Hydrated Lime

This form of lime is Calcium Hydroxide and is made by treating burnt lime with water. It is used in reducing acidity on agricultural soils but would burn grassed areas if applied to such areas. It is also known as slaked lime.

  Hydration

The adsorption of water molecules to a mineral, causing it to swell and weaken

  Hydromulch

The application of a liquefied mulch onto a soil area. It may also be applied on newly plated areas as well. This technique can be useful on relatively steep slopes and areas which are prone to erosion.

  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

See Frost 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.