Organic Rules and Certification

Manure fertilizers, composting - US NOP 2002

Huber, Beate (2005) Manure fertilizers, composting - US NOP 2002. [Organic rules - Differences between other regulations/standards and EEC No 2092/91]

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Provision for compost (§205.203, (2)): Composted plant and animal materials produced through a process that (i) established an initial C:N ratio of between 25:1 and 40:1; and (ii) maintained a temperature of between 131 F and 170 F for 3 days using an in-vessel or static aerated pile system; or (iii) maintained a temperature of between 131F and 170F for 15 days using a windrow composting system, during which period, the materials must be turned a minimum of five times.


US requires composting of manure (with three exceptions where application of raw manure is acceptable). US defines 'compost' and sets requirements for composition, time, temperature, and number of times that it must be turned. EU Regulation 2092/91 does not include regulations for composting, other than allowing the use of plant-based and other biological preparations. US allows micro-organisms and other biological amendments unless specifically prohibited.


An organic producer using a composted material containing manure must comply with the nutrient cycling and soil and water conservation provisions in his or her organic system plan but is not constrained by the restrictions that apply to raw manure. Therefore, producers intending to apply soil amendments will require clear and verifiable criteria to differentiate raw manure from composted material. USDA developed the requirements in the final rule for producing an allowed composted material by integrating standards used by the Environmental Protection Agency (EPA) and USDAs Natural Resources Conservation Service (NRCS).

EU Regulation

Annex I. Principles of organic production and processing > A.Plant and plant products > Fertilizing - Annex I A2

Item type:Organic rules - Differences between other regulations/standards and EEC No 2092/91
Subjects:Crop production > Fertilisers
Principles:Ecological principle
Principle of health
ID Code:498
Deposited On:20 Nov 2005
Last Modified:24 Nov 2008 08:19

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