Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 55
Book Description
A geographic information system (GIS) was used to estimate agricultural pesticide use in the drainage basins of streams that are studied as part of the U.S. Geological Survey's National Water-Quality Assessment (NAWQA) Program. Drainage basin pesticide use estimates were computed by intersecting digital maps of drainage basin boundaries with an enhanced version of the National Land Cover Data 1992 combined with estimates of 1992 agricultural pesticide use in each United States county. This report presents the methods used to quantify agricultural pesticide use in drainage basins using a GIS and includes the estimates of atrazine use applied to row crops, small-grain crops, and fallow lands in 150 watersheds in the conterminous United States. Basin atrazine use estimates are presented to compare and analyze the results that were derived from 30-meter and 1-kilometer resolution land cover and county pesticide use data, and drainage basin boundaries at various grid cell resolutions. Comparisons of the basin atrazine use estimates derived from watershed boundaries, county pesticide use, and land cover data sets at different resolutions, indicated that overall differences were minor. The largest potential for differences in basin pesticide use estimates between those derived from the 30-meter and 1-kilometer resolution enhanced National Land Cover Data 1992 exists wherever there are abrupt agricultural land cover changes along the basin divide. Despite the limitations of the drainage basin pesticide use data described in this report, the basin estimates provide consistent and comparable indicators of agricultural pesticide application in surface-water drainage basins studied in the NAWQA Program.
Estimation of Agricultural Pesticide Use in Drainage Basins Using Land Cover Maps and County Pesticide Data. National Water-Quality Assessment Program
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 55
Book Description
A geographic information system (GIS) was used to estimate agricultural pesticide use in the drainage basins of streams that are studied as part of the U.S. Geological Survey's National Water-Quality Assessment (NAWQA) Program. Drainage basin pesticide use estimates were computed by intersecting digital maps of drainage basin boundaries with an enhanced version of the National Land Cover Data 1992 combined with estimates of 1992 agricultural pesticide use in each United States county. This report presents the methods used to quantify agricultural pesticide use in drainage basins using a GIS and includes the estimates of atrazine use applied to row crops, small-grain crops, and fallow lands in 150 watersheds in the conterminous United States. Basin atrazine use estimates are presented to compare and analyze the results that were derived from 30-meter and 1-kilometer resolution land cover and county pesticide use data, and drainage basin boundaries at various grid cell resolutions. Comparisons of the basin atrazine use estimates derived from watershed boundaries, county pesticide use, and land cover data sets at different resolutions, indicated that overall differences were minor. The largest potential for differences in basin pesticide use estimates between those derived from the 30-meter and 1-kilometer resolution enhanced National Land Cover Data 1992 exists wherever there are abrupt agricultural land cover changes along the basin divide. Despite the limitations of the drainage basin pesticide use data described in this report, the basin estimates provide consistent and comparable indicators of agricultural pesticide application in surface-water drainage basins studied in the NAWQA Program.
Publisher:
ISBN:
Category :
Languages : en
Pages : 55
Book Description
A geographic information system (GIS) was used to estimate agricultural pesticide use in the drainage basins of streams that are studied as part of the U.S. Geological Survey's National Water-Quality Assessment (NAWQA) Program. Drainage basin pesticide use estimates were computed by intersecting digital maps of drainage basin boundaries with an enhanced version of the National Land Cover Data 1992 combined with estimates of 1992 agricultural pesticide use in each United States county. This report presents the methods used to quantify agricultural pesticide use in drainage basins using a GIS and includes the estimates of atrazine use applied to row crops, small-grain crops, and fallow lands in 150 watersheds in the conterminous United States. Basin atrazine use estimates are presented to compare and analyze the results that were derived from 30-meter and 1-kilometer resolution land cover and county pesticide use data, and drainage basin boundaries at various grid cell resolutions. Comparisons of the basin atrazine use estimates derived from watershed boundaries, county pesticide use, and land cover data sets at different resolutions, indicated that overall differences were minor. The largest potential for differences in basin pesticide use estimates between those derived from the 30-meter and 1-kilometer resolution enhanced National Land Cover Data 1992 exists wherever there are abrupt agricultural land cover changes along the basin divide. Despite the limitations of the drainage basin pesticide use data described in this report, the basin estimates provide consistent and comparable indicators of agricultural pesticide application in surface-water drainage basins studied in the NAWQA Program.
Estimation of Agricultural Pesticide Use in Drainage Basins Using Land Cover Maps and County Pesticide Data
Author:
Publisher: DIANE Publishing
ISBN: 1428906347
Category :
Languages : en
Pages : 56
Book Description
Publisher: DIANE Publishing
ISBN: 1428906347
Category :
Languages : en
Pages : 56
Book Description
Estimation of Agricultural Pesticide Use in Drainage Basins Using Land Cover Maps and County Pesticide Data
Author: Naomi Nakagaki
Publisher:
ISBN:
Category : Atrazine
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category : Atrazine
Languages : en
Pages :
Book Description
Water-resources Investigations Report
Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 766
Book Description
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 766
Book Description
Pesticides in Streams of the United States
Author: Steven J. Larson
Publisher:
ISBN:
Category : Pesticides
Languages : en
Pages : 102
Book Description
Publisher:
ISBN:
Category : Pesticides
Languages : en
Pages : 102
Book Description
Nutrients in Streams and Rivers Across the Nation -- 1992-2001
Author: David K. Mueller
Publisher:
ISBN:
Category : Nutrient pollution of water
Languages : en
Pages : 56
Book Description
Publisher:
ISBN:
Category : Nutrient pollution of water
Languages : en
Pages : 56
Book Description
Mercury in Fish, Bed Sediment, and Water from Streams Across the United States, 1998-2005
Author: Barbara C. Scudder
Publisher: DIANE Publishing
ISBN: 1437921132
Category : Science
Languages : en
Pages : 86
Book Description
Report on how mercury (Hg) was examined in top-predator fish, bed sediment, and water from streams that spanned regional and national gradients of Hg source strength and other factors thought to influence methylmercury bioaccum. Sampled settings include stream basins that were agr¿l, urbanized, undeveloped, and mined. Predator fish were targeted for collection, and composited samples of fish were analyzed for total Hg (THg), as most of the Hg found in fish tissue is MeHg. Samples of bed sediment and stream water were analyzed for THg, MeHg, and characteristics thought to affect Hg methylation, such as loss-on-ignition and acid-volatile sulfide in bed sediment, and pH, dissolved organic carbon, and dissolved sulfate in water. Illus.
Publisher: DIANE Publishing
ISBN: 1437921132
Category : Science
Languages : en
Pages : 86
Book Description
Report on how mercury (Hg) was examined in top-predator fish, bed sediment, and water from streams that spanned regional and national gradients of Hg source strength and other factors thought to influence methylmercury bioaccum. Sampled settings include stream basins that were agr¿l, urbanized, undeveloped, and mined. Predator fish were targeted for collection, and composited samples of fish were analyzed for total Hg (THg), as most of the Hg found in fish tissue is MeHg. Samples of bed sediment and stream water were analyzed for THg, MeHg, and characteristics thought to affect Hg methylation, such as loss-on-ignition and acid-volatile sulfide in bed sediment, and pH, dissolved organic carbon, and dissolved sulfate in water. Illus.
Mercury in Fish, Bed Sediment, and Water from Streams Across the United States, 1998-2005
Author:
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 88
Book Description
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 88
Book Description
Hearing to Consider Reducing the Regulatory Burdens Posed by the Case, National Cotton Council V. EPA (6th Cir. 2009) and to Review Related Draft Legislation
Author: United States. Congress. House. Committee on Agriculture. Subcommittee on Nutrition and Horticulture
Publisher:
ISBN:
Category : Law
Languages : en
Pages : 272
Book Description
Publisher:
ISBN:
Category : Law
Languages : en
Pages : 272
Book Description
M. l'abbé Henri Chaumont
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description