Abstract
ABSTRACT Phosphorus (P) is an essential nutrient for growth and yield of sweet potatoes; in sandy soils, sweet potato yield and quality may be limited by application of low P doses, mainly in degraded areas. The objective of this work was to evaluate the effect of P doses on yield and quality of sweet potato root tubers grown in tropical sandy soils with different initial P availabilities: 23.2 mg dm-3 (high P - crop rotation) and 3.7 mg dm-3 (low P - post degraded pasture). Two experiments were carried out in a randomized block design, with four replicates. The treatments consisted of P doses (0, 22, 44, 88, and 176 kg ha-1) applied to the planting bed. Tuber yield, number and mean weight of tubers, P concentration in leaves and tubers, exported P, as well as the percentage of starch, reducing sugars, total sugars, and sucrose in the tubers were evaluated. P concentration in the soil was evaluated at the end of the experiment. In the area with high P availability (> 20 mg dm-3 - resin), increasing P doses did not increase root tuber yield and decreased root starch concentrations. In the area with low P availability (< 3.7 mg dm-3 - resin), root tuber yield and starch concentration peaked when applying 68 and 33 kg ha-1 of P, respectively. In areas after degraded pasture, with low initial soil P concentration, P fertilization for sweet potato crops should be carried out with a P dose of 68 kg ha-1. In areas with crop rotation and adequate soil P concentration, P fertilization should be carried out to replace the amount of P exported by the harvested root tubers to avoid decreases in soil fertility.
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Claims 6
Claim · model-written summary
In high P soil, increasing P did not increase tuber yield.
- Taxon
- sweet potato
_Flower.jpg?width=60)
Ipomoea batatast0 - Treatment
- increasing P dosese0
- Outcome
- root tuber yielde0
- Direction
- did not increasee0
- Setting
- area with high P availabilitye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“In the area with high P availability (> 20 mg dm-3 - resin), increasing P doses did not increase root tuber yield”
t0“Sweet potato”
Claim · model-written summary
In high P soil, increasing P decreased root starch.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- increasing P dosese0
- Outcome
- root starch concentrationse0
- Direction
- decreasede0
- Setting
- area with high P availabilitye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the area with high P availability (> 20 mg dm-3 - resin), increasing P doses did not increase root tuber yield and decreased root starch concentrations”
t0“Sweet potato”
Claim · model-written summary
In low P soil, tuber yield peaked at 68 kg ha-1 P.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- applying 68 and 33 kg ha-1 of Pe0
- Outcome
- root tuber yielde0
- Direction
- peakede0
- Value
- 68 kg ha-1e1
- Setting
- area with low P availabilitye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the area with low P availability (< 3.7 mg dm-3 - resin), root tuber yield and starch concentration peaked when applying 68 and 33 kg ha-1 of P, respectively”
t0“Sweet potato”
e1“P fertilization for sweet potato crops should be carried out with a P dose of 68 kg ha-1”
Claim · model-written summary
In low P soil, starch concentration peaked at 33 kg ha-1 P.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- applying 68 and 33 kg ha-1 of Pe0
- Outcome
- starch concentratione0
- Direction
- peakede0
- Value
- 33 kg ha-1e0
- Setting
- area with low P availabilitye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the area with low P availability (< 3.7 mg dm-3 - resin), root tuber yield and starch concentration peaked when applying 68 and 33 kg ha-1 of P, respectively”
t0“Sweet potato”
Claim · model-written summary
After degraded pasture, the authors recommend 68 kg ha-1 P for sweet potato.
- Taxon
- sweet potatoIpomoea batatase0
- Outcome
- P fertilizatione0
- Value
- 68 kg ha-1e0
- Setting
- areas after degraded pasturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In areas after degraded pasture, with low initial soil P concentration, P fertilization for sweet potato crops should be carried out with a P dose of 68 kg ha-1”
Claim · model-written summary
In rotated soils with adequate P, fertilization should replace harvested tuber P exports.
- Taxon
- sweet potatoIpomoea batatast0
- Outcome
- P fertilization should be carried out to replace the amount of P exportede0
- Setting
- areas with crop rotatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In areas with crop rotation and adequate soil P concentration, P fertilization should be carried out to replace the amount of P exported by the harvested root tubers to avoid decreases in soil fertility”
t0“Sweet potato”
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