From its origins in Mexico, maize has spread throughout the cropping world and now has the largest annual production of any cereal crop. Maize adapted to the tropics has a shorter breeding history than its temperate equivalent, and maize yields in the tropics average 46% those of temperate region...
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https://cgspace.cgiar.org/handle/10568/91727
Edmeades, G.O.
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Trevisan, W.
,
Prasanna, B.M.
,
Campos, H.
,
[Tropical maize (Zea mays L.).]
,
Tropical maize (Zea mays L.).