Abstract
This study selected two sweet potato varieties as research subjects and conducted a field experiment using a two-factor design with two potassium (K) levels (K0 and K1) and five nitrogen (N) levels (N0–N4). The physiological changes in sweet potato leaves under different N and K treatments were measured, and nutrients such as the soluble sugar, protein, and starch content of sweet potato roots were analyzed. The results indicate that the activity of glutamine synthetase (GS) and the soluble protein content in sweet potato leaves increase first and then decrease with increasing N application, while K application can significantly increase the activity of GS and the soluble protein content. The N metabolic capacity of leaves is strongest when the fertilizer ratio is K1N2. The SPAD value of sweet potato leaves increases with increasing N application. The net photosynthetic rate, stomatal conductance, and intercellular CO2 concentration first increase and then decrease with increasing N application. K fertilizer has a significant effect on these parameters. As the N application rate increases, the starch and protein content in the tubers increase, while the soluble sugar content decreases. However, the number of tubers per plant, fresh weight of the tubers, and dry weight of the tubers increase initially and then decrease, while the vine length continuously increases. The application of K fertilizer can significantly increase the number of tubers per plant and stem thickness of sweet potato. In conclusion, the appropriate N–K combined application can promote N metabolism, enhance the photosynthetic capacity of sweet potato, increase yield, and improve quality.
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Claims 12
Claim · model-written summary
Leaf glutamine synthetase activity and soluble protein content first increased and then decreased with increasing nitrogen application.
- Taxon
- sweet potato
_Flower.jpg?width=60)
Ipomoea batatase0 - Organ / stage
- leavese0
- Treatment
- increasing N applicatione0
- Gene
- glutamine synthetase (GS)e0
- Outcome
- activity of glutamine synthetase (GS) and the soluble protein contente0
- Direction
- increase first and then decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“the activity of glutamine synthetase (GS) and the soluble protein content in sweet potato leaves increase first and then decrease with increasing N application”
Claim · model-written summary
Potassium application significantly increased leaf glutamine synthetase activity and soluble protein content.
- Taxon
- sweet potatoIpomoea batatase0
- Organ / stage
- leavese0
- Treatment
- K applicatione0
- Outcome
- activity of GS and the soluble protein contente0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sweet potato leaves increase first and then decrease with increasing N application, while K application can significantly increase the activity of GS and the soluble protein content.”
Claim · model-written summary
Leaf nitrogen metabolic capacity was greatest at the K1N2 fertilizer ratio.
- Taxon
- Sweet PotatoIpomoea batatast0
- Organ / stage
- leavese0
- Treatment
- K1N2e0
- Outcome
- N metabolic capacitye0
- Direction
- strongeste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N metabolic capacity of leaves is strongest when the fertilizer ratio is K1N2.”
t0“Sweet Potato”
Claim · model-written summary
Leaf SPAD increased with increasing nitrogen application.
- Taxon
- sweet potatoIpomoea batatase0
- Organ / stage
- leavese0
- Treatment
- increasing N applicatione0
- Outcome
- SPAD valuee0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The SPAD value of sweet potato leaves increases with increasing N application.”
Claim · model-written summary
Net photosynthetic rate, stomatal conductance and intercellular CO2 first increased and then decreased as nitrogen application rose.
- Taxon
- Sweet PotatoIpomoea batatast0
- Treatment
- increasing N applicatione0
- Outcome
- net photosynthetic rate, stomatal conductance, and intercellular CO2 concentratione0
- Direction
- first increase and then decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The net photosynthetic rate, stomatal conductance, and intercellular CO2 concentration first increase and then decrease with increasing N application.”
t0“Sweet Potato”
Claim · model-written summary
Potassium fertilizer significantly affected net photosynthetic rate, stomatal conductance and intercellular CO2 concentration.
- Taxon
- Sweet PotatoIpomoea batatast0
- Treatment
- K fertilizere0
- Outcome
- net photosynthetic rate, stomatal conductance, and intercellular CO2 concentratione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The net photosynthetic rate, stomatal conductance, and intercellular CO2 concentration first increase and then decrease with increasing N application. K fertilizer has a significant effect on these parameters.”
t0“Sweet Potato”
Claim · model-written summary
Tuber starch and protein content increased as nitrogen application increased.
- Taxon
- Sweet PotatoIpomoea batatast0
- Organ / stage
- tuberse0
- Treatment
- N application ratee0
- Outcome
- starch and protein contente0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As the N application rate increases, the starch and protein content in the tubers increase”
t0“Sweet Potato”
Claim · model-written summary
Tuber soluble sugar content decreased as nitrogen application increased.
- Taxon
- Sweet PotatoIpomoea batatast0
- Organ / stage
- tuberse0
- Treatment
- N application ratee0
- Outcome
- soluble sugar contente0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As the N application rate increases, the starch and protein content in the tubers increase, while the soluble sugar content decreases.”
t0“Sweet Potato”
Claim · model-written summary
Tuber number, fresh weight and dry weight initially increased and then decreased as nitrogen application rose.
- Taxon
- Sweet PotatoIpomoea batatast0
- Outcome
- number of tubers per plant, fresh weight of the tubers, and dry weight of the tuberse0
- Direction
- increase initially and then decreasee0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the number of tubers per plant, fresh weight of the tubers, and dry weight of the tubers increase initially and then decrease”
t0“Sweet Potato”
Claim · model-written summary
Sweet potato vine length increased continuously with increasing nitrogen application.
- Taxon
- Sweet PotatoIpomoea batatast0
- Treatment
- N application ratee0
- Outcome
- vine lengthe0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As the N application rate increases, the starch and protein content in the tubers increase, while the soluble sugar content decreases. However, the number of tubers per plant, fresh weight of the tubers, and dry weight of the tubers increase initially and then decrease, while the vine length continuously increases.”
t0“Sweet Potato”
Claim · model-written summary
Potassium fertilizer significantly increased tuber number and stem thickness.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- K fertilizere0
- Outcome
- number of tubers per plant and stem thicknesse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of K fertilizer can significantly increase the number of tubers per plant and stem thickness of sweet potato.”
Claim · model-written summary
The authors conclude that an appropriate combined nitrogen–potassium application promotes nitrogen metabolism, photosynthesis, yield and quality.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- appropriate N–K combined applicatione0
- Outcome
- N metabolism, enhance the photosynthetic capacity of sweet potato, increase yield, and improve qualitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the appropriate N–K combined application can promote N metabolism, enhance the photosynthetic capacity of sweet potato, increase yield, and improve quality.”
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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.