Crumb Fertiliser 
A fine gritty and ground material, which may be organic, such as Hoof and Horn, or Bonemeal; or inorganic such as a manufactured fertiliser. A typical size for an organic crumb fertiliser is 3mm to 4mm, going down to dust within the material. Crumb fertilisers can be added to a surface without the need for a carrier to bulk up the product, unlike powdered fertilisers. This term may also be referred to as Fertiliser Crumb.
Dicyandiamide
A nitrification inhibitor, which slows down the bacterial breakdown of ammonium to nitrate. This can be included within some fertiliser products to create a slow release nitrogen fertiliser. Didin is a registered trade name for this inhibitor.
Dolomitic Limestone
A calcium magnesium carbonate, with approximately 50% calcium carbonate and 40% magnesium carbonate. It might be used where soil pH needs to be raised above 6.0 and also where magnesium is a nutrient deficiency.
Essential Element
Essential Nutrient
A chemical which is essential for a plant to complete its life cycle and cannot be replaced by another element to carry out the same function and outcome. This is also called Essential Element.
Exchangeable Nutrients
Soil nutrients which are positively or negatively charged, and which are held on soil particles or organic matter. These nutrients, being primarily positively charged ions, can be readily exchanged with other nutrients that are in the adjoining soil solution. See also cation exchange capacity (CEC).
Extractable Nutrients
Soil nutrients which have been removed from a soil using a stated soil test method. Depending upon the method used the results can help to indicate the nutrients available to a plant.
Fertigation
The application of a soluble fertiliser through an irrigation system.
Fertiliser Action
The speed of process of how nutrients are made available to a plant, of which three actions are often identified:
• Controlled release, which is by an artificial fertiliser often with a coating which dissolves or degrades and gradually (and in theory, relatively uniformly) releases nutrients over an extended period of time, for example 3-months or greater.
• Fast release is where the nutrient. Becomes readily available to a plant, typically within 7-10 days following application. These fertilisers are usually, inorganic in origin, with an example being ammonium sulphate. Care does need to b
Continue reading about this
Fertiliser Analysis