Abstract
Abstract Can humic acid (HA) and glutamic acid (GA), when added to tomato (Lycopersicon esculentum Mill. cv. ‘Hongyangli’) nutrient solution in a hydroponic system, improve growth? Tomato seedlings were grown in six nutrient solutions: (1) control (C), (2) C + 25 mg L−1 HA (HA1); (3) C + 50 mg L−1 HA (HA2); (4) C + 100 mg L−1 GA; (5) HA1 + GA; (6) HA2 + GA. Various biochemical and physiological parameters were measured. HA increased photosynthesis rate and mesophyll conductance. HA did not significantly affect transpiration, stomatal conductance, titratable acidity, or antioxidant activity. In addition, GA improved protein and sugar content, mesophyll conductance and yield. The combination of HA and GA was more effective, especially with 50 mg L−1 HA. The activity of superoxide dismutase (SOD) and peroxidases (POD) did not change in the presence of HA or GA. Malondialdehyde (MDA) content increased by 30% in HA2 together with GA. HA has a positive effect on tomato hydroponic growth when applied with GA. This expands the use of HA and GA for horticultural commodities in hydroponic systems.
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Claims 9
Claim · model-written summary
HA increased photosynthesis rate and mesophyll conductance.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- HAe0
- Outcome
- photosynthesis rate and mesophyll conductancee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HA increased photosynthesis rate and mesophyll conductance.”
t0“tomato”
Claim · model-written summary
HA did not significantly affect transpiration, stomatal conductance, and titratable acidity.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- HAe0
- Outcome
- transpiration, stomatal conductance, titratable aciditye0
- Direction
- did not significantly affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HA did not significantly affect transpiration, stomatal conductance, titratable acidity, or antioxidant activity.”
t0“tomato”
Claim · model-written summary
HA did not significantly affect antioxidant activity.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- HAe0
- Outcome
- antioxidant activitye0
- Direction
- did not significantly affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HA did not significantly affect transpiration, stomatal conductance, titratable acidity, or antioxidant activity.”
t0“tomato”
Claim · model-written summary
GA improved protein and sugar content and mesophyll conductance.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- GAe0
- Outcome
- protein and sugar content, mesophyll conductancee0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In addition, GA improved protein and sugar content, mesophyll conductance and yield.”
t0“tomato”
Claim · model-written summary
GA improved tomato yield.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- GAe0
- Outcome
- yielde0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In addition, GA improved protein and sugar content, mesophyll conductance and yield.”
t0“tomato”
Claim · model-written summary
Combined HA and GA was more effective, especially with 50 mg L−1 HA.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- combination of HA and GAe0
- Outcome
- more effectivee0
- Direction
- more effectivee0
- Qualifier
- 50 mg L−1 HAe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combination of HA and GA was more effective, especially with 50 mg L−1 HA.”
t0“tomato”
Claim · model-written summary
SOD and POD activity did not change with HA or GA.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- HA or GAe0
- Gene
- superoxide dismutase (SOD) and peroxidases (POD)e0
- Outcome
- activity of superoxide dismutase (SOD) and peroxidases (POD)e0
- Direction
- did not changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activity of superoxide dismutase (SOD) and peroxidases (POD) did not change in the presence of HA or GA.”
t0“tomato”
Claim · model-written summary
MDA content increased 30% under HA2 plus GA.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- HA2 together with GAe0
- Outcome
- Malondialdehyde (MDA) contente0
- Direction
- increasede0
- Value
- 30%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Malondialdehyde (MDA) content increased by 30% in HA2 together with GA.”
t0“tomato”
Claim · model-written summary
HA with GA positively affected hydroponic tomato growth.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- HAe0
- Outcome
- tomato hydroponic growthe0
- Direction
- positive effecte0
- Qualifier
- when applied with GAe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HA has a positive effect on tomato hydroponic growth when applied with GA.”
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See all 175 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.