Quantitative Data 
Quantitative Growth
An increase in the value, number or extent of something which is readily measurable. Economically this might be GDP for a country, or turnover or profit for an organisation. From a resource perspective this can be an increase in the consumption of natural and/or artificial resources, for example, fertilisers or top-dressings. The number of users of a facility, or spectators can be related to quantitative growth, although there is a ceiling above which growth cannot continue, for example, there is a maximum capacity to a stadium, unless of course reconstruction work increases the maximum number
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Rain-fast
Some chemicals, especially pesticides, which are applied to a surface might be called rain-fast. This means that once applied they would be less likely to be washed off the leaves of vegetation after normal levels of rainfall.
Random Sampling
Each element within the subject matter (within statistics this is called a population) has an equal chance of being selected. The selection of any individual is totally independent of any other selected, or non-selected, individual.
The use of random numbers tables can assist in selecting which individual is to be included in a survey. Excel has the ability to produce random number tables.
If, for example, you had an area of 10,000m² (one hectare) with low growing vegetation and wanted to use the quadrat sampling technique. On the assumption you weren't going to use a 1m x 1m quadra
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Reduction
The loss of an oxygen molecule from a mineral and which can make it become more stable. This can also commonly result in a less red soil, as ferric oxide is converted to ferrous oxide. This is the reverse of Oxidation.
Relative Growth Rate
The quantity of plant growth which takes place over a defined amount of time for a defined quantity of vegetation. It is usually measured as growth in dry mass in relation to the current dry mass, for example increase in grams / existing mass of grams in 24 hours. A high relative growth rate is an indication of a plant's ability to more rapidly utilise a range of resources, e.g water, nutrients and light in particular.
Relative Humidity
The amount of water vapour within the air. It is expressed as a percentage of its closeness to the air being saturated. For example, where air is fully saturated it is said to be at 100% relative humidity. Lower temperatures will typically result in a rise in relative humidity because the air cannot hold as much water vapour when compared with higher temperatures. See also Dew Point.
Residual Wetting Agent
A substance which reduces surface tension within a soil profile and persists for a longer period of time than a penetrant wetting agent. These are often used as wetting agents as part of routine maintenance practices, helping to maintain a balance between water retention and water removal from a soil profile.
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Resilience
This can have several interpretations and can also be termed Resiliency.
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Resistant
Something which is less likely to be influenced or affected by an external condition. For example, some grass species are more resistant to football type wear than others.