Susceptible 
Something which is likely to be influenced or affected by an external condition. For example, some grass species are more susceptible to anthracnose disease than others.
Suspension Fertiliser
A two-phase fertiliser in which solid particles are maintained in suspension in the liquid phase.
Symbiosis
1. A term used to describe the mutually beneficial relationship between two organisms living together, such as a lichen.
2. The close biological relationships between two or more organisms. Symbiosis may be categorised as:
a) Mutualism; which is beneficial to all the organisms involved, and is typical of many applications of symbiosis;
b) Commensalism; which is beneficial to one organism, but without any particular negative or positive effect on the other organism/s;
c) Parasitism; which is beneficial to one organism and detrimental to the other/s.
Systematic Sampling
An area to sample is evenly divided up into a number that represents the number of samples to be investigated. Using an example 10,000m² area and with 50 samples being required then each division would be 200m². The first (initial) sampling point is located randomly, with all subsequent points being located at an equal irregular interval from the others.
Taxon
A rank of a taxonomic group. The following taxa (which is the plural term of taxon) are widely recognised: Domain or Super Kingdom; Kingdom; Phylum (or Division); Class; Order; Family; Genus; Species. Sub-species may also sometimes be included.
Taxonomy
The scientific identification, description, naming and classification of organisms: animals, bacteria, fungi and plants. The plant (Plantae) kingdom is divided into numerous hierarchical ranks, being called a Taxon.
Temporary Wilting Point
Water transpired by a plant exceeds that which can be supplied by water in the soil resulting in wilting of a plant. This can be common feature in some sports turf situations during hot, bright, and windy summer days, especially where root growth is limited or shallow. There can often be adequate available water within a soil, however, the rate of removal from the soil cannot keep up with the need to keep a plant cool and healthy during these environmental conditions. Once normal, or less extreme, conditions prevail, especially towards the latter part of a day, then the temporary wilting point
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Thigmotropism
The response of a plant due to being touched or coming into contact with an object.
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Threshold
A level at which some action or activity is expected to be taken. In the Integrated Pest Management approach to pest control, this is called 'Action Threshold'.
Tight Cut