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You searched for: Subject watersheds Remove constraint Subject: watersheds Subject agricultural land Remove constraint Subject: agricultural land Subject water pollution Remove constraint Subject: water pollution
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1. Nitrogen and phosphorus in North Carolina coastal plain streams

Author:
Hunt, P.G.; Stone, K.C.; Humenik, F.J.; Rice, J.M.; Cook, M.G.
Source:
Clean water, clean environment, 21st century : team agriculture, working to protect water resources : conference proceedings, March 5-8, 1995, Kansas City, Missouri pp. -
Subject:
watersheds; water pollution; streams; coastal plains; water quality; ammonium nitrogen; phosphorus; nitrates; nitrate nitrogen; wetlands; agricultural land; crop production; animal production; swine; ammonium compounds; North Carolina
Handle:
10113/18275

2. Predicting Pesticide Runoff from Agricultural Land: A Conceptual Model

Author:
G. W. Bailey; R. R. Swank; H. P. Nicholson
Source:
Journal of environmental quality 1974 v.3 no.2 pp. 95-102
ISSN:
0047-2425
Subject:
agricultural land; agricultural runoff; basins; climatic factors; drainage channels; guidelines; mass transfer; mathematical models; meteorological data; particulates; pesticides; photochemistry; physicochemical properties; pollution load; prediction; rain; sediment transport; sediment yield; sediments; soil erosion; soil properties; topography; volatilization; water pollution; watersheds
Abstract:
... A mathematical model of the dynamic, single-rainfall-event type is being developed to describe quantitatively pesticide runoff as a function of pesticide and soil properties, agricultural practices, watershed characteristics, and climatic factors. From the model, guidelines governing pesticide use will be derived to prevent or minimize water pollution resulting from runoff from agricultural land. ...
DOI:
10.2134/jeq1974.00472425000300020001x

3. Sediment and Nutrient Loss from Clay Soils as Affected by Tillage

Author:
F. W. Chichester; C. W. Richardson
Source:
Journal of environmental quality 1992 v.21 no.4 pp. 587-590
ISSN:
0047-2425
Subject:
Sorghum bicolor; Triticum aestivum; Vertisols; Zea mays; agricultural land; agricultural runoff; chiseling; clay; clay soils; corn; environmental fate; losses from soil; no-tillage; nutrients; pollutants; rain; sediments; water pollution; water resources; watersheds; wheat; Texas
Abstract:
... Agricultural source pollution of water resources has been a source of concern in recent years. Research is needed to define mechanisms of chemical and sediment loss in runoff from agricultural land, and to develop management practices that minimize transport of these pollutants. This study was designed to compare the effect of no-till (NT) and conventional chisel-till (CT) soil management on runof ...
DOI:
10.2134/jeq1992.00472425002100040010x

4. Study of Pesticide Occurrence in Two Closely Spaced Lakes in Northeastern Nebraska

Author:
Roy F. Spalding; Daniel D. Snow; David A. Cassada; Mark E. Burbach
Source:
Journal of environmental quality 1994 v.23 no.3 pp. 571-578
ISSN:
0047-2425
Subject:
pesticide residues; temporal variation; lakes; agricultural land; watersheds; soil types; land use; hydrologic factors; water pollution; Nebraska
Abstract:
... Dissolved pesticide concentrations in 168 water samples collected from two closely-spaced lakes between early May 1990 and mid-June 1991 indicated large differences in impacts from watershed nonpoint source inputs. Pesticide levels in Maskenthine Lake, a small impoundment of 34 ha, increased in response to spring and early summer runoff events. Twelve pesticides [atrazine, 2-chloro-4-ethylamino-6- ...
DOI:
10.2134/jeq1994.00472425002300030024x

5. Fecal Bacteria in Agricultural Waters of the Bluegrass Region of Kentucky

Author:
J. M. Howell; M. S. Coyne; P. Cornelius
Source:
Journal of environmental quality 1995 v.24 no.3 pp. 411-419
ISSN:
0047-2425
Subject:
watersheds; agricultural land; water quality; Streptococcus; wells; springs (water); streams; topography; stream flow; groundwater; water pollution; Kentucky
Abstract:
... Agricultural runoff influenced by nonpoint pollution frequently exceeds the USEPA standards for bacterial contamination of primary contact water (200 fecal coliforms/100 mL). Few studies have evaluated the effect of cattle (Bos taurus) grazing on fecal contamination of ground water in the karst topography of central Kentucky. Our objectives were to: (i) observe the extent and pattern of fecal bact ...
DOI:
10.2134/jeq1995.00472425002400030003x

6. The nitrogen load to the Baltic Sea--present situation, acceptable future load and suggested source reduction

Author:
Enell, M.; Fejes, J.
Source:
Water, air, and soil pollution 1995 v.85 no.2 pp. 877-882
ISSN:
0049-6979
Subject:
water pollution; nitrogen; runoff; agricultural land; air pollution; watersheds; pollution control; agriculture; forestry; emissions; Scandinavia; Russia; Baltic States; Germany; Poland; Baltic Sea
DOI:
10.1007/BF00476940

7. Application of first-order and Monte Carlo analysis in watershed water quality models

Author:
Bobba, A.G.; Singh, V.P.; Bengtsson, L.
Source:
Water resources management 1996 v.10 no.3 pp. 219-240
ISSN:
0920-4741
Subject:
water pollution; Monte Carlo method; simulation models; rivers; water quality; agricultural land; equations; computer analysis; watersheds; streams; nonpoint source pollution; runoff; dissolved oxygen
Abstract:
... To achieve effective environmental control, it is important to develop methodologies for dealing with uncertainties in model simulation of pollution behaviour and effects. Several procedures have been proposed to quantify uncertainties in modelling studies. This paper utilizes the two methods that are widely applied, i.e. functional analysis and Monte Carlo Simulation. The first-order part of the ...
DOI:
10.1007/BF00424204

8. Gully treatment and water quality in the Southern Plains

Author:
Sharpley, A.; Smith, S.J.; Zollweg, J.A.; Coleman, G.A.
Source:
Journal of soil and water conservation 1996 v.51 no.6 pp. 498-503
ISSN:
0022-4561
Subject:
water pollution; sediments; simulation models; water quality; pollution control; Cynodon dactylon; agricultural land; nitrogen; ponds; bioavailability; watersheds; losses from soil; land restoration; cost benefit analysis; eutrophication; gully erosion; phosphorus; runoff; Oklahoma
Abstract:
... Erosion of agricultural land and transport of associated fertilizer chemicals nitrogen (N) and phosphorus (P) in runoff, can be detrimental to both soil productivity and water quality. In the Southern Plains, gully erosion is of concern due to periodically intense rainfall and a large acreage of erodible soils. As little information is available, we studied the loss of sediment, N, and P in runoff ...
Handle:
10113/20714

9. Watershed-based management strategies for the prevention and abatement of polluted agricultural runoff

Author:
Frarey, L.C.; Jones, H.H.
Source:
Environmental monitoring and assessment 1996 v.41 no.2 pp. 109-124
ISSN:
0167-6369
Subject:
water pollution; environmental law; pollution control; livestock production; agricultural land; watershed management; watersheds; concentrated animal feeding operations; state government; environmental impact; runoff; livestock feeding; federal government; point source pollution; Texas; Arkansas
DOI:
10.1007/BF00394338
PubMed:
24193308

10. Changes in fertilizer and manurial practices during 1960-1990: implications for N and P inputs to the Ythan catchment, N.E. Scotland

Author:
Domburg, P.; Edwards, A.C.; Sinclair, A.H.; Wright, G.G.; Ferrier, R.C.
Source:
Nutrient cycling in agroecosystems 1998 v.52 no.1 pp. 19-29
ISSN:
1385-1314
Subject:
water pollution; history; application rate; animal manures; nitrogen; agricultural land; algae; nitrate nitrogen; watersheds; swine; eutrophication; crop management; land use; grasslands; estuaries; poultry; phosphorus; Scotland; Northern Ireland
Abstract:
... A suggested increase in the growth of macrophytic algae within the Ythan estuary (N.E. Scotland) over recent years has been linked to the increased amounts of nitrogen in the form of NO3-N entering the estuary from the river. The increased NO3 concentration in the river has been associated with recent changes in farming practices in this predominantly agricultural catchment. Terrestrially derived ...

11. Effects of Agricultural Runoff Dispersion on Nitrate Reduction in Forested Filter Zone Soils

Author:
Louis V. Verchot; E. Carlyle Franklin; J. Wendell Gilliam
Source:
Soil Science Society of America journal 1998 v.62 no.6 pp. 1719-1724
ISSN:
0361-5995
Subject:
water pollution; pollution control; laboratory techniques; agricultural land; glucose; nitrate nitrogen; soil depth; watersheds; soil microorganisms; losses from soil; nonpoint source pollution; forest soils; soil profiles; population; denitrification; microbial activity; runoff; environmental exposure; nitrates; North Carolina
Abstract:
... Forested filter zones (FFZ) are being used more frequently for remediation of agricultural non-point source pollution. The objective of this study was to determine the effects of short-term dispersal (1–2 yr) of agricultural runoff on the denitrification potential of the soil microbial population and denitrification rates, to a depth of 1 m, in forest soils in two small watersheds (W1 and W2) in t ...
DOI:
10.2136/sssaj1998.03615995006200060033x

12. Lake Champlain basin nonpoint source phosphorus assessment

Author:
Meals, D.W.; Budd, L.F.
Source:
Journal of the American Water Resources Association 1998 v.34 no.2 pp. 251-265
ISSN:
1093-474X
Subject:
phosphorus; water pollution; eutrophication; watersheds; watershed management; watershed hydrology; land use; lakes; forests; agricultural land; urban areas; geographic information systems; nonpoint source pollution; Vermont; New York; Quebec
Abstract:
... Existing land use data were used to estimate nonpoint source phosphorus loads to Lake Champlain (Vermont/New York/Quebec) in a loading function model that combined P concentration coefficients with regional hydrologic data. The estimates were verified against monitored loading data, then used to assess the relative magnitudes of contributions from major land uses and regions of the Lake Champlain ...
DOI:
10.1111/j.1752-1688.1998.tb04132.x

13. Transport of dissolved inorganic nitrogen from the major rivers to estuaries in China

Author:
Shuiwang, D.; Shen, Z.; Hongyu, H.
Source:
Nutrient cycling in agroecosystems 2000 v.57 no.1 pp. 13-22
ISSN:
1385-1314
Subject:
nitrogen; rivers; estuaries; water pollution; measurement; water flow; nitrates; quantitative analysis; runoff; fertilizers; watersheds; agricultural land; duration; China

14. 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

15. Identifying critical sources of phosphorus export from agricultural watersheds

Author:
Weld, J.L.; Sharpley, A.N.; Beegle, D.B.; Gburek, W.J.
Source:
Nutrient cycling in agroecosystems 2001 v.59 no.1 pp. 29-38
ISSN:
1385-1314
Subject:
water pollution; water quality; agricultural land; leaching; risk assessment; watersheds; soil fertility; eutrophication; phosphorus; land use; runoff; Pennsylvania
Abstract:
... Surface runoff accounts for much of the phosphorus (P) input to and accelerated eutrophication of the fresh waters. Several states have tried to establish general threshold soil P levels above which the enrichment of surface runoff P becomes unacceptable. However, little information is available on the relationship between soil and surface runoff P, particularly for the northeastern United States. ...
Handle:
10113/18735

16. 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

17. Modeling phosphorus transport in agricultural watersheds: processes and possibilities

Author:
Sharpley, A.N.; Kleinman, P.J.A.; McDowell, R.W.; Gitau, M.; Bryant, R.B.
Source:
Journal of soil and water conservation 2002 v.57 no.6 pp. 425-439
ISSN:
0022-4561
Subject:
water pollution; overland flow; simulation models; animal manures; agricultural land; phosphorus fertilizers; watersheds; losses from soil; soil fertility; phosphorus; water erosion; subsurface flow
Abstract:
... Skip to main page content HOME CURRENT ISSUE ARCHIVE FEEDBACK SUBSCRIPTIONS ALERTS HELP Keywords Search Advanced »User Name Password Sign In Modeling phosphorus transport in agricultural watersheds: Processes and possibilities A. N. Sharpley, P. J. A. Kleinman, R. W. McDowell, M. Gitau, and R. B. Bryant ABSTRACT: Modeling phosphorus (P) loss from agricultural watersheds is key to quantifying the l ...
Handle:
10113/23631

18. Potential influence of sugarcane cultivation on estuarine water quality of Louisiana's Gulf Coast

Author:
Southwick, L.M.; Grigg, B.C.; Kornecki, T.S.; Fouss, J.L.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.15 pp. 4393-4399
ISSN:
0021-8561
Subject:
atrazine; herbicide residues; runoff; agricultural land; crop production; Saccharum officinarum; water pollution; estuaries; water quality; watersheds; surface water; nitrates; phosphorus; metolachlor; subsurface drainage; dissolved oxygen; Louisiana
Abstract:
... Sugarcane is cultivated on some 170000 ha of land in south central and southwestern Louisiana. This acreage drains into bayous and rivers that empty into Louisiana's coastal bays and estuaries. For a number of years the state's Department of Agriculture and Forestry and Department of Environmental Quality have collected water quality data from this sugarcane area. Study of these data shows that ap ...
DOI:
10.1021/jf010051v
PubMed:
12105976

19. Prevalence of Giardia and Cryptosporidium and characterization of Cryptosporidium spp. isolated from wildlife, human, and agricultural sources in the North Saskatchewan River Basin in Alberta, Canada

Author:
Heitman, T.L.; Frederick, L.M.; Viste, J.R.; Guselle, N.J.; Morgan, U.M.; Thompson, R.C.A.; Olson, M.E.
Source:
Canadian journal of microbiology 2002 v.48 no.6 pp. 530-541
ISSN:
0008-4166
Subject:
water pollution; Cryptosporidium parvum; oocysts; agricultural land; ribosomal DNA; polymerase chain reaction; cattle manure; feces; watersheds; sewage effluent; Giardia; wildlife; pig manure; Alberta
DOI:
10.1139/w02-047
PubMed:
12166680

20. Transport and retention of phosphorus pollutants in the landscape with a traditional, multipond system

Author:
Shan, B.; Yin, C.; Li, G.
Source:
Water, air, and soil pollution 2002 v.139 no.1/4 pp. 15-34
ISSN:
0049-6979
Subject:
water pollution; pollution control; surface water; agricultural land; ponds; watersheds; losses from soil; water flow; constructed wetlands; phosphorus; runoff; China