Sustainable Soil Management
Glossary
D
DEEP TILLAGE. Tillage deeper than that needed to produce loose soil for a seedbed, usually used to loosen compacted subsoil.
DENRIFICATION. The transformation of nitrates or nitrites to nitrogen or nitrogen oxide gas, occurring under anaerobic conditions.
DIAMMONIUM PHSPHATE (DAP). Fertilizer containing both nitrogen and phosphorus with an analysis of 18-46-0.
DIFFUSION. The movement of particles from an area of higher concentration to an area of lower concentration.
DISCHARGE. Flow of surface water in a stream or the flow of ground water from a pipe, spring, ditch, or flowing artesian well.
DOLOMITIC LIME. A naturally occurring liming material composed chiefly of carbonates of magnesium and calcium.
DRAINAGE. Rate and amount of water removal from soil by surface or sub-surface flow.
DRYLAND FARMING. The practice of crop production in low-rainfall areas without irrigation.
