Four Seasons of Learning and Engaging Smallholder Farmers - icrisat

Table 11-15: Release notes of the two soybean varieties released in Kenya - 2010
Tested in
NPT as
SB19
SB8
Name
Proposed
official name
for release
Year of
release
Owner
Maintainer
and seed
source
Optimal
production
altitude range
(masl)
Duration
to maturity
(months)
Grain yield
(MT/ha)
TGx DPSB 19 2010 IITA KARI/ Leldet 900 -2400 3-4 0.6 - 1.7
1740-2F
seed company
Special attributes:
• Dual purpose (high biomass, high yield and free nodulating)
• High yield , 6.53% over the mean of checks; high biomass (1.5-3.0 MT/ha)
• Rust resistant
• Nodulates with indigenous population of rhizobia in Kenya soils to fix atmospheric nitrogen
• Good for making soyabean milk
• High pod clearance (13.2 cm), hence easy to harvest using combine harvester, if necessary
• High pod load (28 pods per plant)
• Attractive creamy seed coat
• Good for intercropping
• Medium seed size
TGx DPSB 8 2010 IITA KARI / 900 -2400 4-5 0.5 -2.6
1895-
Leldet seed
33F
company
Special attributes:
• Dual purpose ( high biomass, high yield and free nodulating)
• High yield , 7.71 % over the mean of checks; - High biomass (2.5-3.0 t/ha)
• Nodulates with indigenous population of rhizobia in Kenya soils to fix atmospheric nitrogen
• Good for making soyabean milk
• High pod clearance (9.1 cm) hence easy to harvest using combine harvester, if necessary.
• High pod load 33 pods per plant
• Attractive creamy seed coat
• Good for monocropping
• Large seed size
In Mozambique, significant differences were obtained among the new lines in the 2009/10 multilocation
trials at Ruace, Nampula and Domue (Table 11-19). Average location yield at Ruace was 4031 kg per
ha whilst it was 1407 kg per ha and 1692 kg per ha at Nampula and Domue, respectively. At Ruace,
the top grain yield of 4960 kg per ha was obtained from TGx 1485-1D, followed by TGx 1972-1F with
4930 kg per ha. The check variety (Storm) gave 4159 kg per ha. In general, Ruace is a high potential
area for soybean cultivation as yields of all the test genotypes ranged from 3154 kg per ha to 4960 kg
per ha. At Nampula the highest yield of 2037 kg per ha was obtained from TGx 1937-1F, followed by
TGx 1987-38F with 1994 kg per ha whereas the check variety Storm gave a grain yield of 971 kg per
ha, which was the second highest yield from the bottom. At Domue (Tete province), TGx 1987-38F
gave the highest grain yield of 2475 kg per ha, followed by TGx 1987-62F (2465 kg per ha). At this
location the yield of Storm was the lowest (668 kg per ha). Across locations, the best performers were
TGx 1987-38F, TGx 1987-20F and TGx 1987-62Fwhereas Storm was the least performer as compared
to the test genotypes.
In western Kenya, the new breeding lines showed excellent performance in 2010 (Table 11-20).
Significant differences among lines were obtained from Sidada and Kokare sites. Location mean yields
were higher at Sidada (2785 kg per ha) as compared to Kokare (1003 kg per ha). All the new breeding
lines surpassed the local check (Nyala) at Sidada. The top yielders were TGx 1987-18F (3287 kg per
ha), TGx 1987-20F (3200 kg per ha) and TGx 1987-65F (3167 kg per ha). At Kokare, TGx 1987-18F,
TGx 1987-32F and TGx 1987-20F were top yielders with a respective yields of 1963 kg per ha, 1856 kg
per ha, and 1845 kg per ha. These new breeding lines also showed resistance to rust at these locations.
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Engaging Smallholder Farmers | Tropical Legumes II Project