GSR Tri-Phase 
An organic fertiliser of 18:3.5:8 + 1% MgO + Trace Elements (Cu; Zn; Bo; Mn; Mo).
It has a release rate of 16-20 weeks; a mini-granule size of 1mm-2mm and provides 3 forms of Nitrogen, including Methylene Urea. A typical application rate is 25-35 g/m². It is supplied by Germinal GB Ltd.
Guardian Fertilizer
This is a mini-granular fertiliser, with an analysis of either 6:1:12 (+2% Mg; + 2%Fe), or 12:0:9 (+1% Mg; + 1%Fe), with a typical diameter of 1mm - 2mm, being suitable for use on fine turf surfaces. They also include other nutrient and growth development additives. These fertilisers are marketed by Rigby Taylor.
H-Cote Mini
A range of mini-granular (SGN=150) controlled release fertilisers with a release period of 3-4 months. A wide range of ingredients are used in producing the fertilisers: superphosphate, ammonium sulphate, calcium sulphate dehydrate, iron sulphate, magnesium sulphate, XCU poly sulphur coated urea.
Homogenous Fertiliser
A compound fertiliser, chemically combined, which supplies a range of (macro- and micro-) nutrients, in consistent amounts, from within each granule.
Hoof and Horn Meal
An organic fertiliser supplying 12% to 14% of nitrogen. It produces similar conditions to that of Dried Blood, however, it is slower releasing, taking up to 3-months depending upon the fineness of the material. The coarser material degrades more slowly than the finely ground material. It is typically used as a mixture with dried blood, and other fertilisers. It has been shown to improve drought resistance in turfgrasses. Hoof and Horn Meal is a good complement in a mixture with Dried Blood because the latter is much quicker at releasing its nitrogen and therefore a mixture of these two fertili
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Impact CGF
A range of controlled release mini-granular fertilisers for use on turf mown at 6mm or greater. They all have a PolyC coating, with a granule size (SGN) of 140; being supplied by Indigrow.
ImpactPlus
A range of mini-granular fertilisers for use on turf mown at 2mm or greater. They all have a granule size (SGN) of 100; being supplied by Indigrow.
iNhibit
A range of controlled release fertilisers containing ammoniacal nitrogen and ureic nitrogen, with a granule size of 1.25mm, being developed for fine turf areas. These are produced by GBR Technology.
iNTrench
A make of liquid urea nitrogen fertiliser, providing a release period of from 4-10 weeks, with either added
Iron Sulphate
An inorganic fertiliser, supplying 20% to 25% of iron. It also supplies about 11% of sulphur. It is usually applied as calcined iron sulphate and is mainly used as a turf hardener, or turf tonic, and is typically applied at a rate of 4 to 6 grams per metre square. It is a major component of traditional lawn sand.
Iron sulphate acidifies the turf surface, reducing earthworm casting, weeds, algae and moss. The creation of an acidic (but not excessively acidic) surface layer can help to reduce the likelihood of some disease attacks, for example, Microdochium (Fusarium) and Take-all Patch.
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