Abstract
The sweet potato is a vegetable with potential for expansion of its production area, due to its versatility of use, as it can be used as food, feed and biofuel. However, there is limited information on the mineral nutrition and performance of this vegetable in response to fertilization, especially phosphorus, which is a nutrient with strong interaction with the soil. Given the above, the aim of the present study was to evaluate phosphorus fertilizer levels on growth, mineral nutrition and sweet potato productivity. An experiment carried out from September 3, 2011 until January 3, 2012, in São Luis-MA, aimed to evaluate phosphorus fertilizer levels on growth, mineral nutrition and productivity of sweet potato plants. The experimental design was a completely randomized blocks with four replications. Harvest took place 123 days after seedling transplantation. Phosphorus doses influenced the P level in the soil, plant aerial and root dry matter, total and commercial productivities, and the accumulation of P in the plant aerial part dry matter, tuberous roots and the total plant. The foliar P content was verified to follow a linear adjustment to the doses of P2O5 whereas total and commercial productivities of roots followed a quadratic adjustment. Maximum productivity (1.68 kg m-2) resulted when the P2O5 dose was 191 kg ha-1. The optimal economical dose was 104 kg P2O5 ha-1, that is, 54% of the dose that resulted in the highest commercial productivity.
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Claims 9
Claim · model-written summary
Foliar P content followed a linear adjustment to P2O5 doses in sweet potato.
- Taxon
- sweet potato
_Flower.jpg?width=60)
Ipomoea batatast0 - Treatment
- doses of P2O5e1
- Outcome
- foliar P contente1
- Qualifier
- linear adjustmente1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
t0“yield of sweet potato”
e1“The foliar P content was verified to follow a linear adjustment to the doses of P2O5”
Claim · model-written summary
Total and commercial root productivities followed a quadratic adjustment to P2O5 doses.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- doses of P2O5e1
- Outcome
- total and commercial productivities of rootse2
- Qualifier
- quadratic adjustmente2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield of sweet potato”
e1“The foliar P content was verified to follow a linear adjustment to the doses of P2O5”
e2“total and commercial productivities of roots followed a quadratic adjustment”
Claim · model-written summary
Maximum productivity of 1.68 kg m-2 occurred when the P2O5 dose was 191 kg ha-1.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- P2O5 dose was 191 kg ha-1e3
- Outcome
- Maximum productivitye3
- Direction
- Maximume3
- Value
- 1.68 kg m-2e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield of sweet potato”
e3“Maximum productivity (1.68 kg m-2) resulted when the P2O5 dose was 191 kg ha-1”
Claim · model-written summary
The optimal economical P2O5 dose for sweet potato was 104 kg ha-1.
- Taxon
- sweet potatoIpomoea batatast0
- Outcome
- optimal economical dosee4
- Value
- 104 kg P2O5 ha-1e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield of sweet potato”
e4“The optimal economical dose was 104 kg P2O5 ha-1”
Claim · model-written summary
The optimal economical dose was 54% of the dose that gave the highest commercial productivity.
- Taxon
- sweet potatoIpomoea batatast0
- Outcome
- optimal economical dosee4
- Value
- 54%e5
- Qualifier
- of the dose that resulted in the highest commercial productivitye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield of sweet potato”
e4“The optimal economical dose was 104 kg P2O5 ha-1”
e5“that is, 54% of the dose that resulted in the highest commercial productivity”
Claim · model-written summary
Phosphorus doses influenced the P level in the soil.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- Phosphorus dosese6
- Outcome
- P level in the soile6
- Direction
- influencede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield of sweet potato”
e6“Phosphorus doses influenced the P level in the soil”
Claim · model-written summary
Phosphorus doses influenced plant aerial and root dry matter.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- Phosphorus dosese6
- Outcome
- plant aerial and root dry mattere7
- Direction
- influencede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield of sweet potato”
e6“Phosphorus doses influenced the P level in the soil”
e7“plant aerial and root dry matter”
Claim · model-written summary
Phosphorus doses influenced P accumulation in the plant aerial part dry matter, tuberous roots and total plant.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- Phosphorus dosese6
- Outcome
- accumulation of P in the plant aerial part dry mattere7
- Direction
- influencede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield of sweet potato”
e6“Phosphorus doses influenced the P level in the soil”
e7“the accumulation of P in the plant aerial part dry matter, tuberous roots and the total plant”
Claim · model-written summary
Phosphorus doses influenced total and commercial productivities.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- Phosphorus dosese6
- Outcome
- total and commercial productivitiese7
- Direction
- influencede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield of sweet potato”
e6“Phosphorus doses influenced the P level in the soil”
e7“root dry matter, total and commercial productivities”
The same questions in other 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
- no effect
- no effect
- no effect
19 papers more in this group
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.