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Summary

This dataset provides county-level data for Nitrogen fertilizer
applied to county croplands [1000 kg N/yr]. This includes only those
crops used in an assessment of greenhouse gas production from US
agriculture using the DNDC agro-ecosystem model [see, for example, Li
et al. (1992), J. Geophys. Res., 97:9759-9776; Li et al. (1996) Global
Biogeochem. ... Cycles, 10:297-306]. Cropland area statistics are from the
National Agricultural Statistical Service (NASS) for 1990 for most
crops, though some are 1992 data from the Census of Agriculture. Data
represent total of irrigated and non-irrigated areas. (see NASS Crops
County Data).

This is based on 'typical' nitrogen fertilization rates for each of
the crops. The fertilizer application rates (see Table below) were
derived from USDA NASS state agricultural statistics bulletins [see
http://www.usda.gov/nass/sso-rpts.htm to locate state information].
Nitrogen fertilization rates for all leguminous crops were set to
zero.

Crop Typical' N Fert. Rate (kg N/ha)
Alfalfa 0
Barley 75
Corn (grain & silage) 125
Cotton 100
Edible Bean 0
Idle Cropland 0
Non-Legume Hay 25
Oats 75
Pasture 0
Peanut 0
Potatoes 250
Rice 140
Sorghum 75
Soybean 0
Spring Wheat 50
Sugarbeets 150
Sugarcane 200
Sunflower 100
Tobacco 100
Vegetables 100
Winter Wheat 75

County crop areas were multiplied by the nitrogen fertilization rates
given above to determine total N-fertilization of these croplands per
year. The 1990 national total N fertilizer use calculated by this
method (8.5 million tonnes N/yr) is 83% of the 1990 national
N-fertilizer sales (10.3 million tonnes N/yr). The sales total is
expected to be larger because it will include fertilizer sold for
other uses (eg. lawns, golf courses, other non-crop uses) as well as
farm-use fertilizer applied to crops not included in the crop database
(eg. vineyards, orchards, sod). The source for N fertilizer sales is
American Assoc. of Plant Food Control Officials, 103 Regulatory
Services Building; University of Kentucky; Lexington, KY 40546-0275;
Phone (606)257-2668 fax (606)257-7351. A second source for this data,
in GIS format, is [http://h2o.usgs.gov/public/pubs/bat/bat000.html].


EOS-WEBSTER provides seven datasets which provide county-level data on
agricultural management, crop production, livestock, soil properties,
geography and population. These datasets were assembled during the
mid-1990's to provide driving variables for an assessment of
greenhouse gas production from US agriculture using the DNDC
agro-ecosystem model [see, for example, Li et al. (1992),
J. Geophys. Res., 97:9759-9776; Li et al. (1996) Global
Biogeochem. Cycles, 10:297-306]. The data (except nitrogen fertilizer
use) were all derived from publicly available, national
databases. Each dataset has a separate DIF.

The US County data has been divided into seven datasets.

US County Data Datasets:

1) Agricultural Management
2) Crop Data (NASS Crop data)
3) Crop Summary (NASS Crop data)
4) Geography and Population
5) Land Use
6) Livestock Populations
7) Soil Properties

Related URL

Link: VIEW PROJECT HOME PAGE Description: EOS-WEBSTER Earth Science Information Partner (ESIP) provides terrestrial ecosystem research data via a web-based search, subset and order system.

Geographic Coverage Spatial coordinates   

N: 50.0

S: 26.0

E: -66.0

W: -124.0

Temporal Coverage

Start Date: 1990-01-01 Stop Date: 1990-12-31

Location Keywords

CONTINENT > NORTH AMERICA CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA

Science Keywords

AGRICULTURE > AGRICULTURAL CHEMICALS > FERTILIZERS > 1990 FERTILIZER APPLIED TO CROPLANDS (1000 KG N/YR)

ISO Topic Category

FARMING

Project

ESIP > Earth Science Information Partners Program

Ancillary Keywords

CROPLAND CROPS FERTILIZATION NITROGEN

Data Center

EOS-WEBSTER, Complex Systems Research Center, Institute for the Study of Earth, Oceans, and Space, Univ. of New Hampshire Data Center URL: http://eos-webster.sr.unh.edu Data Center Personnel Name: DENISE BLAHA Phone: 1-603-862-3785 Fax: 603-862-0188 Email: support at cooa.sr.unh.edu Contact Address: Complex Systems Research Center Institute for the Study of Earth, Oceans, and Space Morse Hall University of New Hampshire City: Durham Province or State: New Hampshire Postal Code: 03824 Country: USA

Personnel

SHANNON SPENCER Role: DIF AUTHOR Phone: 603-862-1792 Fax: 603-862-0188 Email: shannon.spencer at unh.edu Contact Address: Complex Systems Research Center Institute for the Study of Earth, Oceans, and Space Morse Hall University of New Hampshire City: Durham Province or State: New Hampshire Postal Code: 03824 Country: USA

Publications/References
Li et al. (1992), J. Geophys. Res., 97:9759-9776;
Li et al. (1996), Global Biogeochem. Cycles, 10:297-306

Creation and Review Dates

DIF Creation Date: 2000-07-25 Last DIF Revision Date: 2007-02-15

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