Posts Tagged ‘Kiboko’

Performance and yield stability of maize hybrids in stress-prone environments in eastern Africa

Posted on , November 17, 2019

Identification and deployment of high-yielding and stress-tolerant maize hybrids adapted
to stress-prone agro-ecologies is important for improving the food security and livelihoods
of smallholder farmers in eastern Africa.

The objectives of this study were to (i) assess the performance of maize hybrids under well-watered and drought stress conditions; (ii) evaluate grain yield stability of 65 intermediate-maturing and 55 early-maturing hybrids in 24 well-watered locations and seven drought stress locations; and (iii) identify representative and/or discriminative testing locations for increasing genetic gains for the target traits.

There were significant differences for grain yield among early- and intermediate maturing
hybrids tested under well-watered and drought stress environments. Among the early-maturing hybrids, the top 10 hybrids produced 46.8%–73.9% and 31.2%–42.1% higher mean grain yields than the best commercial check under drought and well-watered
conditions, respectively. Among the intermediate-maturing hybrids, the top 10 hybrids
produced 25.2%–47.7% and 8.5%–13.5% higher grain yield than commercial checks under
drought stress and well-watered conditions, respectively, suggesting improvement in the
levels of drought tolerance in both early- and intermediate-maturing hybrids.

GGE biplot analysis and a bi-segmented regression linear method identified specific early-maturing
and intermediate-maturing hybrids that performed well under both well-watered and
drought stress conditions. These hybrids could be recommended for commercial
production in eastern Africa.

Kakamega in Kenya was found to be the most representative and highly discriminating site among well-watered testing locations, while Kabuku in Tanzania was the least representative of test locations.

For testing under drought stress conditions, Kiboko in Kenya was identified as the most representative location. This information could be useful for allocating resources and streamlining CIMMYT maize hybrid testing in eastern Africa.

Scoring new drought tolerant CIMMYT lines in Kiboko 5 Sept 2019

Posted on Activities, Eastern Africa News, galleries, Media&Stories, PhotoStories, Research News, September 12, 2019

CIMMYT breeders selecting new CIMMYT line candidates in stage 4, scoring hybrid entries according to their drought tolerance in Kiboko research station – 5 September 2019

CIMMYT breeders scoring DT maize in Kiboko 5 September 2019
CIMMYT breeders scoring DT maize in Kiboko 5 September 2019
CIMMYT breeder scoring DT maize in Kiboko
CIMMYT breeder scoring DT maize in Kiboko
Suresh and Aparna ranking DT maize entries in Kiboko 5 Sept 2019
Suresh and Aparna ranking DT maize entries in Kiboko 5 Sept 2019
Cob not well covered by husk is prone to attacks Kiboko Sept 2019
Cob not well covered by husk is prone to attacks Kiboko Sept 2019
Stay green entry 52 DT maize in Kiboko
Stay green entry 52 DT maize in Kiboko 5 Sept 2019
Entry 42 DT maize cob in Kiboko
Entry 42 maize cob in Kiboko
Entry 42 during CIMMYT DT line evaluation in Kiboko Sept 2019
Checking grain filling in DT maize cob in Kiboko Sept 2019
Checking grain filling in DT maize cob in Kiboko Sept 2019
Staygreen late maturity hybrid in Kiboko Sept 2019
Staygreen late maturity hybrid in Kiboko Sept 2019
a good low N maize hybrid
Good low N maize hybrid in Kiboko
Comparison between maize that respond well to low N and commercial check
Comparison between good and bad low N maize
Shelling Low N maize cobs in Kiboko for yield measurement
Shelling low N maize cobs in Kiboko
Weighing low N maize trial
weighing low N maize trial
Close tip Maize cob in CIMMYT DT line evaluation in Kiboko
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