The flooding of paddy fields tends to reduce the need for some agrochemicals in rice farming, as this helps to prevent weed growth. However, other plant protection products – insecticides and fungicides – are used in rice farming. These must be used according to good agricultural practice, which minimises the presence of residues in the harvested crops. Any residues must fall within the stringent maximum residue limits (MRLs) established by European legislation, which are systematically monitored by national authorities. European millers also monitor their suppliers, conducting hundreds of tests every year, and It is very unusual for significant residues to be found. A survey published by the European Food Safety Authority in 2014 found two of the 1060 samples analysed not to be in conformity with EU law.