Field of vision means the section of the tri-dimensional space which is monitored with the help of a device for indirect vision. Unless otherwise stated, this is based on the view on ground level offered by a device and/or devices other than mirrors. This may be limited by the relevant detection distance corresponding to the critical object.
Field of Use means all fields of use.
Backflow prevention device means a safety device used to prevent pollution or contamination of the water supply due to the reverse flow of water from the irrigation system.
Wild animal means any mammal, bird, fish, or other creature of a wild nature endowed with sensation and the power of voluntary motion.
Nutrient means a chemical element or compound, such as nitrogen or phosphorus, which is essential to and promotes the development of organisms.
nanomaterial means a natural, incidental or manufactured material containing particles in an unbound state or as an aggregate or as an agglomerate and where, for 50 % or more of the particles in the number size distribution, one or more external dimensions is in the size range 1-100 nm;