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You searched for: Journal name Transactions of the ASAE Remove constraint Journal name: Transactions of the ASAE Subject water pollution Remove constraint Subject: water pollution Subject term losses from soil Remove constraint Subject term: losses from soil
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1. 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. 751-765
ISSN:
0001-2351
Subject:
sediment yield; phosphorus; silvicultural practices; pollution control; forested watersheds; nitrate nitrogen; losses from soil; phosphates; runoff; water pollution; simulation models; best management practices; erosion control; nonpoint source pollution; filter strips; forest roads; organophosphorus compounds; site preparation; environmental models; forest litter; organic nitrogen compounds; computer analysis; water erosion; 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

2. DRAINWAT-based methods for estimating nitrogen transport in poorly drained watersheds

Author:
Amatya, D.M.; Chescheir, G.M.; Fernandez, G.P.; Skaggs, R.W.; Gilliam, J.W.
Source:
Transactions of the ASAE 2004 v.47 no.3 pp. 677-687
ISSN:
0001-2351
Subject:
water pollution; simulation models; nitrogen; forested watersheds; streams; losses from soil; watershed hydrology; poorly drained soils; forest soils; hydrologic models; hydrochemistry; soil water movement; North Carolina
Abstract:
... Methods are needed to quantify effects of land use and management practices on nutrient and sediment loads at the watershed scale. Two methods were used to apply a DRAINMOD-based watershed-scale model (DRAINWAT) to estimate total nitrogen (N) transport from a poorly drained, forested watershed. In both methods, in-stream retention or losses of N were calculated with a lumped-parameter model, which ...

3. 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. 1183-1190
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

4. 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. 669-676
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

5. 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. 113-118
ISSN:
0001-2351
Subject:
soil nutrient balance; phosphorus; ammonium nitrogen; pollution control; nitrate nitrogen; losses from soil; phosphates; Triticum aestivum; water pollution; Zea mays; Glycine max; sorption; agricultural runoff; wheat straw; leaching; corn; nonpoint source pollution; winter wheat; nitrogen; soybeans
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

6. 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. 961-967
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

7. 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. 1201-1206
ISSN:
0001-2351
Subject:
water pollution; atrazine; cyanazine; agricultural land; herbicide residues; watersheds; losses from soil; streams; seasonal variation; metolachlor; alachlor; ametryn; coastal plains; 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

8. 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. 1713-1721
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