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Non-program crops

Any agricultural commodity not covered by federal commodity programs. Program crops are wheat, corn, barley, grain sorghum, oats, upland cotton, and rice.

Non-public water system

Comprised of private and semi-private water systems.

Non-transient, non-community water system

“A non-community water system that regularly serves the same 25 or more persons at least 6 months per year.” (415 ILCS 55/9a4.5) Such systems are regulated by the IDPH. An example of a non-transient, non-community water system is a well that serves a public school.

Nonbiodegradable

Substance that cannot be broken down in the environment by natural processess. See biodegradable.

Nonlinearities

Occur when changes in one variable cause a more than proportionate impact on another variable.

Nonpoint source pollution

Pollutants that are not discharged or emitted from a specific "point" source, such as a pipe or smokestack. Nonpoint water pollutants are often carried from dispersed, diverse sources into water channels by rain-induced runoff. Runoff from streets, open pit and strip mines, and agricultural fields are prominent examples (see agricultural pollution). Nonpoint source air pollutants (often called fugitive emissions) include small dispersed sources, e.g., fireplace smoke, and uncontained emissions, like dust blown from fields and unpaved roads.

Nonrenewable resources

Nonrenewable resources, in contrast to renewable resources, do not naturally replenish themselves within time limits that permit sustained yield (i.e., minerals and hydrocarbons, such as phosphate rock, limestone, petroleum). Nonrenewable resources may be called stock resources because of their fixed supply. Some resources, such as soil and water, can be termed either nonrenewable or renewable depending on circumstances. For example, some underground reservoirs replenish so slowly they are effectively nonrenewable, such as the Ogalala Aquifer. Soil that is eroding faster than its T value faces eventual depletion.

Normal

A central value (such as arithmetic average or median) of annual quantities for a 30-year period ending with an even 10-year, thus 1921-50; 1931-60, and so forth. This definition accords with that recommended by the Subcommittee on Hydrology of the Federal Inter-Agency Committee on Water Resources.

Normal yield

The average historic yield established for a particular farm or area. Can also describe average yields. Normal production would be the normal crop acreage planted multiplied by the normal yield. These measures, required by previous commodity programs to calculate benefits, are not required for production flexibility contracts under the FAIR Act of 1996.

Normative Economics

Analysis that contains value judgments, either implicitly or explicitly (see Economics or Positive Economics).

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