Some are sectioned to allow quarantining of pests. View from the glasshouses over the open top chambers towards the river Tyne. A large part of the trials area is currently dominated by the fumigation systems used tp study the effects of air pollution on plants. There are 16 open top chambers that produce controlled exposure to the pollutant gas, ozone. Inside the control hut of the fumigation system, and a view of clover plants and willow herb fumigated.
White clover is one of the most sensitive common species.