Hygroscopic 
A substance which will typically absorb moisture from the atmosphere. This is a reason why some fertilisers must be kept in dry, sealed conditions.
Hyphae
Fine threads of fungal growths by which fungi spread vegetatively, ultimately forming a network, in contrast to spreading by spores. Mycelium is the collective name for hyphae.
Ice Tolerance
Indicative
This is included within a statement when it is suggesting that something is similar to, comparable to, likely to, typical of, representative of, a point or observation being made but without a definitive confirmation of outcome. Depending on the context it can have an inferred element of doubt or uncertainty within the statement but can be considered a fair interpretation or approach for the initial purpose of general guidance.
An example might be “The condition of the pitch is indicative of one that is well maintained.” The appearance is such that the pitch looks good, however, there may
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Induced Systemic Resistance
The ability of a plant to respond to attacks and stresses from pests and diseases can be enhanced with the application of a biological or chemical inducer which helps protect, by creating a protective barrier in, areas of a plant that haven't been the primary area of attack. This response process is activated once a plant has become infected or stressed by a pathogen. Materials with beneficial microbes can be applied to plants to aid their resilience to attacks and stress from pests and disease. A build-up of beneficial microbes within the rhizosphere would occur over time thereby creatin
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Inert
A material is considered inert when it does not provide any chemical benefit or influence on its surroundings. Sand is often considered an inert material, yet it can typically contain a significant quantity of many essential plant nutrients, being able to supply most or all of required quantities of several micro-nutrients (e.g. Iron, Copper) and also significant quantities of some macro-nutrients (e.g. Calcium, Magnesium).
Infection
The penetration of a plant by an organism. For turfgrasses the main causes of infections are fungal diseases and plant parasitic nematodes. An organism which causes an infection is called a plant pathogen.
Inhibitor
An artificial substance, of which there can be many types, used for different requirements. It might slow down the activity of soil micro-organisms, in breaking down applied fertiliser nitrogen. It may inhibit a particular plant physiological process and may be especially used in inhibiting or suppressing plant growth.
Insect
An animal belonging to the taxonomic class Insecta. Insects have an outer shell (an exoskeleton), a body of three parts (head, thorax and abdomen), three pairs of jointed legs and one pair of antennae. The legs and the wings are connected to the thorax. Common turf insects are Leatherjackets and Chafers.
Instar
A development stage of arthropods, such as an insect, as it transitions through its stages of growth, after it moults (i.e. sheds its skin, or exo-skeleton). When an insect hatches from an egg it is in its first instar, after moulting it will then be in its second instar. The number of instars will vary with species.