mesopores The pores in soil filled with water between field capacity and wilting point. See also micropores and macropores.

mesotrophic Used in reference to a moderate amount of nutrients in water.

metal halide lamp A lamp that uses an electric current to produce a light from a metal vapor such as mercury or sodium.

metal leaf A thin coating of silver, gold, etc. to improve the appearance of a material.

metallophytes Plants that preferentially colonize in soils rich with metals.

metal-organic complex See chelate.

metastability See conditional stability.

meter, metre (m) An International Standard measurement unit of length equal to 39.37 in or 10 dms.

metes and bounds Description of property (land parcels) using measurements of distances and bearings in delineating and establishing edges, boundaries, or limits.

methyl bromide A chemical soil sterilant often sold in cans under pressure. This is a dangerous gas that must be used and handled with care.

metre See meter.

metric ton (t) A metric weight of 1000 kilograms, 1,000,000 grams, 1.102 U.S. tons (short tons), or about 2205 pounds.

metropolitan planning organization A

local government having legal jurisdiction over a city area for land planning, transportation, and land uses.

metropolitan statistical area An area established by the Bureau of Census for a county with a central city or adjoining central cities totaling 50,000 or more in population, and the surrounding suburbs that are strongly linked economically and socially.

Mg Abbreviation for megagram (s).

mg Abbreviation for milligram (s).

mgph Abbreviation for thousand gallons per hour.

mh, m.h. 1. Abbreviation for manhole. 2. Abbreviation for metal halide. 3. Abbreviation for man-hour.

m/hr, m.h. Abbreviation for man-hour.

mi2 Abbreviation for square mile(s).

micro- A Greek prefix, meaning small, or male, often used in botanical terms.

microclimate A reference to a fertilizer that is hardened into the shape of a stake so that it may be forced into the ground. It decomposes, and some materials leach, acting much the same as a fertilizer tablet. Any change in climatic conditions such as wind, sunlight/shade, temperature, humidity, etc. in a relatively small, distinctly different area or locality, as affected by man-made or natural elements such as buildings surrounding a city street, a hill protecting from wind or hot late afternoon sun, plants affording shade, a water body affording an increase in humidity, etc. Microclimates are created on each side of a

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