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Paddock-
A grazing area that is a subdivision of a grazing management unit, and
is enclosed and separated from other areas by a fence or barrier
Pathogen-
An agent capable of producing disease
Particle Density (Dp)-
Mass per unit volume of soil particles and does not include the porespace. The value is expressed as g per cm3 or in SI units as Mg per cubic meter, Mg m-3.
Pasture-
A type of grazing management unit enclosed and separated from other
areas by fencing or other barriers and devoted to the production of
forage for harvest primarily by grazing.
Porosity-
The volume of bulk soil not occupied by solid particles.
Prairie-
Nearly level or rolling grassland, originally treeless, and usually
characterized by fertile soil.
Primary Consumer-
Organisms that subsists on plant material
Primary Producer-
Organisms that produces organic material from solar energy and inorganic substances e.g a photosynthetic plant.
Prizmatic-
A type of soil structure with prism-like aggregates with vertical axes longer than horizontal axes. Typically found in B horizons of Chernozemic and Solonetzic soils.
Prokaryote-
An organism whose cells do not contain nuclei. Only the bacteria are prokaryotes.
Protozoa-
Single-celled eucaryotic organisms such as amoeba
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