GAP means "Good Agricultural Practices" (see http://en.wikipedia.org/wiki/Good_agricultural_practices ). The table below summarizes the most important GAP practices.
The farm site
The farm must not have been previously contaminated.
The farm
There must be systems in place to ensure that cleanliness is ensured on the whole farm.
Intruders must be kept out of the fields.
Waste must be removed.
Toilets must be available for workers.
The fields
There must be systems in place to ensure that cleanliness is ensured on the fields.
The soils cannot have heavy metals.
Records must be kept showing what was used for growing.
The waters must be clean.
Run-off, sewage, litter must be disposed of in an environmentally safe manner.
Pesticides, fertilizers and agrochemicals
The products used must be:
Approved
Used by trained workers
Applied properly
Recorded
Stored properly
Disposed of properly
Pest & Disease Management
An Integrated Pest Management (IPM) strategy must be in place.
Pest & Disease threats must be identified by regular observations.
All responses to threats must be appropriate.
All responses to threats must be documented.
All staff must be trained in IPM.
All IPM equipment must be properly used.