Abstract
Pot experiments were conducted on the effects of application of nitrogenous fertilizer and soil type on the top growth and tuber-formation and -thickening in sweetpotato. Four types of soil differing in their clay content were used.Application of whole amount of nitrogenous fertilizer at one time after cuttings were planted was unfavourable to tuber formation owing to the vigorous vine growth during the tuber formation. It was true to the thickening of tubers, too, because top growth was gradually weakened after tubers began to thicken.On the other hand, fractional application of nitrogenous fertilizer was favourable to both tuberformation and -thickening due to the limited growth of vines during tuber formation and also moderately maintained top growth during tuber thickening. Total weight of tubers was heavier in the fractionary application plot than in the basic application plot, though yield of large tubers was less in the former than in the latter.When nitrogen was almost doubled in its amount and was applied fractionally, yield of tubers was increased regardless of the amount of potassium on the sandy soil, while on the caly soil it wa sdecreased unless the amount of potassium was increased.
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Claims 7
Claim · model-written summary
Single application of all nitrogen fertilizer was unfavorable to sweetpotato tuber formation.
- Taxon
- sweetpotato
_Flower.jpg?width=60)
Ipomoea batatast0 - Treatment
- Application of whole amount of nitrogenous fertilizer at one timee0
- Outcome
- tuber formatione0
- Direction
- unfavourablee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“Application of whole amount of nitrogenous fertilizer at one time after cuttings were planted was unfavourable to tuber formation”
t0“sweetpotato”
Claim · model-written summary
Single nitrogen application was unfavorable to tuber thickening.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- Application of whole amount of nitrogenous fertilizer at one timee0
- Outcome
- thickening of tuberse0
- Direction
- unfavourablee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of whole amount of nitrogenous fertilizer at one time after cuttings were planted was unfavourable to tuber formation owing to the vigorous vine growth during the tuber formation. It was true to the thickening of tubers, too”
t0“sweetpotato”
Claim · model-written summary
Fractional nitrogen application favored tuber formation and thickening.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- fractional application of nitrogenous fertilizere0
- Outcome
- tuberformation and -thickeninge0
- Direction
- favourablee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fractional application of nitrogenous fertilizer was favourable to both tuberformation and -thickening”
t0“sweetpotato”
Claim · model-written summary
Fractional nitrogen application gave greater total tuber weight than basic application.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- fractionary application plote0
- Outcome
- Total weight of tuberse0
- Direction
- heaviere0
- Comparator
- basic application plote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total weight of tubers was heavier in the fractionary application plot than in the basic application plot”
t0“sweetpotato”
Claim · model-written summary
Fractional nitrogen application gave less yield of large tubers than basic application.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- fractionary application plote0
- Outcome
- yield of large tuberse0
- Direction
- lesse0
- Comparator
- basic application plote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total weight of tubers was heavier in the fractionary application plot than in the basic application plot, though yield of large tubers was less in the former than in the latter”
t0“sweetpotato”
Claim · model-written summary
Nearly doubled fractional nitrogen increased tuber yield on sandy soil regardless of potassium amount.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- nitrogen was almost doubled in its amount and was applied fractionallye0
- Outcome
- yield of tuberse0
- Direction
- increasede0
- Setting
- sandy soile0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When nitrogen was almost doubled in its amount and was applied fractionally, yield of tubers was increased regardless of the amount of potassium on the sandy soil”
t0“sweetpotato”
Claim · model-written summary
Nearly doubled fractional nitrogen decreased tuber yield on clay soil unless potassium was increased.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- nitrogen was almost doubled in its amount and was applied fractionallye0
- Outcome
- yield of tuberse0
- Direction
- sdecreasede0
- Setting
- caly soile0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When nitrogen was almost doubled in its amount and was applied fractionally, yield of tubers was increased regardless of the amount of potassium on the sandy soil, while on the caly soil it wa sdecreased unless the amount of potassium was increased”
t0“sweetpotato”
The same questions in other papers
nitrogen · yield · Ipomoea batatas (sweet potato)Results differ
30 papers in the same direction as this paper · 4 in the opposite direction
- negative
- no effect
- no effect
31 papers more in this group
See all 35 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.