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Principles of Environmental Science Inquiry and Appications7
Chapter 7: Food and Agriculture
25
Environmental Studies
Undergraduate 1
10/23/2012

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Term
Food Security
Definition
The ability of individuals to obtain sufficient food on a day-to-day basis.
Term
Famines
Definition
Acute food shortages characterized by large-scale loss of life, social disruption, and economic chaos.
Term
Malnourishment
Definition
A nutritional imbalance caused by lack of specific dietary components or inability to absorb or utilize essential nutrients.
Term
Obese
Definition
Pathologically overweight, having a body mass greater than 30 kg/m2, or roughly 30 pounds above normal for an average person.
Term
Confined Animal Feeding Operation
Definition
Feeding large numbers of livestock at a high density in pens or barns.
Term
Surface Soil
Definition
The A horizon in a soil profile; the soil just below the litter layer.
Term
Subsoil
Definition
A layer of soil beneath the topsoil that has lower organic content and higher concentrations of fine minerals particles; often contains soluble compounds and clay particles carried down by percolating water.
Term
Sheet Erosion
Definition
Peeling off thin layers of soil from the land surface; accomplished primarily by wind and water.
Term
Rill Erosion
Definition
The removing of thin layers of soil as little rivulets of running water gather and cut small channels in the soil.
Term
Gully Erosion
Definition
Removal of layer of soil, creating channels or ravines too large to be removed by normal tillage operations.
Term
Desertification
Definition
Denuding and degrading a once fertile land, initiation a desert-producing cycle that feeds on itself and causes long-term changes in soil, climate, and biota of an area.
Term
Waterlogging
Definition
Water saturation of soil that fills all air spaces and causes plant roots to die from lack of oxygen; a result of overirrigation.
Term
Salinization
Definition
A process in which mineral salts accumulate in the soil, killing plants; occurs when soils in dry climates are irrigated profusely.
Term
Organophosphates
Definition
Organic molecules to which a phosphate group is attached.  A group of highly toxic pesticides that are primarily neurotoxin.
Term
Chlorinated Hydrocarbons
Definition
Hydrocarbon molecules to which chlorine atoms are attached.  Often used as pesticides and are both highly toxic and long-lasting in the environment.
Term
Green Revolution
Definition
Dramatically increased agricultural production brought about by "miracle" strains of grain; usually requires high inputs of water, plant nutrients, and pesticides.
Term
Genetic Engineering
Definition
Laboratory manipulation of genetic material using molecular biology.
Term
Genetically Modified Organisms (GMOs)
Definition
Organisms created by combining natural or synthetic genes using the techniques of molecular biology.
Term
Sustainable Agriculture (Regenerative Farming)
Definition
Ecological sound, economically viable, socially just agricultural system.  Stewardship, soil conservation, and integrated pest management are essential for sustainability.
Term
Regenerative Farming
Definition
Farming techniques and land stewardship that restore the health and productivity of the soil by rotating crops, planting ground cover, protecting the surface with crop residue, and reducing synthetic chemical inputs and mechanical compaction.
Term
Contour Plowing
Definition
Plowing along hill contours; reduces erosion.
Term
Strip-Farming
Definition
Planting different kinds of crops in alternating strips along land contours; when one crop is harvested, the other crop remains to protect the soil and prevent water from running straight down a hill.
Term
Terracing
Definition
Shaping the land to create level shelves of earth to hold water and soil; requires extensive hand labor or expensive machinery, but it enables farmers to farm very steep hillsides.
Term
Cover Crops
Definition
Plants, such as rye, alfalfa, or clover, that can be planted immediately after harvest to hold and protect the soil.
Term
Reduced Tillage Systems
Definition
Farming methods that preserve soil and save energy and water through reduced cultivation; includes minimum till, conserve-till, and no-till systems.
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