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Fig 1. CIMMYT Maize Mega-Environment classification based on day length, mean temperature, andrainfall. Megaenvironment Day length Mean Temp. Rainfall Dry ~ 200 mm Tropical Lowlands 11 ~ d 200 mm Tropical Midaltitudes 11 ~ d 200 mm Subtropical Lowlands 12.5~ d 200 mm Subtropical Midaltitudes 12.5:5 d 200 mm HighlandsfTemperate d~ 13.4 hrs or T < 18°C > 200 mm 4
How can the results be used ... .... byNationalAgriculturalResearch Programs? »- Request seed of the very best stress-tolerant, responsive OPV's and (tripleand double-cross) hybrids from CIMMYT, other National Programs, and private seed companies, and further test them in the National Maize Evaluation Trials. »- Conduct National Maize Evaluation Trials not only under optimal conditions but also under the most important stresses present in farmers' fields. Consider performance under stress conditions and farmers' preferences when making decisions on release ofgermplasm. »- Request and use seed of best CIMMYT germplasm (inbred lines, OPV's) in your breeding program . .... byPrivate Seed Companies? »- Foster the distribution of cultivars that are not only high yielding under optimal conditions but as well under the most important stresses present in farmers' fields. »- Continue to submit seed ofyour best germplasm for evaluation in Regional Trials (to CIMMYT) and/or National Maize Evaluation Trials (to National Agricultural Research Programs of individual countries). »- Request and use seed of best CIMMYT germplasm (inbred lines, OPV's) in your breeding program and for commercialization. .... byseed-distributing agencies? }> Use data from Regional Trials (available from CIMMYT-Zimbabwe) and National Maize Evaluation Trials (available from National Agricultural Research Programs of individual countries) for making decisions on which seed to distribute to farmers. ,. Distribute quality seed of the very best stress-tolerant, responsive hybrids and OPV's that are currently available. Conclusion: Foster the availability and distribution of quality seed of the very best maize cultivars, those that are not only high yielding under optimal conditions but as well under the stresses present in farmers fields. 5
Page 2 and 3: CIMMYT The International Maize and
Page 4 and 5: 1. Introduction ~ The trials evalua
Page 8 and 9: 0-, Eotry ..&dIg.... Origin Acrc:ll
Page 10 and 11: 00 Entry Pedigree OrigIn AcroM G..f
Page 12 and 13: EIHYB99 Results of early and Inferm
Page 14 and 15: IlHYB99 Results of mlermoolalO and
Page 16 and 17: OrigllJ Across Grain yield RelGY Ra
Page 18 and 19: % Avg Sldev llha Rank IIha Ran'" II
Page 20 and 21: ~tltry PedJ!lree Across Gr-aln yiel
Page 22 and 23: ~ ,.. • ~~ • "~- - -- .- EIlUY
Page 24 and 25: Enll)l P.dls.... Across I Drought.t
Page 26 and 27: Entry l'ildlgree Across Grain yield
Page 28 and 29: Enlly Pedigree I Across Grain yield
Page 30 and 31: ·.; Across Grain yield ... Lowland
Page 32 and 33: E1HV899: Resul~ 01 early .1nd Inter
Page 34 and 35: ... ~ PedIg... Across N stress Drou
Page 36 and 37: _~ PAl\i133'~ IlHYB!l'9 ROhlll\..-
Page 38 and 39: - OnIOnyIoId._"- Oroughl sir••
Page 40 and 41: Leaf rolling Senescence Anthesis-si
Page 42 and 43: Trial classification Country Site C
Page 44 and 45: .j>. tv South Africa Tanzania Tanza

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