Abstract
Soils in Botswana are known to be poor in phosphorus. Information is lacking on the P requirements of bambara groundnut (Vigna subterranea) in Botswana soils and soil moisture can also limit P uptake. Elsewhere the response of bambara groundnut to P fertilization is contradictory. The effects of phosphorus (P) fertilization on growth and yield of bambara groundnut were studied in a pot and a field experiments using a low P loamy sand (P-Bray 6.2 mg P kg-1) at Sebele Botswana. In the pot experiment, the response to two bambara groundnut landraces ('Diphiri Cream' and 'Zimbabwe Red') to P fertilization (0-480 mg P pot-1) was investigated. In the field experiment, the response of 'Diphiri Cream' to P fertilization (0-80 kg P ha-1) was investigated under two different soil moisture regimes (unsupplemented rainfall and supplementary irrigation) with samples taken at 28, 49,78, 99, days after sowing (DAS) and the final harvest at 126 DAS. In the pot experiment, terminated at 51 DAS, there was a positive response of shoot dry matter (DM) to P fertilization while the two landraces did not differ significantly. Root DM, nodule fresh weight and shoot P and nitrogen (N) concentrations were not affected by P fertilization. In the field, P fertilization had no effect, while supplementary irrigation increased all plant growth parameters except root DM. Total seed yield was 2.8 t and 4.2 t ha-1 for unsupplemented rainfall and supplementary irrigation treatments, respectively. Shoot P and N concentrations were not affected by soil moisture level. The positive effect of P in the pot and not in the field experiment may be an indication of low P supply of plants in pots due to a small rooted soil volume. The response in the pot experiment may indicate a 'starter P effect', whereas lack of response in the field may indicate unavailability of applied P to bambara groundnut. These aspects are discussed in this paper. UNISWA Research Journal of Agriculture, Science and Technology Vol. 4 (2) 2000: pp 202-207
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Claims 11
Claim · model-written summary
Pot phosphorus fertilisation increased shoot dry matter.
- Taxon
- bambara groundnut
Vigna subterraneae1 - Treatment
- P fertilizatione0
- Outcome
- shoot dry matter (DM)e0
- Direction
- positive responsee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was a positive response of shoot dry matter (DM) to P fertilization”
e1“bambara groundnut (Vigna subterranea)”
Claim · model-written summary
The two landraces did not differ significantly in the pot response.
- Taxon
- bambara groundnutVigna subterraneae1
- Material
- 'Diphiri Cream' and 'Zimbabwe Red'e1
- Outcome
- did not differ significantlye0
- Direction
- did not differ significantlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the two landraces did not differ significantly”
e1“two bambara groundnut landraces ('Diphiri Cream' and 'Zimbabwe Red')”
Claim · model-written summary
Pot phosphorus fertilisation did not affect root dry matter or nodule fresh weight.
- Taxon
- bambara groundnutVigna subterraneae1
- Treatment
- P fertilizatione0
- Outcome
- Root DM, nodule fresh weighte0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root DM, nodule fresh weight and shoot P and nitrogen (N) concentrations were not affected by P fertilization”
e1“bambara groundnut (Vigna subterranea)”
Claim · model-written summary
Pot phosphorus fertilisation did not affect shoot P or nitrogen concentrations.
- Taxon
- bambara groundnutVigna subterraneae1
- Treatment
- P fertilizatione0
- Outcome
- shoot P and nitrogen (N) concentrationse0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root DM, nodule fresh weight and shoot P and nitrogen (N) concentrations were not affected by P fertilization”
e1“bambara groundnut (Vigna subterranea)”
Claim · model-written summary
Field phosphorus fertilisation had no effect.
- Taxon
- bambara groundnutVigna subterraneae1
- Treatment
- P fertilizatione0
- Outcome
- no effecte0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the field, P fertilization had no effect”
e1“bambara groundnut (Vigna subterranea)”
Claim · model-written summary
Supplementary irrigation increased plant growth parameters other than root dry matter.
- Taxon
- bambara groundnutVigna subterraneae1
- Treatment
- supplementary irrigatione0
- Outcome
- all plant growth parameters except root DMe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supplementary irrigation increased all plant growth parameters except root DM”
e1“bambara groundnut (Vigna subterranea)”
Claim · model-written summary
Seed yield under unsupplemented rainfall was 2.8 t ha-1.
- Taxon
- bambara groundnutVigna subterraneae1
- Treatment
- unsupplemented rainfalle0
- Outcome
- Total seed yielde0
- Value
- 2.8 te0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total seed yield was 2.8 t and 4.2 t ha-1 for unsupplemented rainfall and supplementary irrigation treatments, respectively”
e1“bambara groundnut (Vigna subterranea)”
Claim · model-written summary
Seed yield under supplementary irrigation was 4.2 t ha-1.
- Taxon
- bambara groundnutVigna subterraneae1
- Treatment
- supplementary irrigation treatmentse0
- Outcome
- Total seed yielde0
- Value
- 4.2 t ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total seed yield was 2.8 t and 4.2 t ha-1 for unsupplemented rainfall and supplementary irrigation treatments, respectively”
e1“bambara groundnut (Vigna subterranea)”
Claim · model-written summary
Soil moisture did not affect shoot phosphorus or nitrogen concentration.
- Taxon
- bambara groundnutVigna subterraneae1
- Treatment
- soil moisture levele0
- Outcome
- Shoot P and N concentrationse0
- Direction
- not affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot P and N concentrations were not affected by soil moisture level”
e1“bambara groundnut (Vigna subterranea)”
Claim · model-written summary
The authors interpreted the pot phosphorus response as possibly reflecting restricted soil volume and a starter P effect.
- Taxon
- bambara groundnutVigna subterraneae1
- Outcome
- positive effect of P in the pote0
- Qualifier
- a small rooted soil volumee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The positive effect of P in the pot and not in the field experiment may be an indication of low P supply of plants in pots due to a small rooted soil volume. The response in the pot experiment may indicate a 'starter P effect'”
e1“bambara groundnut (Vigna subterranea)”
Claim · model-written summary
The authors suggested field nonresponse could reflect unavailable applied phosphorus.
- Taxon
- bambara groundnutVigna subterraneae0
- Outcome
- lack of response in the fielde0
- Qualifier
- unavailability of applied Pe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lack of response in the field may indicate unavailability of applied P to bambara groundnut”
The same questions in other papers
irrigation · growth · Vigna subterranea (Bambara groundnut)Results agree
1 paper in the same direction as this paper
- positive
fertilization · growth · Vigna subterranea (Bambara groundnut)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →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.