Abstract
Sequential sowings were carried out at Dodoma, Tanzania, to examine the effect of changing climatic parameters on the growth and yield of bambara groundnut ( Vigna subterranea ). Sowings took place on 4 January, 4 February and 4 March 1994; 4 and 24 January, and 13 February 1995; 4 and 21 January, and 7 February 1996. Rainfall during the crop life cycle varied from 163 to 611 mm, mean photoperiod from 11.82 to 12.09 h d −1 and mean temperature from 22.6 to 24.4 °C. In 1994, the highest pod yields were achieved at the earliest sowing date, with a maximum of 2.87 and 1.42 t ha −1 for the red- and cream-seeded landraces, representing pod harvest indices of 0.56 and 0.34 respectively. A 30-d delay in sowing caused >60% reduction in pod yield, and a further 30-d delay resulted in no pods at all. Similarly, in 1995 successive delays in sowing caused dramatic yield declines, and the maximum yield was much lower, at 0.44 t ha −1 . In 1996 there was no significant difference in pod yields between the two early sowing dates for the red-seeded landrace and yields were again lower than in 1994 with a maximum of 1.02 t ha −1 . Differences in dry matter production between sowings and years were attributed mainly to differences in the amount and distribution of rainfall and to declining temperatures towards the end of the season; however, partitioning to pods was remarkably consistent across sowings.
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Claims 13
Claim · model-written summary
In 1994 the earliest sowing gave the highest pod yields in both landraces.
- Taxon
- bambara groundnut
Vigna subterraneat0 - Treatment
- earliest sowing datee0
- Outcome
- pod yieldse0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1994, the highest pod yields were achieved at the earliest sowing date”
t0“BAMBARA GROUNDNUT”
Claim · model-written summary
The red-seeded landrace reached a maximum pod yield of 2.87 t ha −1 in 1994.
- Taxon
- bambara groundnutVigna subterraneat0
- Material
- red-e0
- Outcome
- maximume0
- Direction
- maximume0
- Value
- 2.87e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a maximum of 2.87 and 1.42 t ha −1 for the red- and cream-seeded landraces”
t0“BAMBARA GROUNDNUT”
Claim · model-written summary
The cream-seeded landrace reached a maximum pod yield of 1.42 t ha −1 in 1994.
- Taxon
- bambara groundnutVigna subterraneat0
- Material
- cream-seedede0
- Outcome
- maximume0
- Direction
- maximume0
- Value
- 1.42 t ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a maximum of 2.87 and 1.42 t ha −1 for the red- and cream-seeded landraces”
t0“BAMBARA GROUNDNUT”
Claim · model-written summary
The red-seeded landrace had a 1994 pod harvest index of 0.56.
- Taxon
- bambara groundnutVigna subterraneat0
- Outcome
- pod harvest indicese0
- Value
- 0.56e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“representing pod harvest indices of 0.56 and 0.34 respectively.”
t0“BAMBARA GROUNDNUT”
Claim · model-written summary
The cream-seeded landrace had a 1994 pod harvest index of 0.34.
- Taxon
- bambara groundnutVigna subterraneat0
- Outcome
- pod harvest indicese0
- Value
- 0.34e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“representing pod harvest indices of 0.56 and 0.34 respectively.”
t0“BAMBARA GROUNDNUT”
Claim · model-written summary
Delaying sowing 30 days reduced pod yield by more than 60%.
- Taxon
- bambara groundnutVigna subterraneat0
- Treatment
- 30-d delay in sowinge0
- Outcome
- pod yielde0
- Direction
- reductione0
- Value
- >60%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 30-d delay in sowing caused >60% reduction in pod yield”
t0“BAMBARA GROUNDNUT”
Claim · model-written summary
A further 30-day sowing delay resulted in no pods.
- Taxon
- bambara groundnutVigna subterraneat0
- Treatment
- a further 30-d delaye0
- Outcome
- no pods at alle0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a further 30-d delay resulted in no pods at all.”
t0“BAMBARA GROUNDNUT”
Claim · model-written summary
Successive sowing delays in 1995 caused large yield declines.
- Taxon
- bambara groundnutVigna subterraneat0
- Treatment
- successive delays in sowinge0
- Outcome
- yielde0
- Direction
- declinese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 1995 successive delays in sowing caused dramatic yield declines”
t0“BAMBARA GROUNDNUT”
Claim · model-written summary
Maximum 1995 pod yield was 0.44 t ha −1.
- Taxon
- bambara groundnutVigna subterraneat0
- Outcome
- yielde0
- Direction
- much lowere0
- Value
- 0.44 t ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the maximum yield was much lower, at 0.44 t ha −1”
t0“BAMBARA GROUNDNUT”
Claim · model-written summary
In 1996 the red-seeded landrace had no significant pod yield difference between the two early sowings.
- Taxon
- bambara groundnutVigna subterraneat0
- Material
- red-seeded landracee0
- Treatment
- two early sowing datese0
- Outcome
- pod yieldse0
- Direction
- no significant differencee0
- Comparator
- two early sowing datese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1996 there was no significant difference in pod yields between the two early sowing dates for the red-seeded landrace”
t0“BAMBARA GROUNDNUT”
Claim · model-written summary
The maximum 1996 yield was 1.02 t ha −1 and was below the 1994 yield.
- Taxon
- bambara groundnutVigna subterraneat0
- Outcome
- yieldse0
- Direction
- lowere0
- Value
- 1.02 t ha −1e0
- Comparator
- 1994e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yields were again lower than in 1994 with a maximum of 1.02 t ha −1”
t0“BAMBARA GROUNDNUT”
Claim · model-written summary
The authors attributed dry matter differences among sowings and years mainly to rainfall distribution and late-season cooling.
- Taxon
- bambara groundnutVigna subterraneat0
- Outcome
- Differences in dry matter productione0
- Qualifier
- differences in the amount and distribution of rainfall and to declining temperatures towards the end of the seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences in dry matter production between sowings and years were attributed mainly to differences in the amount and distribution of rainfall and to declining temperatures towards the end of the season”
t0“BAMBARA GROUNDNUT”
Claim · model-written summary
Partitioning to pods was remarkably consistent across sowings.
- Taxon
- bambara groundnutVigna subterraneat0
- Outcome
- partitioning to podse0
- Direction
- remarkably consistente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“partitioning to pods was remarkably consistent across sowings.”
t0“BAMBARA GROUNDNUT”
The same questions in other papers
sowing time · yield · Vigna subterranea (Bambara groundnut)Results agree
1 paper in the same direction as this paper
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.