USDA Agricultural Outlook, September 2000 - Manure Management

Four articles from the USDA looking at Manure management and output problems; Future of national policies affecting animal operations, and Environmental regulation and location of hog production.
calendar icon 28 August 2000
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Livestock and poultry manure applied to farmland provides a valuable source of organic nutrients. On many operations, careful nutrient management, including use of manure, can reduce or eliminate the use of commercial fertilizers. But nitrogen and phosphorus from manure can cause quality problems when they enter water systems. Reducing flows of excess nutrients from the application of animal waste to cropland has become a growing challenge to confined animal operations.

Nitrogen is easily soluble and is transported in surface runoff, tile drainage, and water leaching through soil (AO May 2000). Phosphorus is only moderately soluble, and relative to nitrogen, not very mobile in soil. But sediment-adsorbed phosphorus can transport considerable amounts of phosphorus to surface waters through erosion, and the potential for dissolved phosphorus loss to surface and groundwater increases with buildup of phosphorus in the soil.

The opportunity to jointly manage animal waste and crop nutrients as part of a single operation has decreased with the trend toward fewer, larger, and more specialized animal production operations, which have inadequate land available for utilizing manure.

According to the 1997 Census of Agriculture, sales of confined animal species (feedlot beef cattle, dairy, swine, and poultry) totaled over $75.4 billion, more than 45 percent of total farm sales. Federal policies that affect the industry¹s manure management costs -- e.g., through the Clean Water Act (CWA) and farm legislation -- can have significant economic effects on the livestock and poultry sectors. In addition, a growing number of states are implementing regulations directed specifically at confined livestock and poultry operations (see article on page 20).

This article presents national and county-level estimates of numbers of animals and quantity of manure nitrogen produced on confined animal operations (feedlot beef, dairy, swine, and poultry), as well as farmland acreage available for nitrogen application. The estimates are a joint effort of three USDA agencies-the Economic Research Service (ERS), Natural Resources Conservation Service (NRCS), and National Agricultural Statistics Service (NASS).

The study examines national data on farms that could be regulated under the CWA as point-source discharge sites, and on farms that may be eligible for assistance under the Environmental Quality Incentives Program (EQIP) of the 1996 Farm Act. Estimates of manure production and of land available for application are based on data from the four most recent Censuses of Agriculture (1982, 1987, 1992, and 1997). The question addressed is: If a livestock or poultry operation applies its manure to the available farmland (cropland and pasture) under its control at an optimal rate to meet the nutrient needs of crops grown, how much excess nitrogen would require disposal?

If the operator controls adequate land for manure application, the focus of manure disposal should be on farm-level solutions. For producers who can gain access to land off their farms, manure disposal involves additional considerations such as timing of transfer and applications, liability for improper application, and transportation costs. Areas that have insufficient cropland for spreading manure at optimal rates will need other manure disposal strategies, with manure management costs depending on the manure management strategy employed and the extent of potential problems -
e.g., variable nutrient content in the manure, establishing markets for excess manure nutrients, and manure storage constraints that necessitate coordination of production flows and manure nutrient usage.


The number of farms with confined animals has declined dramatically and steadily from 435,000 farms in 1982 to 213,000 in 1997. The number of animals on these farms is measured based on an animal unit (AU), which allows multi-species comparisons relative to some specific standard -- e.g., 1,000 pounds of live animal weight. Using the 1000-pound definition in this analysis means an AU is equivalent to 1.14 head of feedlot beef, 0.74 dairy cow, 2.67 swine for breeding, 9.09 swine for slaughter, 250 laying hens and pullets greater than 3 months old, 455 broiler chickens or pullets less than 3 months old, 50 turkeys for breeding, or 67 turkeys for slaughter.

All the decline in numbers of confined animal farms occurred in the smallest size groups -- i.e., very small operations with fewer than 50 animal units (AU), and small operations with 50 to 300 AU. In contrast, the number of medium-size operations (300-999 AU) grew by 4,400 farms, and large farms (at least 1,000 AU) more than doubled to almost 4,000 farms. However, in 1997, medium-size farms accounted for only about 6 percent of all confined animal farms and large farms almost 2 percent, so that very small and small farms still dominate the number of confined animal farms by a wide margin.

At the same time that the number of confined animal farms was falling, the number of confined animal units rose 10 percent. On very small farms, AU¹s dropped 64 percent overall to 1.6 million, while on small farms, AU¹s fell 74 percent to 11.1 million. Meanwhile, AU¹s on medium-size farms grew by more than half-from 4 million to 6.4--and almost doubled on large farms to reach 14.5 million.

Average AU per farm increased 6-17 percent for the lower three size classes between 1982 and 1997, but dropped 10 percent -- from 4,019 AU, on average, to 3,643 AU-for large confined animal operations. Large swine feeding operations proliferated during the period, and large swine operations generally have fewer AU than other types of confined animal operations. Quantities of nutrients produced by confined AU¹s rose about 20 percent in 1982-97, while acreage on livestock and poultry farms declined. The result is a 20-percent increase in estimated excess manure nutrients during a 15-year period, because of inadequate cropland for utilizing manure on the producing farms. For example, confined animals produced an estimated 1.23 million tons of recoverable manure nitrogen (collectible for spreading) in 1997, but 73 million acres of cropland and permanent pasture controlled by operators of confined livestock and poultry operations is estimated to have assimilative capacity for only 38 percent of the calculated nitrogen available. This is one reason for increased policy attention focused on confined livestock operations.

Inability to assimilate all manure nutrients produced on the farm occurs on operations of all sizes, but not equally. In 1997, about 15 percent of very small farms and 72 percent of large operations had inadequate capacity to utilize all the nitrogen produced onfarm. Very small farms produce only about 2 percent of the national total of excess nutrients, while small farms (50-299 AU) produced more recoverable manure nitrogen than any other size class-almost 500,000 tons -- and about 30 percent of total excess nitrogen, primarily accounted for by poultry production.

Nutrient production from medium- and large-size confined animal operations increased significantly during 1982-97, and quantities of total recoverable manure nitrogen and excess nitrogen almost doubled. Recoverable manure nitrogen production on medium-size operations increased 68 percent, and excess nitrogen by 83 percent; on large farms the corresponding increases were 102 percent and 104 percent. Medium-size farms accounted for 6 percent of confined animal operations but for 20 percent of 1997 excess nitrogen from confined animal production, while large farms accounted for 2 percent of confined animal farms and almost half of excess nitrogen.

Farms subject to regulation under current CWA rules are designated concentrated animal feeding operations (CAFO¹s) based on number of animal units and amount of point-source discharge from the operation. CAFO¹s are not directly identified in Census of Agriculture data. Because the regulatory impact of the CWA on CAFO¹s is of interest to policymakers, ERS has constructed a category of farms -- "potential" CAFO¹s -- that would likely be considered CAFO¹s under EPA rules. Farms are designated as potential CAFO¹s from estimates of annual average numbers of animals on the farms, derived from data on annual number of animals sold and year-end inventories. Potential CAFO¹s--5 percent of all confined animal farms -- include all farms in the large-size category and most in the medium-size. Potential CAFO¹s more than doubled from 1982 to 1997, increasing from about 5,000 farms to 11,200, while the number of AU¹s on these farms increased from 9.1 million (30 percent of total confined AU¹s) to 18 million (54 percent of total confined AU¹s). Nationally, the average number of AU¹s on each potential CAFO has remained stable, so the gain in AU¹s on potential CAFO farms was due simply to the increase in number of potential CAFO¹s. Potential CAFO¹s could be the source of over half of estimated excess nitrogen from all confined animal operations.


Environmental regulation, and the added costs generally associated with compliance, are considerations often factored into the choice of a business location. It has been hypothesized that geographic variation in environmental regulations and enforcement can induce a migration of industries across state or country boundaries to "pollution havens" where compliance costs associated with environmental regulations are lower.

Analysis of how environmental regulation and enforcement at the state and county level (instead of at the Federal level) have affected location decisions by industrial agriculture can provide some insight into whether the pollution haven phenomenon applies to agriculture. In addition, it may help explain why efforts to regain some national control of the regulatory process by implementing national standards have engendered negative reactions. For example, local pressures could cause Congress to balk at appropriating funds for enforcement if the U.S. Environmental Protection Agency (EPA) tightens existing Federal water quality laws through regulations proposed for confined animal feeding operations.

Study of whether environmental regulation causes agricultural businesses to relocate may also shed some light on effects of environmental regulation in the international arena. Proposals to harmonize (reconcile) environmental standards across international boundaries add to the urgency of the question because of concerns raised that trade liberalization could induce increased investment in agricultural production in countries with lower environmental standards.

Two emerging issues addressed by USDA¹s Economic Research Service (ERS) are: 1) the relationship between stringency of regulation and location of animal production, and 2) environmental implications of confined animal production (see article on page 13). This article discusses some of the reasons for heightened interest in the links between stringency of environmental regulation and location of the U.S. swine industry. ERS analyzes the impacts of environmental regulation on the location of animal production using information from studies presented at an ERS-Farm Foundation workshop on industry location analysis, as well as extensive review of recently published analyses.

Hog Industry Relocation & Concentration

Regulations to protect the environment have historically addressed concerns about environmental pollution from identifiable "point" sources in the manufacturing sector. But advances in understanding the potentially damaging effects of pollutants in runoff from agricultural production sites -- i.e., point- and nonpoint-source pollution -- have led to efforts to extend environmental regulation to agricultural activities as well.

A report by the EPA published in the Federal Register concludes that agriculture is the leading source of pollutants in assessed rivers and streams, contributing to 59 percent of reported water quality problems and affecting about 170,000 river miles of the assessed waterways. Unlike manufacturing, however, it is difficult to correlate damage to the environment with production activities at a specific farm or animal production operation. Nevertheless, concern about the environmental effects of agricultural production is becoming more widespread, exacerbated by the proliferation of large animal production facilities, particularly those concentrated in certain geographic areas.

Recently released data from the 1997 Census of Agriculture indicate the number of hog operations in the U.S. has decreased by half in 10 years, but total inventory has remained relatively constant as smaller operations exit and the average operation gets larger. Swine production is more mobile than other livestock sectors. Hogs can be transported more easily than other livestock, and are not tied to the land, as are cattle. Also, contract operations account for a large share of hog production, and when a contractor moves or expands into a new region, new contracts can be negotiated in the new location.

Hog production has expanded in recent years in areas in the South and in nontraditional areas of the West, and a number of counties that were only minimally involved in the hog industry as of 1992 now have significant numbers of hogs. This has prompted speculation that large operations moved to those areas because of possibly less stringent environmental regulations. Some high-profile environmental accidents have pointed to the risk potential of concentrated animal production. For example, the problem of leakage from large waste lagoons attracted public attention when millions of gallons of manure overflowed in North Carolina in the aftermath of Hurricane Floyd in 1999.

Implementation of environmental regulations can impose compliance costs on producers and reduce profits. Estimates from one study of hog producers in the U.S. and the European Union (EU) put U.S. waste management costs at $0.40 to $3.20 per hog, which represents 1-8 percent of total hog production costs for the operations studied, higher than in previous years because of added costs of regulatory compliance. Because of the stringency of the EU Nitrate Directive, estimated costs of compliance for hog operations there are higher than in the U.S., raising concerns about EU export competitiveness.

Producers may respond to existing or impending costs of regulation by exiting the industry or by changing the scale and/or location of production. Moving to a different state or country might mitigate or bypass the costs of local or domestic environmental regulations altogether, but adding new capacity at the same site might enable economies of scale that offset additional costs of compliance. However, responses that promote larger hog operations create potential for greater volumes of hog manure to adversely affect water quality in a local area.

State-level estimates in December 1999 indicate that 17 states account for the vast majority of very large hog and pig operations (inventory exceeding 5,000 head). North Carolina, Iowa, and Minnesota stand out in number of very large operations. Perhaps even more significantly, however, very large operations in Colorado, Oklahoma, and Texas, while much fewer in number, account for almost all hog production in those states.

EPA requires operations with an inventory of more than1,000 animal units to have National Pollution Discharge Elimination System (NPDES) permits for manure storage or to demonstrate that there is no runoff from the farm. (EPA defines 1,000 animal units for hogs as 2,500 head.). However, interpretation of the regulation varies from state to state, and many states pursue enforcement only in response to citizen complaints. According to EPA, a very small proportion of operations with more than 2,500 hogs had acquired the appropriate manure storage permits.

Type of ownership of hog producing and packing operations appears to play a role in the locational response to environmental regulation. Individual producers with family-owned operations are not likely to move operations to different locations as a result of regulatory changes. Instead, they are more likely to continue operating, perhaps at a different scale, or shut down the enterprise. In addition, as the hog industry moves toward more production under contract, contractees who grow hogs for larger operations may have limited ability to adapt if they incur additional costs from regulations and get no financial assistance from contractors. In the past, production contracts allowed for specific returns on the finished product, but have left the costs of manure management to the producer.

Most large corporate production companies already operate facilities in multiple states, easing the shift of production between states in response to changes in business conditions. For example, Purina has production facilities in seven states. Similarly, many top packers also operate multiple plants across states, so the economic benefits of clustering production and packing facilities together could be maintained even as production capacity shifts. Given advances in litter production technology (i.e., more litters per sow and more pigs per litter), businesses that own over 100,000 sows could produce 2 million pigs a year for slaughter, promising large potential savings on transportation costs from clustering facilities in fewer, more hospitable locations.

Analyses of business location decisions often focus on four factors: natural endowments, economic costs, business climate, and public policies (including environmental regulation). International location studies based on interviews with business executives have rated political stability, taxes, exchange rate convertibility, and repatriation of profits as key factors in foreign investment decisions. Environmental regulations were ranked much lower on the list of considerations.

Studies of the hog industry in particular indicate that significant variables (factors) in location decisions for hog farms are precipitation, existing percentage of large hog farms in the state, feed costs, and density of production. Evidence indicates that the recent shift in hog operations to western states (primarily Colorado, Oklahoma, and Texas) resulted in part from savings in transportation costs, because the move puts exportable products one day closer to the Japanese market compared with producers in the Midwest and South. In addition, the West offers a relatively disease-free environment for raising animals. Nevertheless, production shifts to these more sparsely populated regions highlights the relationship between location, concentration, and environmental impact.

As animal operations become larger, more states are looking at ways to protect environmental quality from excess animal waste. Large confined animal operations can present major problems at the local level. Part of the potential environmental impact lies in the assimilative capacity of soil and crops to prevent nitrogen and phosphorous from reaching local surface water and groundwater resources. The National Pollution Discharge Elimination System point-source permit system-part of the Clean Water Act-addresses on-site storage of manure, but not disposal.

Regulatory Stringency & Enforcement Vary

States¹ policies regulating nonpoint-source pollution may vary because of the design of Federal water policy laws, characteristics of the nonpoint-source pollution, and characteristics of the states that have to deal with water quality issues arising from animal confinement.

Federal water quality laws reflect both the nation¹s desire to address existing environmental problems, and the conviction that states should have sufficient authority and flexibility to design and implement their own environmental laws. States also have the option to provide funding for voluntary programs to address the environmental needs of local areas.

When the Clean Water Act was passed in 1972, point sources were seen as the primary culprits in water and air pollution, so the discharge permit program was designed to limit emissions by known polluters. Nonpoint-source pollution was considered a lesser problem that could be left to the states to manage. In fact, there is some benefit to relegating nonpoint-source pollution law to state or local level jurisdictions that are closer to the problem-e.g., more detailed knowledge of the problem and more sensitivity to impacts of the solution.

A possible drawback to locally developed policies is that local jurisdictions sometimes have insufficient resources to develop and enforce regulatory programs. In addition, regulations at a local level may not effectively address transboundary issues, which may lead to an increase in frequency of pollutant flows from one jurisdiction to another. If there is a solution to a transboundary issue, it often comes from the coordination of activities of local jurisdictions by a Federal government agency like the EPA.

Nonpoint-source pollution is characterized by difficulty in observing runoff and by natural variability of pollution flows with changes in weather, so linking observations of particular management practices associated with confined hog feeding operations to changes in water quality is problematic. And predicting how changes in management practices will affect water quality presents challenges.

Differences within states in farming practices, land forms, climate, and hydrologic characteristics is another complication in policy design. Variation in the environmental impact of agricultural production can occur even within relatively small geographic areas. Transboundary effects, uncertainty in measuring actual water quality damage, and time lags in the movement of a pollutant into a water system also factor into policy design. Forty-four states have passed laws or instituted programs that either protect water quality directly by curbing point-source pollution, or protect it indirectly by regulating an agricultural production practice associated with generation of nonpoint-source pollution. Some state laws are follow-ons to Federal clean water laws, while others respond to chronic local problems such as nitrates or pesticides in groundwater. To help improve water quality, states may institute controls on inputs or practices and land use, offer economic incentives, and provide for educational programs.

Difficulty in measuring the stringency of environmental regulations is a limitation for analysis of whether state environmental regulations affect the location or expansion decisions of hog producers. Environmental indices that rank states on level of environmental protection are of limited use for agricultural analysis, particularly indices that predate rapid growth in an industry like swine production. The components underlying the indices do not relate specifically to agricultural industries or to environmental problems spawned by concentration in livestock production. For example, one index assigns states to four categories of environmental protection -- environmentally progressive, struggler, delayer, or environmentally regressive -- in 1990 and 1994. While this ranking highlights the potential for states to move up or down in environmental protection, it does not take into account environmental problems that did not even exist a few years ago. Recent research has started improving these indexes.

Specificity can add stringency to regulation. For example, states may develop regulations specific to an industry to give more regulatory attention to a perceived problem. However, specific regulation can also reflect efforts to stave off even more stringent regulation -- known as a "no more stringent than" law. By enacting a legislative prohibition on future, more stringent, environmental regulations, states may be seeking to encourage facilities to locate there.

Regulations that include reporting requirements and that indicate some accountability for firms¹ actions have greater stringency than those that simply recommend best management practices. The number of permit bars or blocks that preclude violators from obtaining new permits until problems have been addressed is a better indicator of regulatory stringency than the number of penalties, since penalties may or may not be imposed for environmental infractions due to lack of enforcement capability or funding. Another indicator of stringency is sufficient resources and staff allocated to enforcement by state agencies. Rational enforcement agents should be optimizing some weighted function of their agency¹s political interests and the general social welfare. Level of enforcement may not significantly affect firms¹ locational response to regulatory restrictions if expected costs of noncompliance are less than expected costs of compliance. In fact, very few operations in any state have been penalized in the past, and the penalties were generally small compared with overall costs of the operation. Even with Federal laws like the Clean Water Act and the Clean Air Act, enforcement is normally delegated to state agencies. However, government agencies don¹t usually take on the task of regulation in advance of a problem, so regulation generally lags the appearance of environmental damage. Areas that develop the most stringent regulations will tend to be those that already have environmental problems, that have the most production with potential to cause environmental problems, or that have production close to population centers where citizens are concerned about potential problems.

No matter how stringent, sometimes state laws are ineffective because they are applied unevenly. For example, a study commissioned by the Indiana legislature reveals that many of the state¹s environmental regulations only apply to new operations, because older operations are "grandfathered in" -- i.e., not subject to the new rules. However, grandfathering may be politically necessary to get environmental legislation passed.

Does Environmental Regulation Influence Location?

Conjecture is that animal industries tend to move to areas with a lax environmental regulatory structure. Lax structure can mean either no effort to enforce, or lack of institutional capabilities or financial resources to enforce. It may also means an absence of perceived need for environmental regulation or enforcement. Locational shifts may involve moves between geographic areas, or clustering within a given area.

Clustering may occur in areas where existing climatic and geologic factors such as slope or rainfall make it less costly to comply with standardized regulations. For example, protecting a lagoon from overflowing is easier and is lower cost on land that is not a floodplain or where the distribution of rainfall is not problematic. Clustering has a cumulative effect in lowering costs, with processing facilities drawing in more production facilities that may in turn draw in more processing, allied agribusiness, and input suppliers.

Studies examined indicate that hog operations locate wherever they can function on a large scale and realize unit-cost savings. Compliance costs for environmental regulations were only a minor consideration in the past, but this could change with likely stricter future regulations governing larger producers. Mitigating environmental problems in areas of expanding hog production can nevertheless be consistent with profitable operations. Producers can lower compliance costs by altering practices. For example, modifying the cropping system can increase the capacity of farmland to absorb nitrates and phosphorous from manure, and feed supplementation with phytase reduces the amount of phosphorous excreted by hogs. Since much of the best technology for dealing with pollution from hogs is expensive, clustering many large operations in an area can make use of the technology more cost-effective. For example, a custom applicator for manure facilitates injecting manure into the soil locally rather than transporting it long distances. Joint ownership and use of such machines increases cost-effectiveness and reduces compliance costs for all.

One somewhat surprising finding is that stringent regulation -- which doesn¹t necessarily imply stringent enforcement -- may actually attract industries to states. Since specificity in regulations makes the rules clear for industries planning for future operations, the uncertainty of having to deal with regulations as they develop is reduced. However, the more a state spends on environmental enforcement, the less likely a given firm will locate in that state. Differences in level of enforcement among nearby states, especially if competitors already operate in the area, may also affect location decisions. For example, new operations might be disadvantaged if they incur costs not imposed on existing businesses.

Additional research is needed to estimate the potential impacts of new state and Federal water quality regulations on the animal production sector. For example, compliance costs for the Unified National Strategy for Animal Feeding Operations-an initiative announced by USDA and EPA-will be one subject for future research. Research in the future also will explore the relationship between type, size, and location of operation, and unit costs for compliance with particular environmental laws.

Location decisions, while important at the state level, also have an international context, with concerns about large production companies shifting investment outside the U.S. Production in other countries would still face variations in environmental regulations. The European Union experience with its Nitrate Directive is instructive, demonstrating that limiting producers¹ options with strict regulation of nitrate levels in an area with a limited land base has the potential to greatly reduce the scale and to influence the location of animal production. For example, an EU hog producer has built production facilities in five U.S states, in part because of EU environmental constraints.

Harmonization of environmental standards across international boundaries is a contentious topic in World Trade Organization (WTO) discussions, because of possible effects on the location of agricultural businesses, as well as geographic dispersion of the emissions. If uniform environmental regulations were to raise costs of production in some countries so high that they could no longer be competitive in export markets, producers in those countries would likely appeal for an exemption, and some countries might be willing to enhance their export competitiveness at the expense of the environment. With its abundant land base, the U.S. is generally better able to accommodate compliance with environmental regulations. However, certain localities within the U.S. -- e.g., where manure disposal is a problem (see map on page 18)--could have difficulty complying with stricter environmental regulations.

John Sullivan (202) 694-5493, Utpal Vasavada (202) 694-5610, and Mark Smith (202) 694-5490
[email protected]
[email protected]
[email protected]
A list of references is available from the authors.


Federal policies related to regulation of manure produced on confined animal operations are still evolving. The Clean Water Act (CWA)--passed in 1972 and administered by the Environmental Protection Agency (EPA)--is the major piece of Federal legislation affecting animal operations. The CWA defines water quality in terms of designated beneficial uses (e.g., drinking water, recreational use, and aquatic life support) and establishes criteria to support each use. USDA¹s Environmental Quality Incentive Program (EQIP)-authorized by the 1996 Farm Act-replaces most previous financial assistance programs and better targets assistance to areas most needing actions to improve or preserve environmental quality.

Under the CWA, National Pollutant Discharge Elimination System (NPDES) permits are required for point sources (facilities that discharge directly into a discrete ditch or pipe) that will empty into navigable waters. NPDES permits for animal feeding operations currently focus solely on developing engineering (technology-based) solutions to reduce runoff and spills from manure storage and treatment structures.

Under 1974 NPDES regulations, several criteria may be used to designate an animal feeding operation (AFO) as a concentrated animal feeding operation (CAFO), thereby labeling it a point source. The criteria may include number of animals, days in confinement, lack of vegetation in the confinement area, and potential for waste runoff into waterways. For example, an AFO could be designated a CAFO if the farm confines 1,000 or more slaughter or feeder cattle for a total of 45 days annually, or if the farm confines 300 head of slaughter or feeder cattle for 45 days annually and discharges directly into a waterway. Threshold animal numbers are specified for slaughter and feeder cattle, dairy cows, swine, laying hens, broilers, chickens, turkeys, horses, sheep, ducks, or may be a combination of animals.

EQIP is a voluntary agricultural program that can improve water quality through changes in farm nutrient management practices. EQIP provides technical, educational, and financial assistance to farmers and ranchers for adopting structural, vegetative, and management practices that protect or enhance environmental quality. By statute, half the program¹s available funding is targeted to conservation problems of livestock and poultry producers.

All 213,000 confined livestock and poultry farms are eligible for nutrient management technical assistance under EQIP. Operations with fewer than 1,000 AU are also eligible for financial assistance with manure storage or treatment facilities. Operations with more than 1,000 AU-the 2 percent that produce 35 percent of excess nitrogen-are not eligible for government financial assistance to design and build manure management facilities. Limited funds may lessen the effectiveness of EQIP. Funds allocated by EQIP were near $200 million for 1997 and 1998, but declined to around $175 million in 1999 and 2000. Even if total annual EQIP funding were devoted solely to manure management planning, average spending would be only $820 per confined livestock or poultry farm. -that will set minimum standards for all state water quality protection programs. Regulations to implement the Unified Strategy are currently under review.

Under the Unified Strategy, all animal feeding operation (AFO) owners and operators would be expected to develop and implement site-specific comprehensive nutrient management plans (CNMP), including onfarm application and off-farm disposal. The strategy will revise the criteria that identify operations requiring an NPDES permit. The largest operations will still require a permit, but NPDES permits will also be required of operations with unacceptable conditions, regardless of size, that pose a significant risk of water pollution or public health problem or that are concentrated in a watershed designated as impaired because of nutrient discharge from AFO¹s. For example, many poultry farms in the small-size category that are not currently required to obtain NPDES permits might be required to have them in the future, if their concentration in the watershed makes a significant contribution to water quality problems.

Under current EPA proposals for future NPDES permits, development of a CNMP will be a required part of the permit process. Permit applications will include management strategies for manure collection, storage, and disposal -- including use of manure nutrients in crop production.

The CNMP requirement brings land application of manure into the Federal NPDES permitting process for the first time. The costs of implementing off-farm manure management strategies are still to be determined. But more stringent application of the CNMP requirement on potential CAFO¹s could significantly reduce the possibility of excess nutrients entering water sources.

Noel Gollehon (202) 694-5539 and Margriet Caswell (202) 694-5540
[email protected]
[email protected]

SIDEBAR - Confined Animal Production Estimating Excess Manure Nitrogen

Farm-level "excess" of manure nitrogen on a confined livestock farm is manure nutrient production less crop assimilative capacity. Manure nitrogen production is estimated using the number of animals by species, standard manure production per animal unit, and nutrient composition of each type of manure. Recoverable manure nitrogen is the amount that can be collected and disposed of by spreading on fields or transporting off the producing farm. Each farm¹s nitrogen assimilative capacity (amount of nitrogen taken up by plants that are removed from the field at harvest) is based on onfarm production (acreage multiplied by yield) of 24 major field crops and pasture recorded by the Census of Agriculture. County, regional, and national estimates of excess nitrogen levels are aggregated from farm-level excess estimates (these meet all Census of Agriculture confidentiality requirements for publication).

The calculation process has the potential to overstate excess nitrogen on some farms -- because many production farms move manure off the farm instead of utilizing it on land they control -- or to understate because it ignores commercial fertilizer applications. Nevertheless, the excess values calculated here represent a consistent, national estimate of manure nitrogen that would need to leave producers¹ farms in order to be managed in a manner that reduces the potential for undesirable nutrient flows into the environment.
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