Altitude and Environmental Responses of Entries in the 1972-73 Eastern African Maize Variety Trial

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Darrah, L.L.
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Regional maize (Zea mays L.) variety trials provided a means of assessing gains in yield potential and adaptation of breeding populations over a range of altitudes and environments. Such trials allow existing commercial hybrids and varieties to be compared with experimental ones. Results from past trials [1, 6] have showed that Kenya's hybrids 512 and 632 and Zambia's hybrid SR52 were well adapted to environments that ranged from 0.9 to 1.6 km above sea level. Kenya's hybrids 611C and 613B were superior at altitudes above 1.6 km. The mean response to altitude in the 1968-69 Eastern African Maize Variety Trial (EAMVT) [6] was 17 q/ha/km, whereas in the 1970-71 EAMVT it was 13 q/ha/km [1]. Adaptation was related to altitudinal and environmental responses that were greater for varieties and hybrids selected at or originating from high altitudes.
East African Agricultural And Forestry Journal, 41 (No. 4), p. 273-288