Unit 7: Soil, Agriculture, and Food

In toxicology, the median lethal dose, LD50 (abbreviation for “Lethal Dose, 50%”), LC50 (Lethal Concentration, 50%) or LCt50 (Lethal Concentration & Time) of a toxic substance or radiation is the dose required to kill half the members of a tested population after a specified test duration

The science or practice of farming, including cultivation of the soil for the growing of crops and the rearing of animals to provide food, wool, and other products

The rearing of aquatic animals or the cultivation of aquatic plants for food

A large increase in crop production in developing countries achieved by the use of fertilizers, pesticides, and high-yield crop varieties

The gradual destruction or diminution of something

An artificial application of water to the soil. It is used to assist in the growing of agricultural crops, maintenance of landscapes, and revegetation of disturbed soils in dry areas and during periods of inadequate rainfall

An irrigation method which saves water and fertilizer by allowing water to drip slowly to the roots of plants, either onto the soil surface or directly onto the root zone, through a network of valves, pipes, tubing, and ...

A method of crop irrigation in which equipment rotates around a pivot. A circular area centered on the pivot is irrigated, often creating a circular pattern in crops when viewed from above.

The group of application techniques where water is applied and distributed over the soil surface by gravity. It is by far the most common form of irrigation throughout the world and has been practiced in many areas virtually unchanged for thousands of years.

Soil salinity is the salt content in the soil.

A farm is an area of land, including various structures, devoted primarily to the practice of producing and managing food (produce, grains, or livestock), fibres and, increasingly, fuel. It is the basic production facility in food production

Open country used for grazing or hunting animals

• a farm tool having one or more heavy blades to break the soil and cut a furrow prior to sowing

The process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture

A Concentrated Animal Feeding Operations (CAFO) is an animal feeding facility confines animals for more than 45 days in an area that does not produce vegetation during the growing season and the number of animals