All terms

 

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Feldspar

Group of hard crystalline minerals that consist of aluminum silicates of sodium or calcium or barium.

Fen

Flat and swampy land, usually low in altitude and similar to a bog or marsh.

Fertigation

Special form of fertilization where nutrients are supplied dissolved in the irrigation water.

Fertilization

Application of mainly mineral compounds, in order to increase soil fertility. In some cases, (e.g. liming) the purpose of fertilization is also to improve specific soil properties (pH, stability of soil structure).

Fertilizer

Substance used in agriculture to provide crops with vital nutrients to grow (such as Nitrogen (N), Phosphorus (P), Potassium (K) and lime).

Fertilizer replacement value

The extent to which a nutrient (N, P) in a manure or in a compost is as plant-available as that nutrient in a common mineral equivalent applied according to good agricultural practices, usually expressed as kg per 100 kg applied = fertilizer equivalency = ratio of apparent recoveries* (or of apparent efficiencies**) of a nutrient (often N) from manure and from a commonly used mineral fertilizer equivalent.

Field capacity

The moisture condition where a soil contains the maximum amount of water that it can hold against gravity, and where further wetting will result in drainage. Following saturation, soils typically return to field capacity, when the rate of downward movement of water has substantially decreased, usually 1-3 days after rain or irrigation after the gravitational, or free, water has drained away. It is typically expressed as a mass or volume fraction of soil water or as a soil moisture deficit (SMD) of zero. It is the water content retained at low suctions (5-33kPa) depending on soil type, and is the upper limit of plant available water.

Fine texture

(i) A broad group of textures consisting of, or containing, large quantities

Flooding

Inundation of land beside a watercourse, as a result of an excessive water table. This may incur addition of sediment onto the land surface as well as water

Fluvioglacial deposits

Material moved from the margins of glaciers and subsequently sorted and deposited by streams flowing from the melting ice.

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