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• Data Sources
• Methods
• Assumptions
• Limitations
• References

Data sources

Animals and crops:

The animal and crop production data used in these budgets are those reported in the U.S. Census of Agriculture.

Census data sources are listed below by year:

• 1939: U.S. Dept. of Commerce, 1943
• 1949: U.S. Dept. of Commerce, 1952
• 1964: U.S. Dept. of Commerce, 1967
• 1978: U.S. Dept. of Commerce, 1981
• 1982: U.S. Dept. of Commerce, 1984
• 1987: U.S. Dept. of Commerce, 1987
• 1992: U.S. Dept. of Commerce, 1994
• 1997: U.S. Dept. of Agriculture, 1999
• 2002: U.S. Dept. of Agriculture, 2004
• 2007: U.S. Dept. of Agriculture, 2009

Manure P production rates and crop P removal rates for each type of animal and crop are included in the following tables:

• Manure coefficients
• Crop coefficients

Additional information:

Methods: Manure Crops
Assumptions: Manure Crops

Fertilizer:

Data used to estimate fertilizer use are taken from a variety of state and national fertilizer sales reports and from the U.S. Census of Agriculture.

These data sources are listed below by state and then by year:

Pennsylvania:

• 1939 and 1949:
  • State-level fertilizer phosphate tonnage
    • Mehring et al., 1940
    • USDA, 1966
  • County-level total fertilizer tonnage
    • National Fertilizer Association, 1942
    • U.S. Dept. of Commerce, 1956
• 1964-2007:
  • County-level fertilizer phosphate tonnage
    • Pennsylvania Dept. of Agriculture, 1964, 1979, 1982, 1987, 1992, 1997, 2002, and 2007.

Delaware:

• 1939-1982:
  • State-level fertilizer phosphate tonnage
    • Mehring et al., 1940, USDA, 1964, 1978, and 1982
• 1987-2007:
  • County-level fertilizer phosphate tonnage
    • Terry and Kirby, 1988, 1992, 1997, 2002, and 2007.

Maryland:

• 1939-1982:
  • State-level fertilizer phosphate tonnage
    • Mehring et al., 1940, USDA, 1964, 1978, and 1982
• 1987-2007:
  • County-level fertilizer phosphate tonnage
    • Terry and Kirby, 1988, 1992, 1997, 2002, and 2007

Virginia:

• 1987-2007:
  • County-level fertilizer phosphate tonnage
    • Terry and Kirby, 1988, 1992, 1997, 2002, and 2007

West Virginia:

• 1978-1982:
  • State-level fertilizer phosphate tonnage
    • USDA, 1978
    • USDA, 1982
• 1987-2007:
  • County-level fertilizer phosphate tonnage
    • Terry and Kirby, 1988, 1992, 1997, 2002, and 2007

Additional information:

Fertilizer methods
Fertilizer assumptions