Abstract
A multi-locational field experiment was conducted to evaluate the effects of increasing rates of nitrogen and phosphorus on sweetpotato growth and yield at Bawku and Nyankpala. Shoot yield increased by 31%, 63%, 94% and 125% in Bawku and 49%, 98%, 148% and 197% in Nyankpala, when nitrogen was applied at 30, 60, 90 and 120 kg∙ha−1, respectively. When nitrogen was applied at 30, 60, 90 and 120 kg∙ha−1, storage root yield increased by 30, 46, 48, and 37% in Bawku and by 13, 17, 14 and 3% in Nyankpala, respectively. The optimum nitrogen required to maximize storage root yield were 80 and 62.5 kg∙ha−1 for Bawku and Nyankpala, respectively, in a split application at 2 and 6 weeks after planting. Storage root yield increased by 4%, 5%, 2% and −4% in Nyankpala and by 54%, 81%, 82%, 56% in Bawku, when 40, 80, 120 and 160 kg P were applied. Optimum phosphorus required to produce the highest storage root yield in this study are 67.5 and 101.3 t∙ha−1 for Nyankpala and Bawku, respectively. The maximum net return to investment occurred when 60 kg N∙ha−1 and 40 kg P∙ha−1 were applied at Bawku and Nyankpala, respectively.
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Claims 12
Claim · model-written summary
Nitrogen rates of 30–120 kg∙ha−1 increased shoot yield by 31–125% in Bawku.
- Taxon
- sweetpotato
_Flower.jpg?width=60)
Ipomoea batatast0 - Treatment
- nitrogen was applied at 30, 60, 90 and 120 kg∙ha−1e0
- Outcome
- Shoot yielde0
- Direction
- increasede0
- Value
- 31%, 63%, 94% and 125%e0
- Setting
- Bawkue0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“Shoot yield increased by 31%, 63%, 94% and 125% in Bawku and 49%, 98%, 148% and 197% in Nyankpala, when nitrogen was applied at 30, 60, 90 and 120 kg∙ha−1, respectively.”
t0“sweetpotato”
Claim · model-written summary
Nitrogen rates increased shoot yield by 49–197% in Nyankpala.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- nitrogen was applied at 30, 60, 90 and 120 kg∙ha−1e0
- Outcome
- Shoot yielde0
- Direction
- increasede0
- Value
- 49%, 98%, 148% and 197%e0
- Setting
- Nyankpalae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot yield increased by 31%, 63%, 94% and 125% in Bawku and 49%, 98%, 148% and 197% in Nyankpala, when nitrogen was applied at 30, 60, 90 and 120 kg∙ha−1, respectively.”
t0“sweetpotato”
Claim · model-written summary
Nitrogen rates increased storage root yield by 30–48% in Bawku.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- nitrogen was applied at 30, 60, 90 and 120 kg∙ha−1e0
- Outcome
- storage root yielde0
- Direction
- increasede0
- Value
- 30, 46, 48, and 37%e0
- Setting
- Bawkue0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When nitrogen was applied at 30, 60, 90 and 120 kg∙ha−1, storage root yield increased by 30, 46, 48, and 37% in Bawku and by 13, 17, 14 and 3% in Nyankpala, respectively.”
t0“sweetpotato”
Claim · model-written summary
Nitrogen rates increased storage root yield by 3–17% in Nyankpala.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- nitrogen was applied at 30, 60, 90 and 120 kg∙ha−1e0
- Outcome
- storage root yielde0
- Direction
- increasede0
- Value
- 13, 17, 14 and 3%e0
- Setting
- Nyankpalae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When nitrogen was applied at 30, 60, 90 and 120 kg∙ha−1, storage root yield increased by 30, 46, 48, and 37% in Bawku and by 13, 17, 14 and 3% in Nyankpala, respectively.”
t0“sweetpotato”
Claim · model-written summary
The estimated optimum nitrogen rate for storage root yield was 80 kg∙ha−1 in Bawku.
- Taxon
- sweetpotatoIpomoea batatast0
- Outcome
- storage root yielde0
- Value
- 80 and 62.5 kg∙ha−1e0
- Setting
- Bawkue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimum nitrogen required to maximize storage root yield were 80 and 62.5 kg∙ha−1 for Bawku and Nyankpala, respectively, in a split application at 2 and 6 weeks after planting.”
t0“sweetpotato”
Claim · model-written summary
The estimated optimum nitrogen rate for storage root yield was 62.5 kg∙ha−1 in Nyankpala.
- Taxon
- sweetpotatoIpomoea batatast0
- Outcome
- storage root yielde0
- Value
- 62.5 kg∙ha−1e0
- Setting
- Nyankpalae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimum nitrogen required to maximize storage root yield were 80 and 62.5 kg∙ha−1 for Bawku and Nyankpala, respectively, in a split application at 2 and 6 weeks after planting.”
t0“sweetpotato”
Claim · model-written summary
Phosphorus rates increased storage root yield at 40–120 kg P but reduced it at 160 kg P in Nyankpala.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- 40, 80, 120 and 160 kg Pe0
- Outcome
- Storage root yielde0
- Direction
- increasede0
- Value
- 4%, 5%, 2% and −4%e0
- Setting
- Nyankpalae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Storage root yield increased by 4%, 5%, 2% and −4% in Nyankpala and by 54%, 81%, 82%, 56% in Bawku, when 40, 80, 120 and 160 kg P were applied.”
t0“sweetpotato”
Claim · model-written summary
Phosphorus rates increased storage root yield by 54–82% in Bawku.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- 40, 80, 120 and 160 kg Pe0
- Outcome
- Storage root yielde0
- Direction
- increasede0
- Value
- 54%, 81%, 82%, 56%e0
- Setting
- Bawkue0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Storage root yield increased by 4%, 5%, 2% and −4% in Nyankpala and by 54%, 81%, 82%, 56% in Bawku, when 40, 80, 120 and 160 kg P were applied.”
t0“sweetpotato”
Claim · model-written summary
The reported optimum phosphorus rate for storage root yield was 67.5 t∙ha−1 in Nyankpala.
- Taxon
- sweetpotatoIpomoea batatast0
- Outcome
- storage root yielde0
- Value
- 67.5 and 101.3 t∙ha−1e0
- Setting
- Nyankpalae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Optimum phosphorus required to produce the highest storage root yield in this study are 67.5 and 101.3 t∙ha−1 for Nyankpala and Bawku, respectively.”
t0“sweetpotato”
Claim · model-written summary
The reported optimum phosphorus rate for storage root yield was 101.3 t∙ha−1 in Bawku.
- Taxon
- sweetpotatoIpomoea batatast0
- Outcome
- storage root yielde0
- Value
- 101.3 t∙ha−1e0
- Setting
- Bawkue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Optimum phosphorus required to produce the highest storage root yield in this study are 67.5 and 101.3 t∙ha−1 for Nyankpala and Bawku, respectively.”
t0“sweetpotato”
Claim · model-written summary
The maximum net return occurred with 60 kg N∙ha−1 at Bawku.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- 60 kg N∙ha−1e0
- Outcome
- maximum net return to investmente0
- Setting
- Bawkue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum net return to investment occurred when 60 kg N∙ha−1 and 40 kg P∙ha−1 were applied at Bawku and Nyankpala, respectively.”
t0“sweetpotato”
Claim · model-written summary
The maximum net return occurred with 40 kg P∙ha−1 at Nyankpala.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- 40 kg P∙ha−1e0
- Outcome
- maximum net return to investmente0
- Setting
- Nyankpalae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum net return to investment occurred when 60 kg N∙ha−1 and 40 kg P∙ha−1 were applied at Bawku and Nyankpala, respectively.”
t0“sweetpotato”
The same questions in other papers
nitrogen · yield · Ipomoea batatas (sweet potato)Results differ
30 papers in the same direction as this paper · 4 in the opposite direction
- no effect
- negative
- no effect
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See all 35 papers →phosphorus · yield · Ipomoea batatas (sweet potato)Positive and negative results
18 papers in the same direction as this paper · 4 in the opposite direction
- positive
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See all 23 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.