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Fig 1. <strong>CIMMYT</strong> Maize Mega-Environment classification based on day<br />
length, mean temperature, andrainfall.<br />
Megaenvironment Day length Mean Temp. Rainfall<br />
Dry<br />
~ 200 mm<br />
Tropical Lowlands 11 ~ d 200 mm<br />
Tropical Midaltitudes 11 ~ d 200 mm<br />
Subtropical Lowlands 12.5~ d 200 mm<br />
Subtropical Midaltitudes 12.5:5 d 200 mm<br />
HighlandsfTemperate d~ 13.4 hrs or T < 18°C > 200 mm<br />
4