Mesopore 
Intermediate sized soil pores ranging from 0.005mm to either 0.05mm or 0.075mm in diameter, depending on how it is classified. These are also termed Storage Micropores as they retain water that is available for a plant.
Micropore
Small soil pores typically found within soil aggregates. Water does not drain naturally from micropores (as natural drainage to field capacity occurs with macro-pores) and can be considered as being those which retain water and which are gradually depleted of water as this is used by plants via evapo-transpiration. The classification size of a micropore can vary, being less than 0.075mm, or 0.05mm, in diameter; to no smaller than 0.0002mm for what are termed Storage Micropores or Mesopores; whilst any micropore less than 0.0002mm is classed as a Residual Pore and the water retained in these is
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Moder
An intermediate type of humus, between Mor and Mull. It has intermediate levels of biological activity and a slightly acidic soil condition, with the organic horizon of the soil profile typically having distinct layers of Litter (at the surface), overlying a Fermentation layer.
Mole Channel
A hollow horizontal drainage channel produced by the action of a mole plough.
Mole Drainage
A method of drainage which can be used on heavy clay soils with greater than 35% clay and less than 30% sand content. It is a primary drainage system in which the created drainage channels run into a permanent drainage trench, which is typically located at the edge of a field. The trench will typically have a pipe installed to help transport the drainage water away to an outfall.
Mor
A type of humus, which is created under acidic conditions, with low microbiological soil activity. The breakdown of this type of humus is relatively slow, with the organic horizon of the soil profile typically having distinct layers of Litter (at the surface), Fermentation, and Humus.
Motty
A ball of clay moulded and compressed to approximately 25mm in diameter, which is formed from a clay loam. It is dried, shrinks to about 20mm in diameter, and then broken to measure its binding strength in kilograms. More formally it is called the Adams and Stewart Soil Binding (ASSB) test after its inventors. A good binding strength for a cricket loam will typically be from 55kg for good club pitches and better; whilst for tennis courts this will be greater than 35kg.
Mull
A type of humus which is present in many soil types which are biologically active, with the soil pH being around neutral, and especially under grassland conditions. The O horizon is primarily a Litter layer, with organic material being well mixed into the mineral soil A horizon.
Natural Drainage
The natural removal of water from a surface without the use of an installed drainage system or specially constructed pitch profile. A slope on a surface will allow water to drain naturally in the direction of the slope, whilst a soil with good soil structure or an open texture will also provide for good natural drainage.
Neutral Soil