Expenditure

Monetary payment for goods purchased or services provided.
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Expert System

Computerised system which utilises human expert knowledge (stored in a knowledge base), along with rules (such as IF, THEN, AND), to solve problems or to provide an indication of a likely solution.
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Externality

An impact (which might be positive, but more frequently negative) that is caused by the action of someone else, who will often see a benefit (but it could be a disadvantage) from the action.
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Fall [2]

In the USA this is a term used to describe Autumn; being the time of year when the fall of leaves from deciduous trees occur.
Fallow

To leave an area of soil that has been prepared, or partly prepared, especially for seeding but also for turfing, idle for a period of time, particularly from late spring to summer.
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Fallowing

The process of leaving a soil idle: Leaving it to Fallow.
False Spring

Whilst the UK weather is quite variable there is often a short period of up to a few weeks, typically from mid-February to early March, when warmer air temperatures produce a short burst of grass growth.
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Feasibility Study

An assessment of a proposal or planned course of action to provide an indication of its likely success and practicality of implementation.
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Fertiliser Application

When a solid fertiliser (e.g. powder, granular, mini-granular, etc.) is applied to a turfgrass surface there are a number of conditions which will help ensure optimum application and evenness of spread.
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Firming

The action of consolidating a turf surface or soil to create a smooth even surface which aids root establishment.