Abstract
The faba bean is among the major grain legumes cultivated in Ethiopia and is used extensively as a break crop in the highlands. Although a blanket application of DAP (diammonium phosphate) at the rate of 100 kg · ha −1 has been practised in faba bean production in the country, this was not based on research results. In addition, little information is available on the response of the crop to N and P fertilizers under diverse environmental conditions. Hence, field experiments were carried out at three locations in 1991, seven locations during 1992 and 1993 and at one location in both 1993 and 1995 to determine faba bean response to N and P fertilization. Five levels of N (0, 9, 18, 27 and 36 kg N · ha −1 as urea) in factorial combinations with four levels of P (0, 23, 46 and 69 kg P 2 O 5 · ha −1 as TSP [triple super phosphate]) were studied in a randomized complete block design with four replications in the first year. In the remaining years four levels of N (0, 18, 27 and 36 kg N · ha −1 as urea) in factorial combinations with four levels of P (0, 23, 46 and 92 kg P 2 O 5 · ha −1 as TSP) were used in a randomized complete block design with three and four replications at one and seven locations, respectively. Results indicated that a positive linear response of faba bean seed yield was noted at all locations (except Debre Zeit and Burkitu) to P fertilization, while a significant quadratic response was also found at Holetta. In addition, plant height, above ground biomass and number of pods per plant were positively influenced by P application while the effect of N on these was mostly nonsignificant. Faba bean seed yield response to N was noted at only two out of eight locations; in most cases, nonsignificant and inconsistent seed yield responses to N fertilization were obtained. There was nonsignificant N × P rate interaction. In conclusion, we do not recommend supplemental N application to faba bean at six out of eight locations but we recommend the application of P fertilizer to faba bean at almost all locations (with the exception of Debre Zeit) and for other soils deficient in available P. Further work is recommended on the determination of critical levels for soil‐available P, below which P fertilization should be practised for optimum faba bean seed yield.
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Claims 10
Claim · model-written summary
Phosphorus increased faba bean seed yield linearly at locations other than Debre Zeit and Burkitu.
- Taxon
- faba bean
Vicia fabae0 - Treatment
- P fertilizatione0
- Outcome
- seed yielde0
- Direction
- positive linear responsee0
- Setting
- all locations (except Debre Zeit and Burkitu)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a positive linear response of faba bean seed yield was noted at all locations (except Debre Zeit and Burkitu) to P fertilization”
Claim · model-written summary
Seed yield also showed a significant quadratic phosphorus response at Holetta.
- Taxon
- Faba BeanVicia fabat0
- Treatment
- Phosphorust0
- Outcome
- Yieldt0
- Setting
- Holettae0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant quadratic response was also found at Holetta”
t0“Phosphorus Effects on Faba Bean Yield”
Claim · model-written summary
Phosphorus increased plant height, aboveground biomass and pod number.
- Taxon
- faba beanVicia fabat0
- Treatment
- P applicatione0
- Outcome
- plant height, above ground biomass and number of pods per plante0
- Direction
- positively influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant height, above ground biomass and number of pods per plant were positively influenced by P application”
t0“Faba Bean”
Claim · model-written summary
Nitrogen effects on those growth and yield components were mostly nonsignificant.
- Taxon
- faba beanVicia fabat0
- Treatment
- Ne0
- Outcome
- plant height, above ground biomass and number of pods per plante1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of N on these was mostly nonsignificant”
t0“Faba Bean”
e1“plant height, above ground biomass and number of pods per plant”
Claim · model-written summary
Seed yield responded to nitrogen at only two of eight locations.
- Taxon
- Faba beanVicia fabae0
- Treatment
- Ne0
- Outcome
- seed yielde0
- Value
- two out of eight locationse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Faba bean seed yield response to N was noted at only two out of eight locations”
Claim · model-written summary
Most seed yield responses to nitrogen were nonsignificant and inconsistent.
- Taxon
- faba beanVicia fabat0
- Treatment
- N fertilizatione0
- Outcome
- seed yield responsese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in most cases, nonsignificant and inconsistent seed yield responses to N fertilization were obtained”
t0“Faba Bean”
Claim · model-written summary
The nitrogen by phosphorus rate interaction was nonsignificant.
- Taxon
- faba beanVicia fabat0
- Outcome
- N × P rate interactione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was nonsignificant N × P rate interaction”
t0“Faba Bean”
Claim · model-written summary
The authors recommend no supplemental nitrogen at six of eight locations.
- Taxon
- faba beanVicia fabae0
- Outcome
- do not recommend supplemental N applicatione0
- Value
- six out of eight locationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we do not recommend supplemental N application to faba bean at six out of eight locations”
Claim · model-written summary
The authors recommend phosphorus at nearly all locations except Debre Zeit and on other phosphorus deficient soils.
- Taxon
- faba beanVicia fabae0
- Outcome
- application of P fertilizere0
- Qualifier
- other soils deficient in available Pe0
- Setting
- Debre Zeite0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we recommend the application of P fertilizer to faba bean at almost all locations (with the exception of Debre Zeit) and for other soils deficient in available P”
Claim · model-written summary
The authors recommend determining critical soil available phosphorus levels for optimum seed yield.
- Taxon
- faba beanVicia fabae0
- Outcome
- determination of critical levels for soil‐available Pe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Further work is recommended on the determination of critical levels for soil‐available P, below which P fertilization should be practised for optimum faba bean seed yield”
The same questions in other papers
phosphorus · yield · Vicia faba (faba bean)Positive and negative results
62 papers in the same direction as this paper · 5 in the opposite direction
- negative
- no effect
- negative
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See all 68 papers →fertilization · yield · Vicia faba (faba bean)Positive and negative results
158 papers in the same direction as this paper · 17 in the opposite direction
- positive
- positive
- positive
172 papers more in this group
See all 176 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.