Assessment of genotype x environment interaction on common bean (phaseolus vulgaris l.) in the southern highlands of Tanzania
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Date
2008
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Sokoine University of Agriculture
Abstract
The present study is aimed at assessing genotype x environment interaction on
common bean in Southern highlands of Tanzania. The experiment was conducted
during the season of 2006/07 in different locations, (Uyole, Mbimba, and Inyala) of
Mbeya region. Lines (main plots) SARBYT, EAI L101, CAL 143, SUG 131,
NJANO, WANJA and UYOLE 96, and 4 fertilizer levels (sub plots) were laid in
split plot in randomized complete block design with tliree replications at each
location. Plot size was 1.5m x 4.0m, with four rows of plants spaced at 50cm x 10cm.
Twelve microenvironments were used viz. a combination of three locations and four
fertilizer levels 40kg/ha P, 30kg/ha N; 70kg/ha P, 20kg/ha N; 60kg/ha P5 30kg/ha N
and Okg/ha P, Okg/ha N as a check. Genotypic differences (P < 0.05) for all traits
except yield were significant. The varieties yielded most at Uyole (2056.5kg/ha)
followed by Inyala (1551.5kg/ha) and lastly Mbimba (736.25kg/ha). At Uyole and
Mbimba fertilizer levels of (60kg/ha P, 3Okg/ha N) gave the best response, while at
Inyala fertilizer levels of (40kg/ha P, 3Okg/ha N) showed best response. Hence
fertilizer rate recommendations should be location specific. SARBYT, and EAI LI 10
had above average response with small variance of deviation from regression and
high seed yield thus could be grown in high yielding environments. SUG 131 and
NJANO had average response, small variance of deviation from regression and high
seed yield hence could be grown in wide range. NJANO and WANJA were stable fbr
flowering trait and they are earliest hence could be recommended to be grown in
marginal areas.
SARBYT and EAI L110 were least attacked by diseases. Plant
height, pods/plant, 100 seed weight and days to 80% maturity were highly correlated.
These results contribute important information about the diversity and breeding values of the bean breeding lines in the Southern Highlands of Tanzania and will be
relevant to breeders interested in bean improvement
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Masters Theses
Keywords
Genotype assessment, bean production, phaseolus vulgaris l, southern highlands Tanzania