniques vary considerably in the resources required for sample collection and analysis, and potentially in the resulting constituent flux estimates. However, quantitative information on sampling error is rarely available for use in selecting appropriate sampling techniques and for evaluating the effects of various techniques on measured results. In an effort to quan ...
Handle:
10113/5523

6. Quantifying the sensitivity of the Riparian Ecosystem Management Model (REMM) to changes in climate and buffer characteristics common to conservation practices

Author:
Graff, C.D.; Sadeghi, A.M.; Lowrance, R.R.; Williams, R.G.
Source:
Transactions of the ASAE 2005 v.48 no.4 pp. 1377
ISSN:
0001-2351
Subject:
hydrologic models; mathematical models; simulation models; watersheds; watershed hydrology; riparian buffers; nitrogen; phosphorus; nonpoint source pollution; losses from soil; nitrates; plant growth; climate change; leaf area index; rooting
Abstract:
... Conservation practices, such as buffers, are often installed to mitigate the effects of nutrients and sediment runoff from agricultural practices. The Riparian Ecosystem Management Model (REMM) was developed as process-based model to evaluate the fate of nutrients and sediment through a riparian buffer up to the edge of a stream. A one-at-a-time sensitivity analysis was performed on REMM to evalua ...
Handle:
10113/5515

7. Comparison of measured and simulated phosphorus losses wtih indexed site vulnerability

Author:
Veith, T.L.; Sharpley, A.N.; Weld, J.L.; Gburek, W.J.
Source:
Transactions of the ASAE 2005 v.48 no.2 pp. 557
ISSN:
0001-2351
Subject:
phosphorus; losses from soil; agricultural soils; agricultural land; nonpoint source pollution; fields; risk assessment; Soil and Water Assessment Tool model; watersheds; agricultural watersheds; Pennsylvania
Abstract:
... Nonpoint-source losses of agricultural phosphorus (P) at field and watershed scales must be quantified to facilitate selection and placement of P control measures. Quantification of P loss has been pursued through field monitoring, simulation models, and risk assessment indices. However, the intended users of these methods differ, impacting each method's functional design and ease-of-use. For exam ...
Handle:
10113/5492

8. Forest site preparation effects on soil and nutrient losses in east Texas

Author:
Field, J.P.; Farrish, K.W.; Oswald, B.P.; Romig, M.T.; Carter, E.A.
Source:
Transactions of the ASAE 2005 v.48 no.2 pp. 861
ISSN:
0001-2351
Subject:
site preparation; afforestation; forest plantations; Pinus taeda; herbicides; pesticide application; tillage; prescribed burning; forest soils; soil fertility; nutrient content; losses from soil; water erosion; clearcutting; Texas
Abstract:
... Site preparation practices are frequently utilized in Southern pine ecosystems to facilitate planting and seedling establishment. Soil and nutrient losses were monitored in 12 bordered erosion plots following four site preparation treatments in a clearcut harvested loblolly pine (Pinus taeda L.) forest in east Texas. Three replications of four site preparation treatments were used: (1) chemical he ...
Handle:
10113/5502

9. Potential effects of climate change on rainfall erosivity in the Yellow River basin of China

Author:
Zhang, G.H.; Nearing, M.A.; Liu, B.Y.
Source:
Transactions of the ASAE 2005 v.48 no.2 pp. 511
ISSN:
0001-2351
Subject:
rain; water erosion; precipitation; climate change; sediment yield; losses from soil; General Circulation Models; China
Abstract:
... Severe soil erosion in the Yellow River basin is a significant obstruction to the sustainable management of soil and water resources. Any changes in soil erosion will have great effects on long-term planning of soil and water conservation in such a severely eroded basin. Rainfall erosivity describes the soil loss potential caused by rain, which can be expected to change in correspondence to change ...
Handle:
10113/5489

10. Prediction of pesticide losses in surface runoff from agricultural fields using GLEAMS and RZWQM

Author:
Chinkuyu, A.; Meixner, T.; Gish, T.; Daughtry, C.
Source:
Transactions of the ASAE 2005 v.48 no.2 pp. 585
ISSN:
0001-2351
Subject:
agricultural land; fields; nonpoint source pollution; losses from soil; prediction; GLEAMS model; Root Zone Water Quality Model; herbicide residues; atrazine; metolachlor; agricultural runoff; seepage; Maryland
Abstract:
... Seepage zones have been shown to be of critical importance in controlling contaminant export from agricultural watersheds. To date, no multipurpose agricultural water quality model has seepage zones incorporated into its process-level representations. We chose to test two widely used models of agricultural water quality, the Groundwater Loading Effects of Agricultural Management Systems (GLEAMS) a ...
Handle:
10113/5494

11. Application of APEX for forestry

Author:
Saleh, A.; Williams, J.R.; Wood, J.C.; Hauck, L.M.; Blackburn, W.H.
Source:
Transactions of the ASAE 2004 v.47 no.3 pp. 751
ISSN:
0001-2351
Subject:
forested watersheds; silvicultural practices; site preparation; losses from soil; nitrate nitrogen; organic nitrogen compounds; phosphates; organophosphorus compounds; phosphorus; sediment yield; runoff; forest roads; water erosion; simulation models; mathematical models; erosion control; filter strips; pollution control; best management practices; water pollution; nonpoint source pollution; environmental models; forest litter; computer analysis; Texas
Abstract:
... This study was conducted to determine if the Agricultural Policy/Environmental Extender (APEX) model could reasonably replicate the effects of silvicultural practices on streamflow and loading of sediments and nutrients. APEX was modified to enhance factors associated with forestry conditions such as rainfall interception by canopy, litter, subsurface flow, nutrient movement, and routing enrichmen ...
Handle:
10113/9677

12. Fenamiphos losses under simulated rainfall: plot size effects

Author:
Wauchope, R.D.; Truman, C.C.; Johnson, A.W.; Sumner, H.R.; Hook, J.E.; Dowler, C.C.; Chandler, L.D.; Gascho, G.J.; Davis, J.G.
Source:
Transactions of the ASAE 2004 v.47 no.3 pp. 669
ISSN:
0001-2351
Subject:
fenamiphos; pesticide residues; metabolites; losses from soil; agricultural runoff; rain; agricultural soils; sandy soils; field experimentation; experimental design; soil pollution; water pollution; loamy sand soils; Georgia
Abstract:
... The purpose of this study was to compare two commonly used runoff experimental methods, which have different scales, on measurements of runoff and associated fenamiphos and metabolite losses over a 2-year period. Methods used were 15 m wide by 43 m long (645 m2) mesoplots and 1.8 m wide by 3 m long (5.4 m2) microplots, under simulated rainfall (25 mm h-1 for 2 h) at 1, 14, and 28 d after fenamipho ...
Handle:
10113/9676

13. Climate impacts on nitrate loss in drainage waters from a southern alluvial soil

Author:
Grigg, B.C.; Southwick, L.M.; Fouss, J.L.; Kornecki, T.S.
Source:
Transactions of the ASAE 2004 v.47 no.2 pp. 445
ISSN:
0001-2351
Subject:
alluvial soils; fields; surface drainage; subsurface drainage; nitrate nitrogen; drought; nonpoint source pollution; losses from soil; rain; agricultural runoff; Louisiana
Abstract:
... Fertilizer nitrogen transported via agricultural drainage has caused eutrophication of nearby surface waters. In the Lower Mississippi River Valley region, periods of drought are occurring more frequently. The impacts of drought on nutrient loss from agricultural lands of this region have not been reported. Field studies were used to evaluate the impact of climate (rainfall) on nitrate loss from a ...
Handle:
10113/9688

14. Leaching and sorption of nitrogen and phosphorus by crop residue

Author:
Cermak, J.D.; Gilley, J.E.; Eghball, B.; Wienhold, B.J.
Source:
Transactions of the ASAE 2004 v.47 no.1 pp. 113
ISSN:
0001-2351
Subject:
nitrogen; nitrate nitrogen; ammonium nitrogen; phosphorus; phosphates; leaching; losses from soil; sorption; crop residues; wheat straw; winter wheat; Triticum aestivum; Glycine max; soybeans; Zea mays; corn; pollution control; agricultural runoff; nonpoint source pollution; water pollution; soil nutrient balance
Abstract:
... Overland flow from cropland areas often contains nutrients and residue materials can either contribute to runoff nutrient load through leaching or remove nutrients by sorption. Measurements were made of leaching and sorption of nitrogen and phosphorus from corn (Zea mays L.), soybean (Glycine max (L.) Merr.) and winter wheat (Triticum aestivum L. cv. Pastiche) residues placed in solutions containi ...
Handle:
10113/8028

15. Drainage system impacts on surface runoff, nitrate loss, and crop yield on a southern alluvial soil

Author:
Grigg, B.C.; Southwick, L.M.; Fouss, J.L.; Kornecki, T.S.
Source:
Transactions of the ASAE 2003 v.46 no.6 pp. 1531
ISSN:
0001-2351
Subject:
agricultural land; alluvial soils; subsurface drainage; surface drainage; high water table; fields; runoff; nitrates; losses from soil; Zea mays; corn; crop production; grain yield; deep tillage; subsurface irrigation; Louisiana
Abstract:
... Excess rainfall and subsequent surface runoff is a challenge to farmers of the Lower Mississippi River Valley region. In 1993, we established an experimental field site in Baton Rouge, Louisiana, consisting of 16 hydraulically isolated plots (0.2 ha) on a Commerce soil (Aeric Fluvaquents). Our objective was to determine drainage system impacts on surface runoff, subsurface drainage effluent, nitra ...
Handle:
10113/13817

16. Dissolved phosphorus transport during storm and base flow conditions from an agriculturally intensive southeastern Coastal Plain watershed

Author:
Novak, J.M.; Stone, K.C.; Watts, D.W.; Johnson, M.H.
Source:
Transactions of the ASAE 2003 v.46 no.5 pp. 1355
ISSN:
0001-2351
Subject:
coastal plains; agricultural watersheds; stream flow; losses from soil; phosphorus; agricultural land; nonpoint source pollution; water quality; rain; pollution load; storms; North Carolina
Abstract:
... The high density of animal production in southeastern Coastal Plain watersheds has caused some soils to contain excess amounts of plant-available soil phosphorus (P). Runoff, erosion, and leaching can transport P to surface water systems and out of these watersheds. High P concentrations in downstream aquatic ecosystems can increase the risk of eutrophication. Our objectives were to determine stre ...
Handle:
10113/18976

17. Residual effects of compost and fertilizer applications on nutrients in runoff

Author:
Gilley, J.E.; Eghball, B.
Source:
Transactions of the ASAE 2002 v.45 no.6 pp. 1905
Subject:
composted manure; cattle manure; soil amendments; fertilizer application; nitrogen fertilizers; phosphorus fertilizers; residual effects; clay loam soils; nitrogen; phosphorus; losses from soil; agricultural runoff; soil fertility; soil nutrients; Zea mays; corn; crop residues; nonpoint source pollution; Nebraska
Abstract:
... The application of compost or fertilizer at rates that exceed crop nutrient requirements can result in phosphorus (P) and nitrogen (N) accumulation in soil. This study was conducted to determine the influence of soil P and N contents on the concentrations and total amounts of P and N transported in runoff. Composted beef cattle feedlot manure or inorganic fertilizer were added from 1992 to 1995 to ...
Handle:
10113/17449

18. Nutrients in runoff following the application of swine manure to interrill areas

Author:
Gilley, J.E.; Eghball, B.; Wienhold, B.J.; Miller, P.S.
Source:
Transactions of the ASAE 2001 v.44 no.6 pp. 1651
Subject:
pig manure; manure spreading; agricultural soils; sandy loam soils; silt loam soils; clay soils; nitrogen; phosphorus; losses from soil; agricultural runoff; interrill erosion; animal manure management; nutrient management; swine feeding; corn; silty clay soils
Abstract:
... The P content of swine manure can be reduced through the addition of feed supplements or the use of selected corn hybrids. This study was conducted to compare interrill runoff losses of P and N from three soils following the application of swine manure obtained from selected diets. The soils used in this investigation included a Hersh sandy loam, Pierre silty clay, and Sharpsburg silt loam. Simula ...
Handle:
10113/8165

19. Evaluation of AnnAGNPS on Mississippi Delta MSEA watersheds

Author:
Yuan, Y.; Bingner, R.L.; Rebich, R.A.
Source:
Transactions of the ASAE 2001 v.44 no.5 pp. 1183
ISSN:
0001-2351
Subject:
watersheds; crop production; crop management; cover crops; winter; pollution control; water pollution; erosion control; water erosion; sediment yield; simulation models; agricultural land; losses from soil; runoff; prediction; best management practices; nonpoint source pollution; Mississippi
Abstract:
... Sediment and its associated pollutants entering a water body can be very destructive to the health of that system. Best Management Practices (BMPs) can be used to reduce these pollutants, but understanding the most effective practices is very difficult. Watershed models are the most cost-effective tools to aid in the decision-making process of selecting the BMP that is most effective in reducing t ...
Handle:
10113/26652

20. Seasonal occurrence and export of five herbicides from a North Carolina Coastal Plain watershed

Author:
Novak, J.M.; Watts, D.W.; Stone, K.C.; Johnson, M.H.
Source:
Transactions of the ASAE 2001 v.44 no.5 pp. 1201
ISSN:
0001-2351
Subject:
coastal plains; watersheds; herbicide residues; alachlor; ametryn; cyanazine; metolachlor; atrazine; herbicides; losses from soil; streams; water pollution; agricultural land; seasonal variation; North Carolina
Abstract:
... Herbicide detection in surface water sources has caused concern about contamination of these sources and adverse effects on human and aquatic health. Understanding surface water herbicide transport from agriculturally intensive watersheds is useful for development of herbicide best management practices to reduce off-site movement. The seasonal occurrence and load of five herbicides exported by a s ...
Handle:
10113/18427

21. Runoff and soil loss as affected by the application of manure

Author:
Gilley, J.E.; Risse, L.M.
Source:
Transactions of the ASAE 2000 v.43 no.6 pp. 1583
ISSN:
0001-2351
Subject:
soil erosion; runoff; land application; losses from soil; animal manures; excreta
Abstract:
... Manure has been used effectively to improve crop production and soil properties because it contains nutrients and organic matter. While it is generally accepted that the improved soil properties associated with manure application lead to changes in runoff and soil erosion, few studies have quantified these impacts. Water quality models used to assess watershed management and estimate total maximum ...
Handle:
10113/16462

22. Runoff and erosion from interrill areas as affected by the application of manure

Author:
Gilley, E.; Eghball, B.; Blumenthal, J.M.; Baltensperger, D.D.
Source:
Transactions of the ASAE 1999 v.42 no.4 pp. 975
ISSN:
0001-2351
Subject:
animal manures; interrill erosion; runoff; sandy loam soils; land application; losses from soil; simulation models
Abstract:
... This study was conducted to measure runoff and erosion from interrill areas as affected by the long-term application of manure and fertilizer to a Tripp sandy loam soil located near Mitchell, Nebraska. Soil which had been removed from the top 0.1 m of the soil profile was placed in a 1 m(2) soil pan. Rainfall was then applied to the soil pan during initial and wet simulation events. Total runoff w ...
Handle:
10113/17291

23. Effects of surface treatment of surface sealing, runoff, and interrill erosion

Author:
Zhang, X.C.; Miller, W.P.; Nearing, M.A.; Norton, L.D.
Source:
Transactions of the ASAE 1998 v.41 no.4 pp. 989
ISSN:
0001-2351
Subject:
soil amendments; phosphogypsum; polyacrylamide; soil treatment; tillage; runoff; losses from soil; rill erosion; soil morphological features; sandy loam soils; Georgia
Abstract:
... Surface treatment influences the nature and extent of seal/crust formation, which affects runoff and erosion. This study evaluated the effects and longevity of soil amendments, tillage, and screen cover on runoff and interrill erosion on a Cecil sandy loam (clayey, kaolinitic, thermic Typic Kanhapludult) under natural rainfall conditions. Six field plots (3.5 x 0.9 m) with a slope of 0.06-m m-l we ...
Handle:
10113/7156

24. Seasonal changes in flow and nitrate-N loss from subsurface drains

Author:
Bjorneberg, D.L.; Kanwar, R.S.; Melvin, S.W.
Source:
Transactions of the ASAE 1996 v.39 no.3 pp. 961
ISSN:
0001-2351
Subject:
loam soils; Zea mays; Glycine max; nitrate nitrogen; losses from soil; tillage; subsurface drainage; crop rotation; continuous cropping; denitrification; drainage water; water quality; seasonal variation; rain; water pollution; crop yield; preferential flow; Iowa
Abstract:
... Subsurface drainage from thirty-six, 0.4-ha plots was monitored for three years (1990 to 1992) from chisel plow, moldboard plow, ridge till, and no-till systems with continuous corn and corn-soybean rotations. Data were analyzed in four seasonal stages to determine variations in drain flows and nitrate-N contents in drain effluent. The hypothesis of this study was that differences among tillage sy ...
Handle:
10113/14444

25. Slope gradient effects on soil loss for steep slopes

Author:
Lui, B.Y.; Nearing, M.A.; Risse, L.M.
Source:
Transactions of the ASAE 1994 v.37 no.6 pp. 1835
ISSN:
0001-2351
Subject:
losses from soil; Universal Soil Loss Equation; slope; runoff; loess; water erosion; China
Abstract:
... Data for assessing the effects of slope gradient on soil erosion for the case of steep slopes are limited. Widely used relationships are based primarily on data that were collected on slopes up to approximately 25%. These relationships show a reasonable degree of uniformity in soil loss estimates on slopes within that range, but are quite different when extrapolated beyond the range of the measure ...
Handle:
10113/6594

26. Effect of extractable soil surface phosphorus on runoff water quality

Author:
Daniel, T.C.; Edwards, D.R.; Sharpley, A.N.
Source:
Transactions of the ASAE 1993 v.36 no.4 pp. 1079
ISSN:
0001-2351
Subject:
losses from soil; phosphorus; pollution; runoff; water quality; Arkansas
Abstract:
... Phosphorus (P) additions to surface water from agricultural nonpoint sources are of concern, because P often limits eutrophication of surface waters. Numerous sources of runoff P exist: indigenous soil and plant material, land-applied manure and sludge, and commercial fertilizer. In many soils receiving commercial fertilizer and manure, concentrations of P at the soil surface have been steadily ri ...
Handle:
10113/19191

27. Uncertainty analysis of the WEPP soil erosion model

Author:
Chasves, H.M.L.; Nearing, M.A.
Source:
Transactions of the ASAE 1991 v.34 no.6 pp. 2437
ISSN:
0001-2351
Subject:
water erosion; prediction; losses from soil; simulation models
Abstract:
... Predictions from hydrologic and erosion models contain a large degree of uncertainty. The Modified Point Estimate Method (Harr, 1989) used in conjunction with a response surface exploration technique (Brooks, 1958) provides a simple, computationally efficient, and powerful tool for evaluating uncertainty of predictions by natural-resource models. The method allows analysis of models with a large n ...
Handle:
10113/6586