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Agrichemicals are defined in NZS8409 as plant protection products (herbicides, insecticides, fungicides), veterinary medicines, fumigants used in rural situations and agricultural use of detergents and sanitizers except those use in dairying.  This manual does not cover fumigants but does provide a little information in relation to dairy detergents.

Knowing how agrichemicals and additives work helps you understand the risks associated with them. For example, a product designed to penetrate the waxy cuticle of a leaf is likely to be more easily absorbed through human skin.