Abstract
Nitrogen is an essential element for plant growth, and both insufficient and excessive use of nitrogen have been shown to negatively affect sweet potato production. Nitrogen supply can affect carbon metabolism in plant storage organs; however, limited studies have examined its effects on the accumulation of non-structural carbohydrates (soluble sugar and starch) during the formation of sweet potato storage roots. Two pot trials were conducted to evaluate the effects of different nitrogen application levels and timings on the accumulation of non-structural carbohydrates during the formation of sweet potato storage roots. In the first experiment, plants were supplied with 0, 50, 100, or 200 mg/L of nitrogen. In the second experiment, the optimum nitrogen rate (100 mg/L) for storage root formation from the previous experiment was applied at five different times: nil N supply and nitrogen applied at planting or 3, 7, or 14 days after planting. A significant highest starch accumulation in roots during the first 35 days after transplanting was recorded in the 100 mg/L treatment. However, sweet potato required more nitrogen after storage root formation, as indicated by higher non-structural carbohydrate accumulation in roots (1905 mg/plant) in the 200 mg/L treatment at 49 days after planting. Earlier nitrogen applications promoted soluble sugar and starch accumulation in plants during storage root formation, with up to 5697 mg of non-structural carbohydrate accumulated in a plant. The study provided agronomic indicators that moderate nitrogen should be available in soil before or on planting day.
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Claims 4
Claim · model-written summary
The 100 mg/L nitrogen treatment produced the highest starch accumulation in roots during the first 35 days after transplanting.
- Taxon
- sweet potato
_Flower.jpg?width=60)
Ipomoea batatast0 - Treatment
- 100 mg/L treatmente1
- Outcome
- starch accumulation in rootse1
- Direction
- higheste1
- Setting
- first 35 days after transplantinge1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e1“A significant highest starch accumulation in roots during the first 35 days after transplanting was recorded in the 100 mg/L treatment.”
t0“Effects of Nitrogen Application on Soluble Sugar and Starch Accumulation During Sweet Potato Storage Root Formation”
Claim · model-written summary
At 49 days after planting, 200 mg/L nitrogen yielded 1905 mg/plant non-structural carbohydrate accumulation in roots.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- 200 mg/L treatmente1
- Outcome
- non-structural carbohydrate accumulation in rootse1
- Direction
- highere1
- Value
- 1905 mg/plante1
- Setting
- 49 days after plantinge1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“higher non-structural carbohydrate accumulation in roots (1905 mg/plant) in the 200 mg/L treatment at 49 days after planting”
t0“Effects of Nitrogen Application on Soluble Sugar and Starch Accumulation During Sweet Potato Storage Root Formation”
Claim · model-written summary
Earlier nitrogen applications promoted soluble sugar and starch accumulation during storage-root formation, reaching 5697 mg per plant.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- Earlier nitrogen applicationse1
- Outcome
- soluble sugar and starch accumulatione1
- Direction
- promotede1
- Value
- 5697 mge1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Earlier nitrogen applications promoted soluble sugar and starch accumulation in plants during storage root formation, with up to 5697 mg of non-structural carbohydrate accumulated in a plant.”
t0“Effects of Nitrogen Application on Soluble Sugar and Starch Accumulation During Sweet Potato Storage Root Formation”
Claim · model-written summary
Moderate nitrogen should be available in soil before or on planting day.
- Taxon
- sweet potatoIpomoea batatast0
- Outcome
- moderate nitrogen should be available in soil before or on planting daye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“moderate nitrogen should be available in soil before or on planting day.”
t0“Effects of Nitrogen Application on Soluble Sugar and Starch Accumulation During Sweet Potato Storage Root Formation”
The same questions in other papers
nitrogen · physiology: osmolytes · Ipomoea batatas (sweet potato)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
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.