NAWQA GIS ancillary data: Nitrogen contributions from fertilizer and manure for 500-m buffers around sampling sites

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Hitt, Kerie J.

Publication_Date: 20081125

Edition: 1

Title:

NAWQA GIS ancillary data: Nitrogen contributions from fertilizer and manure for 500-m buffers around sampling sites

Online_Linkage: <URL:http://water.usgs.gov/nawqa-only/gw.html>

Description:

Abstract:

This data set consists of annual nitrogen inputs from fertilizer (1987-2001) and manure (1982, 1987, 1992 and 1997) for 500-m buffers around NAWQA sampling sites. The source of the fertilizer data is the county fertilizer data set developed by Nutrients National Synthesis (Dubrovsky, Spahr, and Gronberg, written communication, October 21, 2008) to correct issues in the county fertilizer data set published in Ruddy and others (2006). The source of the county manure data remains Ruddy and others (2006). The only change to the manure data was the addition of data previously missing for wells in one network (gaflsus4).

Purpose:

This is one of the ancillary GIS data layers developed to characterize environmental settings of NAWQA ground water studies for national synthesis of water-quality data.

Supplemental_Information:

BACKGROUND REGARDING COUNTY-LEVEL FERTILIZER NUTRIENT INPUT DATA
County-level fertilizer nutrient inputs for 1987-2001 were previously estimated from Association of American Plant Food Control Officials (AAPFCO) sales data by Ruddy and others (2006). Historically, several methods have been used to estimate county-level values, but Ruddy was the first to further distinguish between the farm and nonfarm portions. Key to this is the extrapolation of information because the farm and nonfarm sales data do not exist for all States. Ruddy and others (2006) developed a procedure to estimate nonfarm-fertilizer sales for all States, by calculating national totals of farm and nonfarm sales and converting these to proportions. These proportions were applied to the annual sales of each fertilizer product to estimate farm and nonfarm sales within each State. Subsequent analysis of the estimates and the programs used to produce the estimates revealed that allocation of fertilizer to farm and nonfarm portions was not calculated as described in the Ruddy report. Instead of selecting only states that reported nonfarm sales for at least 11 products to calculate the national farm and nonfarm proportions of each fertilizer product, ALL states were used. Using all states in the calculation inflated the farm tonnage and therefore the nonfarm proportion was lower than it should have been.
As a result of this discovery, the method used in SIR 2006-5012 to process the data was re-evaluated in 2008. This included an analysis of the AAPFCO fertilizer sales data to develop a better understanding of the information available. The result of this review was a revised method for estimating nonfarm fertilizer sales designed to exclude to the extent possible the use of state-level estimates and inconsistent or erroneous values.
The county-level fertilizer estimates revised in October 2008 were apportioned by county and agricultural land use within ground water buffers.
COMPUTING FERTILIZER AND MANURE NITROGEN INPUTS REPRESENTING CYCLE 1 OF NAWQA
Nutrients National Synthesis represents nitrogen nutrient inputs for cycle 1 by averaging the individual annual values over the years bracketing the years of sampling.
For FERTILIZER, Nutrients National Synthesis in most cases is representing cycle 1 NAWQA nitrogen load per well buffer as:

FY 91 studies - average of 92, 93, 94, 95 fertilizer values for the buffer
FY 94 studies - average of 95, 96, 97, 98 fertilizer values for the buffer
FY 97 studies - average of 98, 99, 00, 01 fertilizer values for the buffer

Here is an example of how we would calculate cycle 1 nitrogen input for farm fertilizer for a well in a FY 94 study in most cases:

FARMN92         =   18,087
FARMN93         =   17,342
FARMN94         =   16,128
FARMN95         =   15,278
FARMN96         =   15,153
FARMN97         =   14,697
FARMN98         =   14,081
FARMN99         =   15,974
FARMN00         =   16,948
FARMN01         =   14,972

FARMNAVG        =   FARMN95 + FARMN96 + FARMN97 + FARMN98 / 4
                =   14,802.196

After the October 2008 version of the county-level fertilizer nutrient inputs was developed, the Nutrients Synthesis team identified more issues with the estimates for farm or nonfarm fertilizer for certain states in certain years (Norm Spahr, written communication, October 29, 2008). For use in ground water models, for a few study units, we decided to screen out these years of questionable data when we average the values for cycle 1.
For MANURE, Nutrients National Synthesis is representing cycle 1 NAWQA nitrogen load per well buffer as:

FY 91 studies - average of 92 and 97 manure values for the buffer
FY 94 studies - 97 manure values
FY 97 studies - 97 manure values

For ATMOSPHERIC DEPOSITION, Nutrients National Synthesis is representing cycle 1 NAWQA nitrogen load per well buffer as:

FY 91 studies - average of 92, 93, 94, 95 atmospheric
                deposition values for the buffer
FY 94 studies - average of 95, 96, 97, 98
FY 97 studies - average of 98, 99, 00, 01

(The annual atmospheric deposition estimates for the ground water buffers are available in a separate data set.)
The cycle 1 nutrients inputs from nitrogen calculated using the above approaches are available by request.
OTHER BACKGROUND INFORMATION
The nutrients input data set did not include Alaska and Hawaii.
Some sites fall outside the conterminous United States (all sites in COOK and OAHU, some sites in REDN and PUGT). These sites do not have any county assigned to them, and they have no nutrient data as well. (Values = -9999.)

Time_Period_of_Content:

Time_Period_Information:

Multiple_Dates/Times:

Single_Date/Time:

Calendar_Date: 1982

Single_Date/Time:

Calendar_Date: 2001

Currentness_Reference:

The data set is intended to represent conditions for the early 1990's to late 1990's.

Status:

Progress: Complete

Maintenance_and_Update_Frequency:

The data set is updated as needed to correct the input fertilizer or manure values.

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -125

East_Bounding_Coordinate: -66

North_Bounding_Coordinate: 50

South_Bounding_Coordinate: 24

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: Ground water

Theme_Keyword: Surface water

Theme_Keyword: Water quality

Theme_Keyword: Nutrients

Theme_Keyword: Nitrogen

Theme_Keyword: fertilizer and manure

Access_Constraints: The data set is for internal USGS access only.

Use_Constraints: The data set is for internal USGS use only.

Data_Quality_Information:

Logical_Consistency_Report: none

Completeness_Report: none

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Neil Dubrovsky

Originator: Norm Spahr

Originator: Jo Ann Gronberg

Publication_Date: 20081021

Title:

County-level estimates of farm and nonfarm fertilizer inputs to the land surface of the conterminous United States, 1987-2001

Type_of_Source_Media: digital files

Source_Time_Period_of_Content:

Time_Period_Information:

Multiple_Dates/Times:

Single_Date/Time:

Calendar_Date: 1987

Single_Date/Time:

Calendar_Date: 2001

Source_Currentness_Reference: Ground condition

Source_Citation_Abbreviation: FERTREV08

Source_Contribution:

This data source contributed total (kilograms) nitrogen inputs from fertilizer by county for years 1987-2001. These county nitrogen inputs were apportioned by county and NLCDe 92 land use within the well buffers.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Barbara Ruddy

Originator: David Lorenz

Originator: David Mueller

Publication_Date: 2006

Title:

County-level estimates of nutrient inputs to the land surface of the conterminous United States, 1982-2001

Series_Information:

Series_Name: U.S. Geological Survey Scientific Investigations Report

Issue_Identification: 2006-5012

Publication_Information:

Publication_Place: Reston, VA

Publisher: USGS

Online_Linkage: <http://pubs.usgs.gov/sir/2006/5012/>

Type_of_Source_Media: digital files

Source_Time_Period_of_Content:

Time_Period_Information:

Multiple_Dates/Times:

Single_Date/Time:

Calendar_Date: 1982

Single_Date/Time:

Calendar_Date: 2001

Source_Currentness_Reference: Ground condition

Source_Citation_Abbreviation: SIR 2006-5012

Source_Contribution:

This data source contributed total (kilograms) nitrogen inputs from animal manure by county for years 1982, 1987, 1992, 1997. These county nitrogen inputs were apportioned by county and NLCDe 92 land use within the well buffers.
The fertilizer data from SIR 2006-5012 was not used. Instead, the fertilizer data were replaced by data developed by Dubrovsky, Spahr, and Gronberg (written communication, October 21, 2008).

Source_Information:

Source_Citation:

Citation_Information:

Originator: Curtis Price

Originator: Harold House

Publication_Date: 20051101

Title: NAWQA sampling points (NAWQAPT)

Edition: November 2005

Geospatial_Data_Presentation_Form: vector digital data

Type_of_Source_Media: digital files

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20051105

Source_Currentness_Reference: current

Source_Citation_Abbreviation: NAWQAPT

Source_Contribution:

The location of all of the NAWQA sampling sites as of publication date.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Curtis Price

Originator: Harold House

Publication_Date: 20051223

Title: NAWQA sampling points (NAWQAPT)

Edition: December 2005

Geospatial_Data_Presentation_Form: vector digital data

Type_of_Source_Media: digital files

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20051223

Source_Currentness_Reference: current

Source_Citation_Abbreviation: NAWQAPT

Source_Contribution:

The location of gaflsus4 sampling sites that were added since November 2005.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Naomi Nakagaki

Originator: Curtis V. Price

Originator: James A. Falcone

Originator: Kerie J. Hitt

Originator: Barbara C. Ruddy

Publication_Date: 200711

Title: Enhanced National Land Cover Data 1992 (NLCDe 92)

Edition: 1.0, 2005

Geospatial_Data_Presentation_Form: raster digital data

Publication_Information:

Publication_Place: Sacramento, CA

Publisher: U.S. Geological Survey

Online_Linkage: <http://water.usgs.gov/lookup/getspatial?nlcde92>

Type_of_Source_Media: digital files

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1986

Ending_Date: 1995

Source_Currentness_Reference: Publication date

Source_Citation_Abbreviation: NLCDe 92

Source_Contribution:

This source provided a 30-m resolution grid of land cover representative of the 1990s. NLCDe 92 was used to apportion county estimates of nitrogen inputs from fertilizer and manure to agricultural land to the counties within the well buffers.
NLCDe 92 is the nationally-consistent source of mapped land cover used by the USGS National Water-Quality Assessment Program to analyze data collected during the first decade of sampling from 1991-2001. NLCDe 92 has a 25-category land-cover classification scheme and is available as 30-meter resolution raster data. The NLCDe 92 was clipped to the U.S. boundary and shoreline.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Jo Ann Gronberg

Publication_Date: 20050907

Title:

GRID CO1990G -- 30-meter resolution grid of 1990 county boundaries

Type_of_Source_Media: digital files

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2005

Source_Currentness_Reference: Publication date of county boundary data

Source_Citation_Abbreviation: CO1990g

Source_Contribution:

This source contributed a 30-m resolution grid of county boundaries and FIPS codes, generated from a 100K county polygon coverage (COUNTY100) with medium resolution shoreline from the National Oceanic and Atmospheric Administration (NOAA). The county grid was used to apportion county estimates of nitrogen inputs from fertilizer and manure to NLCDe 92 agricultural land use for the counties within the well buffers.

Process_Step:

Process_Date: 20040805

Process_Description:

The basic procedure was to create a 500-m radius circular buffer around each NAWQA sampling site, then calculate a weighted average for the buffer for nitrogen from fertilizer and manure. Data processing occurs at 30 meters resolution.
The grid representing the 500-m buffer around the site was created using GRID SELECTCIRCLE. The location of each site in NAWQAPT (xcoord and ycoord) forms the center of the buffer.
The average nitrogen input was determined for each ground water buffer by overlaying the buffer with counties and NLCDe 92 land use to create a set of county/land use weighting factors. The weighting factors show which counties and NLCDe 92 categories comprise the buffer and what fraction of the buffer each county/land use combination covers. The weighting factors are used to compute weighted averages for the nitrogen from fertilizer and manure. This avoids doing multiple overlays of the buffer, counties, and land use.
Here is an example of the county/land use weight table for STAID 293615098262301 showing the confined and unconfined manure weighting factors.
Confined animal manure is applied to NLCDe 92 classes 81, 82, 83, 84. Unconfined animal manure is applied to NLCDe 92 classes 71, 81, 82, 83, 84.

GWBUF_FIPSLU.AWT

FIPS NLCDE    AREAKM2    AREAF     COUNTY_KM2   COUNTY_F  MANURE_CONF MANURE_CONF_KM2  MANURE_UCONF MANURE_UCONF_KM2
48029  11   0.00450000   0.00573395  3254.9   0.00000138   0.00000000     0.00000000   0.00000000      0.00000000
48029  22   0.06750000   0.08600917  3254.9   0.00002074   0.00000000     0.00000000   0.00000000      0.00000000
48029  23   0.07110000   0.09059633  3254.9   0.00002184   0.00000000     0.00000000   0.00000000      0.00000000
48029  31   0.00450000   0.00573395  3254.9   0.00000138   0.00000000     0.00000000   0.00000000      0.00000000
48029  41   0.17550000   0.22362390  3254.9   0.00005392   0.00000000     0.00000000   0.00000000      0.00000000
48029  42   0.35550000   0.45298170  3254.9   0.00010922   0.00000000     0.00000000   0.00000000      0.00000000
48029  51   0.01080000   0.01376147  3254.9   0.00000332   0.00000000     0.00000000   0.00000000      0.00000000
48029  71   0.05130000   0.06536698  3254.9   0.00001576   0.00000000     0.00000000   0.00004887   1049.76800000
48029  81   0.02340000   0.02981651  3254.9   0.00000719   0.00002822   829.24290000   0.00002229   1049.76800000
48029  83   0.02070000   0.02637615  3254.9   0.00000636   0.00002496   829.24290000   0.00001972   1049.76800000
FIPS is the county code. One county occurs in this particular buffer
NLCDE is the NLCDe 92 land use code.
AREAKM2 is the square kilometers of each county/land use combination in the
 buffer (Total AREAKM2 for a buffer should be about .785714).
AREAF is the fraction of the buffer represented by each
 county/land use combination. (AREAF = AREAKM2/total AREAKM2 for buffer)
COUNTY_KM2 is the total square kilometers of a county.
COUNTY_F is the fraction of the county represented by each county/land use
 combination.  (COUNTY_F = AREAKM2/COUNTY_KM2)

MANURE_CONF_KM2 is the total square kilometers of [pasture/hay +
 row crops + small grains + fallow] in the county.
MANURE_CONF is the fraction of the county [pasture/hay +
 row crops + small grains + fallow] represented by county [pasture/hay +
 row crops + small grains + fallow] in the GW buffer.
 (MANURE_CONF = AREA_KM2/MANURE_CONF_KM2).
 Applies only to land use categories 81, 82, 83, 84.

MANURE_UCONF_KM2 is the total square kilometers of [grasslands + pasture/hay +
 row crops + small grains + fallow] in the county.
MANURE_UCONF is the fraction of the county [grasslands + pasture/hay +
 row crops + small grains + fallow] represented by county [grasslands + pasture/hay +
 row crops + small grains + fallow] in the GW buffer.
 (MANURE_UCONF = AREA_KM2/MANURE_UCONF_KM2).
 Applies only to land use categories 71, 81, 82, 83, 84.

The manure nutrients data compiled for county 48029 are:

MAN82-97.DAT

NMAN92CONF      =  242124 kg
NMAN92UCONF     = 2504611 kg
NMAN97CONF      =  220371 kg
NMAN97UCONF     = 2533640 kg

To obtain 1992 nitrogen from manure from confined animals for the buffer, multiply the total confined manure for the county by each confined land use fraction in the well buffer:

               CONF N    fraction     CONF N     fraction
               for       of           for        of
               county    NLCDE 81     county     NLCDE 82
                         in buffer               in buffer
NMAN92CONF =  (242124 * .00002822) +  (242124 * .00002496) =  13 kg

To obtain 1992 nitrogen from manure from unconfined animals for the buffer, multiply the total unconfined manure for the county by each unconfined land use fraction in the well buffer:

               UCONF N    fraction     UCONF N    fraction     UCONF N     fraction
               for        of           for        of           for         of
               county     NLCDE 71     county     NLCDE 81     county      NLCDE 82
                          in buffer               in buffer                in buffer
NMAN92UCONF = (2504611 * .00004887) + (2504611 * .00002229) +  (2504611 *  .00001972) =  228 kg

Here is an example of the county/land use weight table for STAID 293252098380801 showing the farm and non-farm fertilizer weighting factors.
Farm fertilizer is applied to NLCDe 92 classes 61, 62, 81, 82, 83, 84 (ALLAG6). Non-farm fertilizer is applied to NLCDe 92 classes 21, 25, 26, 85.

GWBUF_FIPSLU.AWT

FIPS  NLCDE    AREAKM2        ALLAG6_KM2     ALLAG6        NONF_KM2      NONF
48029   11     0.00090000     0.00000000  0.00000000     0.00000000   0.00000000
48029   21     0.19890000     0.00000000  0.00000000   333.67320000   0.00059609
48029   22     0.04230000     0.00000000  0.00000000     0.00000000   0.00000000
48029   23     0.12600000     0.00000000  0.00000000     0.00000000   0.00000000
48029   41     0.09000000     0.00000000  0.00000000     0.00000000   0.00000000
48029   42     0.25560000     0.00000000  0.00000000     0.00000000   0.00000000
48029   51     0.03510000     0.00000000  0.00000000     0.00000000   0.00000000
48029   71     0.00720000     0.00000000  0.00000000     0.00000000   0.00000000
48029   81     0.00090000   829.81080000  0.00000108     0.00000000   0.00000000
48029   83     0.01620000   829.81080000  0.00001952     0.00000000   0.00000000
48029   85     0.00990000     0.00000000  0.00000000   333.67320000   0.00002967
ALLAG6_KM2 is the total square kilometers of [orchards vineyards +
 revised orchard vineyards + row crops + small grains + pasture/hay + fallow]
 in the county.
ALLAG6 is the fraction of the county [orchards vineyards +
 revised orchard vineyards + row crops + small grains + pasture/hay + fallow]
 represented by county [orchards vineyards + revised orchard vineyards +
 row crops + small grains + pasture/hay + fallow] in the GW buffer.
 (ALLAG6 = AREA_KM2/ALLAG6_KM2).
 Applies only to land use categories 61, 62, 81, 82, 83, 84.

NONF_KM2 is the total square kilometers of [low-intensity residential +
 residential without trees + residential with trees + urban grasses] in the county.
NONF is the fraction of the county [low-intensity residential +
 residential without trees + residential with trees + urban grasses]
 represented by county [low-intensity residential +
 residential without trees + residential with trees + urban grasses]
 in the GW buffer.
 (NONF = AREA_KM2/NONF_KM2).
 Applies only to land use categories 21, 25, 26, 85.

The fertilizer nutrients compiled for county 48029 are:

ALLN87-01.DAT
FARMN1992       = 3029739 kg
NONFN1992       = 1810226 kg

To obtain 1992 nitrogen from farm fertilizer for the buffer, multiply the total farm fertilizer for the county by each farm fertilizer land use fraction in the well buffer:

               FARM N    fraction       FARM N    fraction
               for       of             for       of
               county    NLCDE 81       county    NLCDE 83
                         in buffer                in buffer
FARMN92    =  (3029739 * 0.00000108) + (3029739 * 0.00001952) = 62 kg

To obtain 1992 nitrogen from nonfarm fertilizer for the buffer, multiply the total non-farm fertilizer for the county by each non-farm fertilizer land use fraction in the well buffer:

               NON-FARM N    fraction      NON-FARM N    fraction
               for           of            for           of
               county        NLCDE 21      county        NLCDE 85
                             in buffer                   in buffer
NONFN92    =  (1810226    * 0.00059609) +  (1810226   *  0.00002967) = 1133 kg

Processing routines are from the NAWQA area characterization toolbox. (weightstats sum)

Process_Step:

Process_Date: 200511

Process_Description:

All sites in NAWQAPT version 11/01/2005 were processed using a) fertilizer and manure county input data (fall 2005 version) and b) county/land use weighting factors from November 2005. The weighting factors were based on 30-m NLCDe 92 and 1990 county grids (September 2005 version).
This data set included fertilizer data for gaflsus4 (locations were based on NAWQAPT version 12/23/2005), but was missing manure data for most of the wells in that network.

Process_Step:

Process_Date: 200810

Process_Description:

Fertilizer and manure estimates were regenerated for the same set of sites as 2005 because of revisions to the county-level fertilizer input data. Although the county-level manure nitrogen input data did not change, the buffer estimates were regenerated to fill in manure values that were missing for about 25 wells in gaflsus4.
Weighting factors used to apportion the fertilizer and manure county inputs were derived from NAWQA sampling sites in the November and December 2005 versions of NAWQAPT, the standard geospatial data set of NAWQA sampling site locations. (The locations depicted in the NAWQAPT spatial data sets are generated from the NAWQA Data Warehouse, which in turn is based on the National Water Information System or "NWIS.") Although the fertilizer data county estimates were revised in 2008, the kilograms were apportioned using weighting factors derived in November 2005, to be consistent with other cycle 1 data already processed and used in various components of the NAWQA Program.

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference:

The data set is referenced by AREAID, the station id of the NAWQA sampling site.

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

The data set is organized by AREAID (station id).
The nitrogen fertilizer and manure numbers represent weighted averages for the ground water buffer. Missing data is -9999.
The fields are:

AREAID    NAWQA station id

             FARM FERTILIZER
(Farm land = NLCDe 92 classes 61,62,81,82,83,84)
FARMN87      1987 nitrogen from fertilizer on farm land (kg)
FARMN88	    1988 nitrogen from fertilizer on farm land (kg)
FARMN89	    1989 nitrogen from fertilizer on farm land (kg)
FARMN90	    1980 nitrogen from fertilizer on farm land (kg)
FARMN91	    1991 nitrogen from fertilizer on farm land (kg)
FARMN92      1992 nitrogen from fertilizer on farm land (kg)
FARMN93	    1993 nitrogen from fertilizer on farm land (kg)
FARMN94	    1994 nitrogen from fertilizer on farm land (kg)
FARMN95	    1995 nitrogen from fertilizer on farm land (kg)
FARMN96	    1996 nitrogen from fertilizer on farm land (kg)
FARMN97	    1997 nitrogen from fertilizer on farm land (kg)
FARMN98	    1998 nitrogen from fertilizer on farm land (kg)
FARMN99	    1999 nitrogen from fertilizer on farm land (kg)
FARMN00	    2000 nitrogen from fertilizer on farm land (kg)
FARMN01	    2001 nitrogen from fertilizer on farm land (kg)

             NONFARM FERTILIZER
(Nonfarm land = NLCDe 92 classes 21,25,26,85)
NONFN87      1987 nitrogen from fertilizer on non-farm land (kg)
NONFN88      1988 nitrogen from fertilizer on non-farm land (kg)
NONFN89      1989 nitrogen from fertilizer on non-farm land (kg)
NONFN90      1990 nitrogen from fertilizer on non-farm land (kg)
NONFN91      1991 nitrogen from fertilizer on non-farm land (kg)
NONFN92      1992 nitrogen from fertilizer on non-farm land (kg)
NONFN93	    1993 nitrogen from fertilizer on non-farm land (kg)
NONFN94	    1994 nitrogen from fertilizer on non-farm land (kg)
NONFN95	    1995 nitrogen from fertilizer on non-farm land (kg)
NONFN96	    1996 nitrogen from fertilizer on non-farm land (kg)
NONFN97	    1997 nitrogen from fertilizer on non-farm land (kg)
NONFN98	    1998 nitrogen from fertilizer on non-farm land (kg)
NONFN99	    1999 nitrogen from fertilizer on non-farm land (kg)
NONFN00	    2000 nitrogen from fertilizer on non-farm land (kg)
NONFN01	    2001 nitrogen from fertilizer on non-farm land (kg)


             CONFINED MANURE
(NLCDe 92 classes 81,82,83,84)
NMAN82CONF   1982 nitrogen from manure from confined animals (kg)
NMAN87CONF   1987 nitrogen from manure from confined animals (kg)
NMAN92CONF   1992 nitrogen from manure from confined animals (kg)
NMAN97CONF   1997 nitrogen from manure from confined animals (kg)

             UNCONFINED MANURE
(NLCDe 92 classes 71,81,82,83,84)
NMAN82UCONF  1982 nitrogen from manure from unconfined animals (kg)
NMAN87UCONF  1987 nitrogen from manure from unconfined animals (kg)
NMAN92UCONF  1992 nitrogen from manure from unconfined animals (kg)
NMAN97UCONF  1997 nitrogen from manure from unconfined animals (kg)

Entity_and_Attribute_Detail_Citation: None

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Kerie Hitt

Contact_Organization: USGS NAWQA Nutrients National Synthesis

Contact_Address:

Address_Type: Mailing address

Address: 413 National Center

City: Reston

State_or_Province: VA

Postal_Code: 20192

Country: USA

Contact_Electronic_Mail_Address: kjhitt@usgs.gov

Contact_Voice_Telephone: 703 648-6854

Contact_Instructions: Contact via email

Distribution_Liability:

USGS assumes no liability for the use of this data set.

Metadata_Reference_Information:

Metadata_Date: 20081125

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Kerie Hitt

Contact_Organization: USGS NAWQA Nutrients National Synthesis

Contact_Address:

Address_Type: Mailing address

Address: 413 National Center

City: Reston

State_or_Province: VA

Postal_Code: 20192

Country: USA

Contact_Electronic_Mail_Address: kjhitt@usgs.gov

Contact_Voice_Telephone: 703 648-6854

Contact_Instructions: Contact via email

Metadata_Standard_Name: Content standards for digital geospatial metadata

Metadata_Standard_Version: FGDC-STD-001-1998