OBF study materials
OBF study resources

OBF flashcards

OBF · Build recall with a focused review session.

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Organic system plan
A written document describing production practices, materials used, monitoring methods, and record-keeping that a certified operation follows and updates when practices change.
National List
The regulatory list specifying synthetic substances allowed in organic production and non-synthetic substances prohibited from use, reviewed periodically.
36-month transition
The period during which no prohibited substances may be applied to land before a crop harvested from it can be sold as organic.
Ruminant pasture rule
Requires grazing for at least 120 days per year and at least 30 percent dry matter intake from pasture for organic ruminants.
Crop rotation
A planned sequence of different crops on the same land that interrupts pest cycles, balances nutrients, and reduces dependence on external inputs.
Biological pest control
Management of pests using living organisms such as predators, parasitoids, and pathogens, supported by habitat that sustains their populations.
Net return per acre
Gross revenue from a field minus variable and fixed costs attributed to it; used to compare practices more reliably than gross yield.
Field trial replication
Repeating each treatment in multiple plots so treatment effects can be distinguished from natural field variability and random error.
Carbon-to-nitrogen ratio
The balance of carbon and nitrogen in organic material; high ratios slow decomposition and can temporarily immobilize soil nitrogen.
Economic threshold
The pest density at which the cost of control equals the value of the crop loss prevented, marking the point where treatment pays.
Soil pH and nutrients
A measure of soil acidity that governs nutrient availability; values below about 6.0 reduce phosphorus availability and legume nodulation.
Diagnostic order for crops
A systematic sequence checking water, nutrients, pests, disease, and chemical injury, using field distribution patterns to isolate the cause.
Compost maturity
The stage when decomposition slows, temperature declines after the hot phase, and the carbon-to-nitrogen ratio approaches roughly 25 to 30 to 1.
Cover crop termination
The timing and method of ending a cover crop, which determines whether nitrogen is released to the next crop or temporarily tied up.
Certification process
The sequence of application, plan review, on-site inspection, and certificate issuance, repeated annually to maintain organic status.
Audit trail records
Documents linking inputs, field activities, harvests, and sales that allow an inspector to verify organic integrity from field to market.
Split operation controls
Procedures that keep organic and non-organic products separate during storage, handling, and transport to prevent commingling.
Buffer zone
A physical distance or barrier that protects an organic field from prohibited substances applied on adjacent land or from contamination.
Supplier certificate verification
Confirming that purchased inputs come from certified sources with current documentation, while also checking that the material is allowed for the intended use.
Sanitation as pest control
Cleaning and preventive controls in handling facilities that remove food and habitat, limiting pest and pathogen establishment.
Organic labeling tiers
Labeling categories based on organic content: 100 percent organic, organic at 95 percent or more, and made with organic ingredients at 70 percent or more.
Below 70 percent rule
Products with less than 70 percent organic ingredients may list them on the information panel but cannot use the organic seal.
Residue testing response
Detection of a prohibited substance triggers investigation by the certifier and may lead to loss of certification.
Traceability requirement
The ability to follow a product from field through handling to sale, deterring fraud and supporting enforcement of labeling rules.
Conflict of interest disclosure
Inspectors and certifiers must reveal financial or personal interests in an operation and recuse themselves from assessing it.
Confidential business information
Sensitive operational data collected during certification that must be protected and not disclosed without proper authorization.
Contamination remediation plan
A documented response to prohibited substance use on organic land, defining corrective actions and the period before organic status returns.
Must, may, must not
A communication framework that separates requirements, allowances, and prohibitions so audiences clearly understand what the organic rules permit.
Drift notification
Written notice to neighboring farms about planned applications, reducing the risk of prohibited substances reaching organic fields.
Evidence-based recommendation
Advice grounded in cited data such as soil tests or replicated trial results, allowing the audience to evaluate the reasoning.
Data-sharing agreement
A written arrangement specifying which records are exchanged, with whom, and for what purpose, protecting confidentiality among collaborators.
Seasonal review meeting
A structured team discussion of observed results that adjusts practices and improves shared understanding of the operation's plan.