Abstract
Humic acid (HA), not only promote the growth of crop roots, they can be combined with nitrogen (N) to increase fertilizer use efficiency and yield. However, the effects of HA urea fertilizer (HA-N) on root growth and yield of sweet potato has not been widely investigated. Xushu 28 was used as the experimental crop to investigate the effects of HA-N on root morphology, active oxygen metabolism and yield under field conditions. Results showed that nitrogen application alone was not beneficial for root growth and storage root formation during the early growth stage. HA-N significantly increased the dry weight of the root system, promoted differentiation from adventitious root to storage root, and increased the overall root activity, total root length, root diameter, root surface area, as well as root volume. HA-N thus increased the activity of superoxide dismutase (SOD), peroxidase (POD), and Catalase (CAT) as well as increasing the soluble protein content of roots and decreasing the malondialdehyde (MDA) content. HA-N significantly increased both the number of storage roots per plant increased by 14.01%, and the average fresh weight per storage root increased by 13.7%, while the yield was also obviously increased by 29.56%. In this study, HA-N increased yield through a synergistic increase of biological yield and harvest index.
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Claims 12
Claim · model-written summary
Nitrogen application alone was not beneficial for root growth and storage root formation of sweet potato during the early growth stage.
- Taxon
- sweet potato
_Flower.jpg?width=60)
Ipomoea batatase1 - Material
- Xushu 28e0
- Organ / stage
- early growth stagee2
- Treatment
- nitrogen application alonee2
- Outcome
- root growth and storage root formatione2
- Direction
- not beneficiale2
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“Xushu 28 was used as the experimental crop to investigate the effects of HA-N on root morphology, active oxygen metabolism and yield under field conditions”
e1“the effects of HA urea fertilizer (HA-N) on root growth and yield of sweet potato”
e2“nitrogen application alone was not beneficial for root growth and storage root formation during the early growth stage”
Claim · model-written summary
HA-N significantly increased the dry weight of the sweet potato root system.
- Taxon
- sweet potatoIpomoea batatase1
- Material
- Xushu 28e0
- Organ / stage
- root systeme3
- Treatment
- HA-Ne0
- Outcome
- dry weight of the root systeme3
- Direction
- increasede3
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Xushu 28 was used as the experimental crop to investigate the effects of HA-N on root morphology, active oxygen metabolism and yield under field conditions”
e1“the effects of HA urea fertilizer (HA-N) on root growth and yield of sweet potato”
e3“HA-N significantly increased the dry weight of the root system”
Claim · model-written summary
HA-N promoted differentiation from adventitious root to storage root in sweet potato.
- Taxon
- sweet potatoIpomoea batatase1
- Material
- Xushu 28e0
- Organ / stage
- storage roote4
- Treatment
- HA-Ne0
- Outcome
- differentiation from adventitious root to storage roote4
- Direction
- promotede4
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Xushu 28 was used as the experimental crop to investigate the effects of HA-N on root morphology, active oxygen metabolism and yield under field conditions”
e1“the effects of HA urea fertilizer (HA-N) on root growth and yield of sweet potato”
e4“promoted differentiation from adventitious root to storage root”
Claim · model-written summary
HA-N increased the overall root activity, total root length and root diameter of sweet potato.
- Taxon
- sweet potatoIpomoea batatase1
- Material
- Xushu 28e0
- Treatment
- HA-Ne0
- Outcome
- overall root activity, total root length, root diametere5
- Direction
- increasede5
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Xushu 28 was used as the experimental crop to investigate the effects of HA-N on root morphology, active oxygen metabolism and yield under field conditions”
e1“the effects of HA urea fertilizer (HA-N) on root growth and yield of sweet potato”
e5“increased the overall root activity, total root length, root diameter, root surface area, as well as root volume”
Claim · model-written summary
HA-N increased the root surface area and root volume of sweet potato.
- Taxon
- sweet potatoIpomoea batatase1
- Material
- Xushu 28e0
- Treatment
- HA-Ne0
- Outcome
- root surface area, as well as root volumee5
- Direction
- increasede5
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Xushu 28 was used as the experimental crop to investigate the effects of HA-N on root morphology, active oxygen metabolism and yield under field conditions”
e1“the effects of HA urea fertilizer (HA-N) on root growth and yield of sweet potato”
e5“increased the overall root activity, total root length, root diameter, root surface area, as well as root volume”
Claim · model-written summary
HA-N increased the activity of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) in sweet potato roots.
- Taxon
- sweet potatoIpomoea batatase1
- Material
- Xushu 28e0
- Treatment
- HA-Ne0
- Outcome
- activity of superoxide dismutase (SOD), peroxidase (POD), and Catalase (CAT)e6
- Direction
- increasede6
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Xushu 28 was used as the experimental crop to investigate the effects of HA-N on root morphology, active oxygen metabolism and yield under field conditions”
e1“the effects of HA urea fertilizer (HA-N) on root growth and yield of sweet potato”
e6“HA-N thus increased the activity of superoxide dismutase (SOD), peroxidase (POD), and Catalase (CAT)”
Claim · model-written summary
HA-N increased the soluble protein content of sweet potato roots.
- Taxon
- sweet potatoIpomoea batatase1
- Material
- Xushu 28e0
- Treatment
- HA-Ne0
- Outcome
- soluble protein content of rootse7
- Direction
- increasinge7
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Xushu 28 was used as the experimental crop to investigate the effects of HA-N on root morphology, active oxygen metabolism and yield under field conditions”
e1“the effects of HA urea fertilizer (HA-N) on root growth and yield of sweet potato”
e7“as well as increasing the soluble protein content of roots”
Claim · model-written summary
HA-N decreased the malondialdehyde (MDA) content of sweet potato roots.
- Taxon
- sweet potatoIpomoea batatase1
- Material
- Xushu 28e0
- Treatment
- HA-Ne0
- Outcome
- malondialdehyde (MDA) contente2
- Direction
- decreasinge2
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Xushu 28 was used as the experimental crop to investigate the effects of HA-N on root morphology, active oxygen metabolism and yield under field conditions”
e1“the effects of HA urea fertilizer (HA-N) on root growth and yield of sweet potato”
e2“decreasing the malondialdehyde (MDA) content”
Claim · model-written summary
HA-N increased the number of storage roots per sweet potato plant by 14.01%.
- Taxon
- sweet potatoIpomoea batatase1
- Material
- Xushu 28e0
- Treatment
- HA-Ne0
- Outcome
- number of storage roots per plante2
- Direction
- increasede2
- Value
- 14.01%e2
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Xushu 28 was used as the experimental crop to investigate the effects of HA-N on root morphology, active oxygen metabolism and yield under field conditions”
e1“the effects of HA urea fertilizer (HA-N) on root growth and yield of sweet potato”
e2“HA-N significantly increased both the number of storage roots per plant increased by 14.01%”
Claim · model-written summary
HA-N increased the average fresh weight per storage root of sweet potato by 13.7%.
- Taxon
- sweet potatoIpomoea batatase1
- Material
- Xushu 28e0
- Treatment
- HA-Ne0
- Outcome
- average fresh weight per storage roote2
- Direction
- increasede2
- Value
- 13.7%e2
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Xushu 28 was used as the experimental crop to investigate the effects of HA-N on root morphology, active oxygen metabolism and yield under field conditions”
e1“the effects of HA urea fertilizer (HA-N) on root growth and yield of sweet potato”
e2“the average fresh weight per storage root increased by 13.7%”
Claim · model-written summary
HA-N increased the yield of sweet potato by 29.56%.
- Taxon
- sweet potatoIpomoea batatase1
- Material
- Xushu 28e0
- Treatment
- HA-Ne0
- Outcome
- yielde2
- Direction
- increasede2
- Value
- 29.56%e2
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Xushu 28 was used as the experimental crop to investigate the effects of HA-N on root morphology, active oxygen metabolism and yield under field conditions”
e1“the effects of HA urea fertilizer (HA-N) on root growth and yield of sweet potato”
e2“the yield was also obviously increased by 29.56%”
Claim · model-written summary
HA-N increased sweet potato yield through a synergistic increase of biological yield and harvest index.
- Taxon
- sweet potatoIpomoea batatase1
- Material
- Xushu 28e0
- Treatment
- HA-Ne0
- Outcome
- biological yield and harvest indexe2
- Direction
- synergistic increasee2
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Xushu 28 was used as the experimental crop to investigate the effects of HA-N on root morphology, active oxygen metabolism and yield under field conditions”
e1“the effects of HA urea fertilizer (HA-N) on root growth and yield of sweet potato”
e2“HA-N increased yield through a synergistic increase of biological yield and harvest index”
The same questions in other papers
nitrogen · growth · Ipomoea batatas (sweet potato)Positive and negative results
8 papers in the same direction as this paper · 19 in the opposite direction
- positive
- positive
- no effect
24 papers more in this group
See all 28 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.