Composting Poultry Mortalities20 August 2012
Advice on improving composting on farm by Mark Risse, John Worley and Frank Henning of Cooperative Extension at the University of Georgia, College of Agricultural and Environmental Sciences.
Why should I be concerned?
Farmers are concerned with soil and water quality. With a rapidly expanding poultry industry and
equally rapid urban growth, it is becoming more difficult for farmers to safely dispose of poultry moralities*.
An acceptable system for the disposal of dead birds is essential to any well run poultry operation. Current practices include incineration, burial pits, land filling, digestion/fermentation, rendering and composting. Composting of dead birds is a more recent disposal alternative that is environmentally sound. This process converts dead birds into a humus-like material that can be spread on land for crop utilization and/or soil improvement. This relatively inexpensive method of dead bird disposal is rapidly gaining acceptance in the poultry industry.
Unlike the other Farm *A*Syst assessments that focus on farmer stewardship and the environmental soundness of facilities and management practices, this assessment focuses on your composting facilities and procedures to ensure that the process prevents health risk or soil and water contamination. This assessment should be used in conjunction with the Broiler or Layer Production Farm *A*Syst assessments that address other environmental concerns pertaining to your operation.
How does this assessment improve the composting facility on my farm?
- This assessment is designed to ensure that your composting facilities, tools and techniques are part of a sound waste management plan.
- If you are a contract farmer, it is recommended that you involve your integrator in this farm assessment. Your company has recommendations on carcass disposal and litter clean-out pertinent to this process.
- Do not make any management changes based on this assessment that may affect your animals without consulting your integrator.
- You are encouraged to complete the entire document.
- The assessment should be conducted by you for your use. If needed, a professional from the Georgia Cooperative Extension or one of the other partnership organizations can provide assistance in completing the assessment.
- You are encouraged to develop an action plan.
- Farm *A*Syst is a voluntary programme.
- No information from this assessment needs to leave your farm.
Assessing your poultry mortality composting practices
For each category listed on the left, read across to the right and circle the statement that best describes conditions on your farm. If a category does not apply, for example, if you always spread litter immediately after cleaning out and thus never store litter on your farm, then simply skip the question. Once you have decided on the most appropriate answer, look above the description to find your rank (4, 3, 2 or 1) and enter that number in the 'Rank' column. The entire assessment should take less than 30 minutes.
|Poultry mortality composting practices|
|Permitting for poultry mortality composting facilities|
|Permitting for composting facilities||Producer has a permit from the state veterinarian that accurately describes composting procedures and type of facility being used.||Producer has a permit but facilities and/or procedures have changed slightly since permit was issued.||Producer has a permit but facilities and/or procedures have changed significantly since permit was issued.||Producer does not have a composting permit from the state veterinarian.**|
|This applies if composting is your only means of dead bird disposal. If another method is used to dispose of dead birds, this amount could vary.|
|Compost bin capacity||Capacity of both primary and secondary composters meet or exceed peak disposal requirements.||Composters can handle 75% of peak disposal requirements.||Composters can handle 50% of peak disposal requirements.||Composters cannot handle 50% of peak disposal requirements.|
|Compost facility design and construction|
|Roof and floor design||Compost bins have a roof with an overhang to prevent rain from reaching compost and an impervious floor.||Compost bins have a roof without sufficient overhang to prevent rain from reaching compost and an impervious floor.||Compost bins have some covering but no impervious floor.||Compost bins are not covered and sit directly on the ground.|
|Fire Safety||Compost facility has fire protection equipment on site and water access.||Producer has access to nearby fire protection equipment.||Producer has a water supply on site but no plans for fire protection.||Producer has no plans for fire protection, equipment or access to water.|
|Employee training in dead bird composting methods||All employees associated with composting are thoroughly trained in dead bird composting procedures.||Employees who regularly compost are thoroughly trained in dead bird composting procedures.||Employees associated with composting receive limited training on dead bird composting.||Employees associated with composting receive no training on dead bird composting.|
|Composting procedures||Are outlined in an easy to follow recipe, available to all composters, which describes amount, order, placement and treatment of all ingredients being composted.||Recipe is used, but does not contain all needed information.||Operator has a quality recipe for compost, but recipe is seldom used.||Operator either does not have a compost recipe or never uses a recipe for composting|
|Microorganisms responsible for composting are supplied by||A double layer of fresh active (warm) litter or litter cake with 40-60% moisture, reactivated litter or active compost.||A double layer of dry litter or dry litter cake, or less than a double layer of active litter or litter cake.||Less than a double layer of dry litter or dry litter cake used as starter.||No starter used.|
|Carcass placement||Carcasses are never placed closer than 6 inches from sidewalls or top of bins.||Carcasses are never placed closer than 6 inches from bin sidewalls, but are sometimes left uncapped overnight.||Carcasses are sometimes placed within 6 inches of bin sidewalls.||No attempt is made to keep carcasses away from top or sides of bin.|
|Filling birds||Birds are covered daily with at least a double layer of litter cake or 1.5 parts by weight of litter for each volume/weight of birds. When full, bin area capped off with a double layer of litter||Birds are covered daily with less than two volumes of litter cake for each volume of birds or less than 1.5 parts by weight of litter per bird weight.||Birds are covered daily with varying amounts of litter.||Birds are not covered or compost bin is filled to a height of 4 to 4½ feet and compost is either left uncapped, or is capped with less than a double layer of litter.|
|How is the moisture content of compost determined||Moisture meter.||Estimated by hand.||Estimated visually.||No attempt made to monitor or adjust moisture.|
|Compost temperature and measurement||Probe type thermometer is used daily to measure and plot temperature 8-10 inches into the center of compost pile. Temperature rises to 130-150°F within 2-4 days after the bin is capped off.||Temperature is measured daily but takes a week or more to reach 130-150°F.||Temperature is measured, but not daily, and never reaches 140°F.||Temperature is not measured or never reaches 130°F or sometimes exceeds 160°F.|
|When compost is turned||Compost in the first bin has undergone at least 7-10 days of composting after being capped off, and the temperature has peaked (130-150°F) and begun to fall.||Temperature in the first bin has peaked and begun to fall, but compost is turned less than 7 days after compost was capped off.||Temperature in the first bin has not peaked and begun to fall.||Producer either has only one primary bin, and therefore has no way to dispose of birds once this bin is capped off, or producer does not measure temperature.|
|Compost stack height||Compost (primary or secondary) never stacked higher than 5 feet.||______________||______________||Height of either primary or secondary compost sometimes exceeds 5 feet.|
|Aerating compost||In a timely manner, compost is cascaded using loader bucket or otherwise re-aerated while being loaded into secondary bin.||Compost is moved to secondary bins, in a timely manner, but no attempt is made to re-aerate compost.||Compost is moved, and re-aerated, but only after odors and fly breeding are obvious.||Compost is never moved from primary to secondary bin(s).|
|Presence of flies, vermin or foul odours associated with composting activities||Never.||Occasionally.||Usually.||Always.|
|Compost use/land application|
|Soil testing of compost application site||Yearly.||Every 2 years.||Every 3-5 years.||Less frequently than every 5 years.|
|Phosphorus level of soil compost application site||Low.||Medium.||High.||Very high.|
|Application Rates||Compost applied to fields at rates that meet crop nutrient requirements based on a nutrient management plan (NMP). Litter and soils are tested.||Compost applied to cropped fields at rates that do not exceed 2.5 tons/acre/application, and do not exceed 5 tons/acre/year. Soils in the application areas are tested.||Compost applied to cropped fields at rates that do not exceed 2.5 tons/acre/application, and do not exceed 5 tons/acre/year. Soils in the application areas are not tested.||Manure and compost are applied to cropped lands at rates that exceed 2.5 tons/acre/application, or exceed 5 tons/acre/year; or these materials are applied to uncropped lands at any rate.|
|Application timing||According to accurate nutrient accounting or NMP. Never apply in wet conditions.||Based on when crop is at growth stage that usually needs fertilizing. Avoid applying wet conditions.||Based on convenience. When manure cleaned out of houses and compost is available. Try to avoid applying in wet conditions.||Based on convenience. When manure cleaned out of houses and compost is available. Often applied when soil is wet.|
|Application areas||All areas are more than 25 feet from rock outcrops, 100 feet from surface water sources, wells, dwellings, or sinkholes and have slopes of 15% or less. Or all areas are approved by a NMP.||Most areas are more than 25 feet from rock outcrops, 100 feet from surface water sources, wells, dwellings, or sinkholes and have slopes of 15% or less. Or most areas are approved by a NMP.||Several areas are less than 25 feet from rock outcrops, or less than 100 feet from surface water sources, wells, dwellings, or sinkholes, or have slopes greater than 15%.||Manure nearly always spread over areas that are less than 25 feet from rock outcrops, or less than 100 feet from surface water sources, wells, dwellings, or sinkholes, or that have slopes greater than 15%.|
|Record keeping||Complete records kept on farm applications and nutrients leaving farm through sales or giving away.||Partial records kept on farm applications and nutrients leaving farm through sales or giving away.||Partial records kept on farm applications but no records on nutrients leaving the farm.||No records kept.|
|Calibration||Nutrient application equipment calibrated to proper application rate before each application. Uniform application over the area is assured.||Nutrient equipment calibrated annually. No effort to assure uniform nutrient application over the area.||Use custom nutrient hauler and applicator that does not calibrate equipment, or calibrates equipment less than once a year.||Never calibrate nutrient application equipment or ask custom applicator about calibration procedure.|
|** These conditions are in violation of state and/or federal law.|
|Number of Areas Ranked ______
(Number of questions answered, if all answered, should total 22 questions.)
Ranking Total _____
(Sum of all numbers in the 'RANK' column)
What do I do with these rankings?
Step 1: Identify areas that have been determined to be at risk
Low risk practices (4s) are ideal and should be your goal. Low to moderate risk practices (3s) provide reasonable
protection. Moderate to high risk practices (2s) provide inadequate protection in many circumstances. High
risk practices (1s) are inadequate and pose a high risk for causing environmental, health, economic, or regulatory
High risk practices, rankings of '1' require immediate attention. Some may only require little effort to correct, while others could be major time commitments or costly to modify. These may require planning or prioritizing before you take action. List all activities identified as “high risk” or “1s” in the recommended action plan. Rankings of '2s' should be examined in greater detail to determine the exact level of risk and attention given accordingly.
Step 2: Determine your composting risk ranking
The Composting Risk Ranking evaluates your composting practices for safe environmentally sound disposal
of dead birds. It ranks a producer's composting facilities, tools and techniques and identifies areas that may
be a risk to a sound water management plan.
Use the ranking total and the total number of areas for your Composting Risk Ranking.
__________ / __________ = __________
COMPOSTING RISK RANKING .......................LEVEL OF RISK
3.6 to 4 ....................................................................Low Risk
2.6 to 3.5 .................................................................Low to Moderate Risk
1.6 to 2.5 .................................................................Moderate Risk
1.0 to 1.5 .................................................................High Risk
This ranking gives you an idea of how your compost practices might be affecting disease transmission, fire hazards and threats to water resources, as well as the soundness of your waste management plan. This ranking should serve only as a very general guide, and not as a precise diagnosis since it represents the average of many individual rankings.
Step 3: Read the 'Composting Facts' portion of this assessment
While reading, think about how you could modify your practices to address some of your moderate and high
risk areas. If you have any questions that are not addressed in the composting facts section of this assessment,
consult the references in the back of this publication or contact your county extension agent for some information.
This assessment should be used in conjunction with the Broiler or Layer Production Farm *A*Syst Assessment.
Composting is a natural, biological process
by which organic material is broken down and decomposed
because of the bacteria and fungi that digest
the organic material and reduce it to a stable
humus. The principles of composting are quite
simple: just provide the microorganisms with an
environment conducive to their growth — a balanced
diet, water and oxygen.
In order for composting to be successful as a method of dead bird disposal, the following must take place:
- all birds must be decomposed beyond recognition
- risk from disease transmission must be eliminated
- fire hazards must be minimized
- any threats to water resources must be prevented
- flies must not present a nuisance.
Permitting for poultry mortality composting facilities in Georgia
All methods for the disposal of dead animal
carcasses require permits from the Georgia Department
of Agriculture (GDA). Growers must submit a
written request to the state veterinarian.
The letter requesting the permit should state the name that the producer wants to appear on the certificate of compliance and describe the composting procedures and the type of facility to be used. It must also include the producer's pit number, if he or she has one. If this is a new farm, this should be stated at the time of request.
If the producer plans to have a composting facility inside the poultry house, approval from the poultry contracting company is required. A form is available from the Georgia Poultry Federation.
Interested growers should first contact their local Natural Resources Conservation Service (NRCS) to obtain information on composting and compost facilities.
Composting procedures (or recipes) developed by the Cooperative Extension Service (CES), NRCS, Farm Service Agency (FSA), or the Resource Conservation Development Council (RC&D) must be used.
In order to meet peak disposal requirements, compost facilities must be properly sized.
Primary bin capacity:
The total minimum volume of the primary bins of
composters can be calculated from the expression
V = B × (M/T) × WB × 2.5
- V is the total minimum volume in the primary bin in cubic feet
- B is the total number of birds on the farm
- T is the days of flock life
- WB is the average market weight of the birds in pounds
- M is the per cent mortality expressed as a decimal (example 5 per cent = 0.05)
- The factor of 2.5 in this equation represents 2.5 cubic feet of composter volume required per pound of dead birds.
Secondary bin capacity:
The total volume of the secondary bins should be the same as the primary composter capacity.
Compost facility design and construction
Some materials are composted outside. However, a roof ensures all-weather operation and helps control rain, snow, runoff, and percolations which can be major concerns. In order to prevent excessive moisture in compost, the roof over compost bins must extend sufficiently to protect the compost from blowing rains.
An impervious (waterproof) floor with a weight bearing foundation (able to withstand the weight and force exerted by farm machinery used in operating the compost facility) is recommended to ensure all-weather operation and to secure the composter against rodents, dogs and other nuisances. An impervious floor also will help dispel questions about contamination of the groundwater and other surrounding areas. A concrete apron, sloped away from the primary bins is recommended. This provides an all-weather surface for equipment and operation.
Temperatures of 140-150°F are often reached
in composters within a few days after a bin is capped
off with litter. Excessive height and compacting
increase the chance that the temperature in the
composter will exceed 160°F. Temperatures this
high are conducive to spontaneous combustion.
One stacking house in Georgia and at least one other in Virginia burned from spontaneous combustion. Temperatures should be monitored daily and fire extinguishers and water should be readily available to guard against this hazard. If smoldering begins to occur, compost should be removed immediately.
Compost management and operation
The requirements for proper and complete decomposition of dead carcasses are reasonably simple, but proper management is essential. Decomposition of the dead carcasses and litter depends upon microbial activity. The greater the microbial growth, the faster the carcasses decompose. Anything that slows down microbial growth lowers the temperature of the composting material and slows the composting process. The more rapid the microbial growth, the greater the heat output and temperatures of the composting mass and the more rapidly the mass breaks down.
All farm workers involved with composting poultry moralities should be trained in composting procedures. Workers lacking training should not be involved in composting dead birds.
Recipe for ingredients that go into compost
The essential elements for the microorganisms involved in composting are carbon (C), nitrogen (N), oxygen (O2) and moisture (H2O). If any of these elements are lacking, or if they are not provided in the proper proportion to one another, the microorganisms will not flourish and will not provide adequate heat.
|Table 1. Original recipe for composting poultry mortalities|
|Material||Parts by Weight
|Straw (wheat preferred)||0.1|
|Table 2. Litter cake recipe for composting poultry mortalities|
|Material||Parts by Volume|
|Litter Cake||2.0 - 3.0|
|Water||0 - 0.5|
Procedures for composting poultry mortalities
- Start by placing a double layer (usually 8-12 inches) of active litter or litter cake, with 40-60 per cent moisture on the composter floor.
- This litter will supply bacteria and heat to start the process. This layer will also help in absorbing moisture if excess water is added to the composter. (The base layer should not be placed more than a few days prior to use for composting birds or it will cool as bacterial numbers reduce when moisture or oxygen becomes limited.)
- Unless litter cake is used which is bulky with much air-holding ability, a thin layer of peanut hulls, coarse shavings or straw is added next.
- A layer of dead bird carcasses is then added. The carcasses should be arranged in a single layer side by side, touching each other. Carcasses should be placed no closer than six inches from the walls of the composter. Carcasses placed too near the walls will not compost as rapidly, since the temperature is cooler near the walls.
- A layer of litter cake (40 to 60 per cent moisture content) twice as thick as the layer of carcasses underneath or litter (1.5 parts by weight) is added next. This layer should be twice as thick as the layer of carcasses underneath.
- If only a partial layer is needed for a day's mortality, the portion should be covered with litter. The rest of that layer can be used with subsequent mortality.
- A small amount of water may be needed after each layer. If much water is required, the litter is too dry and probably low in live bacteria.
- After completing the initial layer, subsequent layers of either litter cake and carcasses or litter, bulking ingredients and carcasses follow. Keep adding layers until compost height approaches 4 to 4½ feet. Do not exceed 5 feet.
- Cap off with a double layer of litter so that the height of compost in the bin does not exceed 5 feet. Excessive height increases the chance that the composter temperature will exceed 160°F which increases the risk of spontaneous combustion.
|Table 3. Carbon:nitrogen ratio|
|Litter||7:1 to 25:1|
If two parts by volume of litter, one volume of dead birds, and adequate bulking agent is either contained in the litter, or added prior to the carcasses, the C:N ratio should be adequate. If moisture and aeration are adequate, materials with lower C:N ratios usually compost at higher temperatures.
The microorganisms responsible for composting are initially supplied by active litter or litter cake. The microbes in the litter used in the composting process need to be kept alive and in sufficient numbers so that composting can begin immediately to break down the carcasses and the litter. Litter that is too dry and too long removed from the house will contain very low numbers of microorganisms. Old and dry litter that contains low numbers of the necessary microorganisms slows the process of carcass decomposition.
Litter that is too dry or old should be activated
before it is used in the composting process.
A quantity of litter to be used in the next week can
be reactivated by raising the moisture content up to
40-60 per cent. Excessive moisture displaces the
oxygen, which reduces the heating and causes seepage.
Moisture is critical. If the moisture level is correct, the microorganisms in the pile will again begin multiplying, raising the temperature of the litter. When hot (130-150°F), the litter is ready for use in decomposing carcasses.
Water is essential to the growth of any living
organism. Composting microorganisms thrive
in moist but not soggy conditions. Desirable moisture
content in the composting materials is between
40 and 60 per cent. Excessive moisture displaces
the oxygen, which reduces the heating and causes
seepage. Too little will prevent microorganisms
from reproducing to adequately high numbers.
Compost moisture can be accurately measured with a moisture meter. However, moisture content can be estimated by hand. The moisture content of litter used for starter or compost is about right, if when it is squeezed with the hand, it breaks into to three large pieces when the hand is opened. If water can be squeezed from the material, the moisture content is too high.
Composting begins as soon as the loading begins. Depending on the size of the primary cell and the number and size of carcasses, the loading time will vary. With active litter, a week's loading time may allow the lower levels to rise to 150°F by the time the cell is capped. A probe type thermometer is used daily to measure and plot temperatures 8-10 inches into the center of the compost pile.
While three consecutive days at 130°F or more in the composter is adequate to destroy pathogens harmful to man and poultry, composting in the primary bin normally occurs over a 10- to 21-day period.
Measure and record temperatures in each bin
daily to ensure that dead birds have been pasteurized,
to minimize the risk of spontaneous combustion
and to determine when to turn the compost.
When oxygen becomes limited, the temperature of the compost begins falling. By the time it drops to 130°F - about 7-21 days after capping - the compost can be moved to a secondary cell. At a temperature of 150°F, the birds decompose about twice as fast as at 130°F. If the temperature of the compost reaches only 130°F, birds nearer the walls, where it is cooler, will decompose very slowly.
The composting product can be sustained at higher temperatures by using a bulking agent which makes the compost pile more porous and thus supplies more oxygen to the composting process. A coarse material, such as wood shavings, straw or peanut hulls will ensure more oxygen, allowing higher composting temperatures. Also, adding more litter or litter cake increases heating. If litter cake is used, little or no bulking agents are needed.
Compaction and stack height:
Do not compact litter in deep layers and do not stack your compost higher than five feet. Temperatures of 140-150°F are often reached in composters within a few days after a bin is capped off with litter. Excessive height and compaction will increase the chance that the temperature in the composter will exceed 160°F. Temperatures this high are conducive to spontaneous combustion.
Aeration and moving compost to second cell
The purpose of moving the product is to re-mix
and aerate it so that a faster, more complete
break-down of the compost occurs. Allow material
to 'cascade' from the loader bucket to provide good
turning and re-aeration as it is deposited in the secondary
treatment area. The movement to a second
cell will probably be necessary to get adequate decomposition
if the birds exceed 4-5 pounds or if
material is removed from below and added above
(see package composters).
The product temperature should again rise to 150°F within days. Delayed movement, poor aeration, poor mixing or moisture above 60 per cent or below 40 per cent will cause the mass not to heat properly.
Once the temperatures (determined by daily monitoring) drops from 150°F to 130°F (7-21 days), the product is ready to be used as a fertilizer.
Flies and odour
Flies and odour are not a problem where composters are operating properly. The heat destroys the habitat for flies and since the process is aerobic (in the presence of oxygen), very little odour is produced. Improved management is usually the best solution to odour and fly problems.
Composter types and lay-outs
Composters presently used for dead birds consist of four types.
- Package composters: (Figure 2) These composters are commercially available. The composted by-products fall to the bottom of the composter down to the concrete slab where they are then shovelled by hand back to the top to compost new dead birds. A five-gallon bucket of new litter material is normally added to each composter each week. A few operators will add a small amount of bulking agent such as peanut hulls or cotton seed to trap oxygen and promote heating.
- Delmarva (small bin): (Figure 3) The front
wall of the bins consists of two-inch thick boards
which are mobile to help with filling and removing
the material to be composted. The material
in the composters is moved with some type
of end loader or skid steer loader. Therefore,
the width of the small bin composter must allow
the loader bucket to get into the bin.
Normally these small bin composters are 8-10 feet wide by five feet high and five feet deep. The depth is limited to five feet due to the reach required to drop the composted material into the secondary bin, which is immediately behind the primary or small bin. Moving the material from the primary bin to the secondary bin after 10 to 21 days is common for Delmarva-type composters to mix in oxygen in the mass to promote heating. The oxygen is added as the mixture is dropped or moved from the primary bin to the secondary bin.
- Big bin (adaptation of the Delmarva): (Figure 4) The big bin uses a primary bin which does not have a removable front. In fact, the front is totally open and the compost material slopes back slightly with the front face of the composted material standing at an angle of about 70-75°. The front face of the pile must slope back slightly because the material will not stand on a vertical angle since no front wall is present for support. Many larger growers prefer the big bin composters. The big bin type composter is normally 10-12 feet wide and 20- 50 feet or more in length. The primary and secondary bin are usually side by side or parallel to each other and built like a bunker silo. The big bin composter, like the small bin type, is filled to a height of five feet.
- Mini-composter: (Figure 5) The mini-composter is a type of composter which can be used inside the broiler house for the disposal of birds up to about five to six pounds. These may be as simple as four pallets tied together at the corners and lined with wire mesh to make a cubicle.
Poultry mortality compost is a nutrient-rich
material. This material can benefit the farm if it is
adequately protected and correctly land-applied.
However, storage and application of this nutrient
rich material can be a threat to farm water sources
if not done properly.
Stored compost should be sampled and tested to determine its nitrogen, phosphorus and potassium content. These nutrient values, combined with the amount of litter or residue applied per acre, allow for determination of whether more commercial fertilizer should be added to meet realistic crop production goals.
A Nutrient Management Plan (NMP) assists you in effectively using poultry mortality compost in an environmentally safe manner. Any situation where compost or animal waste is not effectively managed gives rise to potential pollution. Nitrogen in poultry mortality compost can be converted into the nitrate that can cause methemoglobinemia (blue baby syndrome) in infant humans and livestock. The phosphorus contained in compost can cause algal blooms and increase the rate of eutrophication in surface waters.
A sound nutrient management plan begins with the type and number of animals in the farm operation and includes every aspect of waste handling. It includes how the waste will be gathered and stored including how large the storage facilities need to be. It also specifies areas to be used for manure applications, crops to be grown, the area of land needed to utilize available nutrients and the method of timing of application.
The NMP should identify the locations, acreage and types of crops or pasture to which any wastes are to be applied. An owner may have plenty of land for application of animal wastes, but some of it may be located a great distance from the poultry houses. The practice of spreading dead animal compost only on the nearest fields can result in excessive nutrient-loading rates to the soil and possibly cause water quality problems.
Dead bird compost application
Application rates, calibration and timing, and record keeping should be handled like manure. The Georgia Cooperative Extension Service, NRCS county offices and Georgia Department of Agriculture (GDA) can provide information on composting as well as other disposal methods. Compost should go through at least two decomposing cycles (primary and secondary treatment) before being land applied.
Soil testing of application sites
Compost can be sampled and tested to determine
the nitrogen, phosphorus and potassium content.
These nutrient values combined with values
for manures, crop residues and starter fertilizer help
determine whether more commercial fertilizer
should be added for desired crop production.
All land applications of poultry mortality compost should be based on soil test, compost analysis and realistic crop yield goals.
Keep records of the dates, quantity and specific application sites. If you sell the litter, keep a record of buyers, dates, amounts and the farm sites where buyers apply or use the litter. These records can assist you with management and protect you from liability.
The best application rate depends on the
crop being produced, the soil's nutrient content and
the nutrient content of the applied material. Soil
testing and litter nutrient analyses are recommended
procedures for best determining litter application
amounts. Application equipment should be calibrated
for accurate and even distribution.
Poultry compost should be evenly distributed over application sites at a rate determined and listed in your nutrient management plan.
Vehicles must be covered or tarped for transporting poultry compost on state or federally maintained roads or any public road.
Your county extension office can provide more information on soil testing, litter analyses, equipment calibration, record keeping and other areas related to poultry compost land application.
Surface land application of poultry manure and compost residue should not be undertaken when soil is saturated, during rainy weather or when rain is in the immediate forecast.
Consider unique features of the farm and
make your management plan specific for these features.
Do not apply poultry compost to the surface
and subsurface within 100 feet of streams, ponds,
lakes, springs, sink-holes, wells, water supplies or
dwellings. Grass, vegetation and/or forest buffer
strips along stream, pond or lake banks are helpful
in preventing nutrient runoff from adjacent fields and
Do not apply nutrients on slopes with a grade more than 15 per cent or in any manner that will allow nutrients to enter the waters of the state.
Calibration of waste application equipment, such as irrigation systems, tank wagons and manure spreaders is needed to ensure safe and efficient distribution of waste materials. Equipment should be calibrated and rechecked at least once during the application period since the consistency of the composts can vary greatly. For more information about calibration of waste-spreading equipment, contact your county Extension office.
Aerobic: In the presence of oxygen or air
Cake litter: Clumps or larger pieces of poultry manure and bedding that are removed from the litter surface using a de-caking machine. Cake usually results from the presence of excessive moisture.
Compost: Organic residues that have been collected and allowed to decompose.
Composting: A controlled process of decomposing organic matter by microorganisms.
Cost Sharing: A programme in which Consolidated Farm Service Agency (formerly the Agricultural Stabilization and Conservation Service) pays a percentage of the costs of a project, facility or effort.
Decomposition: The break-down of organic materials.
Eutrophication: The process by which increasing nutrients in a water body promotes plant over animal life, often creating conditions with very low oxygen in the water.
Impervious: Incapable of being penetrated by water or other liquids.
Leaching: The removal of soluble substances from soils or other material by water.
Litter: A mixture of poultry manure and bedding material.
Mortality: Birds that died during production.
Nutrients: Elements necessary for plant growth, such as nitrogen (N), phosphorus (P) and potassium (K).
Nutrient Management Plan: A specific plan designed to manage animal manures and moralities so that the most benefit is obtained and the environment is protected.
Stack house (shed): A structure designed and built for the storage of poultry manure or compost.