Nutrient 
Any element which contributes to plant growth and development, especially any Macronutrient or Micronutrient.
Nutrient Assimilation
The uptake and integration of nutrients (usually just confined to mineral nutrients within a definition) into plant structures and cells. Carbon, along with hydrogen and oxygen, are assimilated through the process of photosynthesis creating carbohydrates. Nutrient uptake is primarily through plant roots, although stomatal uptake can occur, especially where foliar feeds are applied to a plant.
The extent of nutrient assimilation will be influenced by the surroundings of the plant, in particular soil conditions, such as soil pH and the abundance and availability of nutrients within the soil, t
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Nutrient Concentration
The amount of nutrient applied to a unit area or present within a defined quantity of material. For example, a fertiliser with a nitrogen content of 10% that is applied at a rate of 35g/m² has a nitrogen nutrient concentration of 3.5g/N/m². The concentration of the nitrogen within the material is 1:9 (i.e. 10% nitrogen, 90% other elements).
Nutrient Content
The amount of nutrient in a fertiliser. For example, a fertiliser with an analysis of 10:15:10 has a nutrient content of:
• 10% nitrogen.
• 15% phosphate.
• 10% potash.
Nutrient Deficiency
The concentration of a nutrient below which symptoms of deficiency occur. Deficiency symptoms are frequently observed in plant leaves, often occurring as necrosis or chlorosis.
Nutrient Excess
An oversupply in the availability or presence of a nutrient which is not needed by a plant. An excess may or may not cause any observable detriment to a plant, but where high and excessive amounts of nutrients within a soil can create conditions which are more favourable to weeds and weed grasses, making them more competitive than desirable grasses. For example, high phosphorus content can encourage clover and annual meadow grass to the detriment of perennial ryegrass in winter games pitches, or red fescue and bents in fine turf situations.
Nutrient Input
The quantity of nutrient which is supplied to a defined area. The unit area is usually expressed as m² or hectare and the quantity is determined from the application rate and the nutrient content of the fertiliser. For example, if a fertiliser has a Nitrogen content of 10% and the application rate is 35g/m², then the nutrient input is 3.5g/N/m², or 35kg/N/Ha. By contrast if a fertiliser had a particular nutrient content of 1.5% and this was applied at 25g/m², then the nutrient input is 0.375g/of nutrient/m², or 3.75kg/of nutrient/Ha.
Nutrient Solution
A water solution in which one or usually more essential nutrients have been mixed and usually dissolved, to be used as a liquid or foliar fertiliser. Nutrient solutions are often used in hydroponics.
Nutrient Sufficiency
Availability and concentration of a plant nutrient which allows for adequate, but not maximum growth, or yield. Sufficiency will depend upon the crop and context, so an agricultural crop aiming for maximum or optimum yield, will typically have a nutrient sufficiency which is much higher than that of a turfgrass plant. Nutrient sufficiency will be located between concentrations of deficiency and toxicity. This term is also called critical nutrient concentration.
Nutrient Take-up