I assume the Deputy is referring to controls on fertiliser used in the production of food crops. My responsibility in this regard is concerned with the labelling and marketing of fertilisers. Official samples of fertilisers held at manufacturers' and retailers' premises are routinely taken by my Department's inspectors. The samples are analysed to determine whether the material complies with the statutory requirements in relation to the levels of nutrients present. It is also a requirement that the labels comply with EU and national legislation. In regard to the use of fertilisers, advice is provided to farmers by Teagasc on the appropriate level, type and application.