Land under cereal production refers to harvested area, although
some countries report only sown or cultivated area. Cereals
include wheat, rice, maize, barley, oats, rye, millet, sorghum,
buckwheat, and mixed grains. Production data on cereals relate
to crops harvested for dry grain only. Cereal crops harvested
for hay or harvested green for food, feed, or silage and those
used for grazing are excluded. Food and Agriculture
Organization, electronic files and web site.