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You searched for: Journal Transactions of the ASAE Remove constraint Journal: Transactions of the ASAE Subject losses from soil Remove constraint Subject: losses from soil Subject water pollution Remove constraint Subject: water pollution Text Availability Full Text Remove constraint Text Availability: Full Text
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1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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