Abstract
ABSTRACT Sweet potato yields in Brazil are well below the crop’s potential due to inadequate soil fertility and fertilization management. This study aimed to evaluate the effect of phosphate fertilizer on sweet potato yield and nutrition under field conditions. Five rates of P2O5 (0, 100, 200, 400 and 600 kg ha−1) were evaluated in areas of Humic Cambisol, in two cropping seasons. The maximum technical efficiency (38.5 t ha−1) occurred with a rate of 380 kg ha−1 of P2O5, and the economic optimum rate with 121 kg ha−1 of P2O5, corresponding to the marketable yield of 33.3 t ha−1. The sweet potato’s response to the phosphate fertilizer application in Humic Cambisol decreases or ceases if the available P level is higher than 13 mg dm−3, corresponding to the marketable yield of 37.7 t ha−1. The increase in the P2O5 rates in the soil resulted in a negative correlation between P and Fe, P and B, P and Cu, and P and Zn in the shoot, and a negative correlation between P and K in the shoot, storage root and whole plant.
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Claims 5
Claim · model-written summary
Maximum technical yield was 38.5 t ha−1 at 380 kg ha−1 P2O5.
- Taxon
- Sweet potato
_Flower.jpg?width=60)
Ipomoea batatast0 - Treatment
- 380 kg ha−1 of P2O5e0
- Outcome
- maximum technical efficiencye0
- Direction
- maximume0
- Value
- 38.5 t ha−1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“The maximum technical efficiency (38.5 t ha−1) occurred with a rate of 380 kg ha−1 of P2O5, and the economic optimum rate with 121 kg ha−1 of P2O5, corresponding to the marketable yield of 33.3 t ha−1.”
t0“Sweet potato”
Claim · model-written summary
Economic optimum P2O5 rate was 121 kg ha−1, yielding 33.3 t ha−1 marketable roots.
- Taxon
- Sweet potatoIpomoea batatast0
- Treatment
- 121 kg ha−1 of P2O5e0
- Outcome
- marketable yielde0
- Direction
- optimume0
- Value
- 33.3 t ha−1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum technical efficiency (38.5 t ha−1) occurred with a rate of 380 kg ha−1 of P2O5, and the economic optimum rate with 121 kg ha−1 of P2O5, corresponding to the marketable yield of 33.3 t ha−1.”
t0“Sweet potato”
Claim · model-written summary
Phosphate response decreased or ceased above 13 mg dm−3 available P, at 37.7 t ha−1 marketable yield.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- phosphate fertilizer applicatione0
- Outcome
- marketable yielde0
- Direction
- decreases or ceasese0
- Value
- 37.7 t ha−1e0
- Qualifier
- available P level is higher than 13 mg dm−3e0
- Setting
- Humic Cambisole0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sweet potato’s response to the phosphate fertilizer application in Humic Cambisol decreases or ceases if the available P level is higher than 13 mg dm−3, corresponding to the marketable yield of 37.7 t ha−1.”
Claim · model-written summary
Higher P2O5 rates correlated negatively with shoot Fe, B, Cu, and Zn relative to P.
- Taxon
- Sweet potatoIpomoea batatast0
- Organ / stage
- shoote0
- Treatment
- increase in the P2O5 ratese0
- Outcome
- negative correlation between P and Fe, P and B, P and Cu, and P and Zne0
- Direction
- negative correlatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase in the P2O5 rates in the soil resulted in a negative correlation between P and Fe, P and B, P and Cu, and P and Zn in the shoot, and a negative correlation between P and K in the shoot, storage root and whole plant.”
t0“Sweet potato”
Claim · model-written summary
Higher P2O5 rates correlated negatively with P versus K in shoots, storage roots, and whole plants.
- Taxon
- Sweet potatoIpomoea batatast0
- Organ / stage
- shoot, storage root and whole plante0
- Treatment
- increase in the P2O5 ratese0
- Outcome
- negative correlation between P and Ke0
- Direction
- negative correlatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase in the P2O5 rates in the soil resulted in a negative correlation between P and Fe, P and B, P and Cu, and P and Zn in the shoot, and a negative correlation between P and K in the shoot, storage root and whole plant.”
t0“Sweet potato”
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See all 16 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.