Abstract
In this study, two experiments were conducted to evaluate the plant response of Brachiaria brizantha cv. MG5 to nitrogen forms and different pH of nutrient solution. For this, nutrient solutions containing ammonium and ammonium nitrate were fixed at pH 4, 6 or 8, and nutrient solution containing nitrate was fixed at pH 6. The pH adjustment was done by different compounds including MES, calcium hydroxide, calcium carbonate and sulfuric acid. In another experiment the seedlings were grown in nutrient solution with different N forms, but without pH adjustment. The results showed that plants in ammonium or ammonium nitrate at pH = 4 had better growth and performance, followed by pH = 6, compared to plants grown at pH = 8 (buffered with calcium carbonate). Calcium carbonate (bicarbonate) especially in higher amounts in nutrient solution (pH = 8) significantly reduced plant growth particularly root growth as the toxic effects were visible on the roots. The adverse effect of carbonate at high pH was more than those at low pH. High concentration of carbonate in presence of ammonium also was toxic for plants probably due to additional toxic effect of ammonia. However, plants were able to grow normally with different N forms under hydroponics culture, independent of pH effect. When pH was not controlled under different N-forms, there was no significant difference between root and shoot biomass production or leaf SPAD value and protein concentration. So, the presence of carbonate but not pH, was determined as an inhibiting factor for growth of Palisadegrass plants.
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Claims 9
Claim · model-written summary
Ammonium at pH 4 gave better growth than at pH 8.
- Taxon
- Brachiaria brizantha
Urochloa brizanthae1 - Treatment
- ammoniume0
- Outcome
- growth and performancee0
- Direction
- bettere0
- Qualifier
- pH = 4e0
- Comparator
- pH = 8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants in ammonium or ammonium nitrate at pH = 4 had better growth and performance, followed by pH = 6, compared to plants grown at pH = 8 (buffered with calcium carbonate)”
t0“Palisadegrass plants”
e1“Brachiaria brizantha cv. MG5”
Claim · model-written summary
Ammonium nitrate at pH 4 gave better growth than at pH 8.
- Taxon
- Brachiaria brizanthaUrochloa brizanthae1
- Treatment
- ammonium nitratee0
- Outcome
- growth and performancee0
- Direction
- bettere0
- Qualifier
- pH = 4e0
- Comparator
- pH = 8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants in ammonium or ammonium nitrate at pH = 4 had better growth and performance, followed by pH = 6, compared to plants grown at pH = 8 (buffered with calcium carbonate)”
t0“Palisadegrass plants”
e1“Brachiaria brizantha cv. MG5”
Claim · model-written summary
Calcium carbonate at pH 8 significantly reduced growth, especially root growth.
- Taxon
- Brachiaria brizanthaUrochloa brizanthae1
- Treatment
- Calcium carbonatee0
- Outcome
- plant growth particularly root growthe0
- Direction
- reducede0
- Qualifier
- pH = 8e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Calcium carbonate (bicarbonate) especially in higher amounts in nutrient solution (pH = 8) significantly reduced plant growth particularly root growth”
t0“Palisadegrass plants”
e1“Brachiaria brizantha cv. MG5”
Claim · model-written summary
Carbonate had a stronger adverse effect at high than low pH.
- Taxon
- Brachiaria brizanthaUrochloa brizanthae1
- Treatment
- carbonate at high pHe0
- Outcome
- adverse effect of carbonatee0
- Direction
- moree0
- Comparator
- low pHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“adverse effect of carbonate at high pH was more than those at low pH”
t0“Palisadegrass plants”
e1“Brachiaria brizantha cv. MG5”
Claim · model-written summary
High carbonate with ammonium was toxic, possibly because of ammonia.
- Taxon
- Brachiaria brizanthaUrochloa brizanthae1
- Treatment
- High concentration of carbonate in presence of ammoniume0
- Outcome
- toxic for plantse0
- Qualifier
- probably due to additional toxic effect of ammoniae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High concentration of carbonate in presence of ammonium also was toxic for plants probably due to additional toxic effect of ammonia”
t0“Palisadegrass plants”
e1“Brachiaria brizantha cv. MG5”
Claim · model-written summary
Plants grew normally under different nitrogen forms in hydroponics independent of pH.
- Taxon
- Brachiaria brizanthaUrochloa brizanthae1
- Treatment
- different N formse0
- Outcome
- grow normallye0
- Setting
- hydroponics culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants were able to grow normally with different N forms under hydroponics culture, independent of pH effect”
t0“Palisadegrass plants”
e1“Brachiaria brizantha cv. MG5”
Claim · model-written summary
Without pH control, nitrogen forms did not significantly change root and shoot biomass.
- Taxon
- Brachiaria brizanthaUrochloa brizanthae1
- Treatment
- different N-formse0
- Outcome
- root and shoot biomass productione0
- Direction
- no significant differencee0
- Qualifier
- pH was not controllede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When pH was not controlled under different N-forms, there was no significant difference between root and shoot biomass production or leaf SPAD value and protein concentration”
t0“Palisadegrass plants”
e1“Brachiaria brizantha cv. MG5”
Claim · model-written summary
Without pH control, nitrogen forms did not significantly change leaf SPAD or protein concentration.
- Taxon
- Brachiaria brizanthaUrochloa brizanthae1
- Treatment
- different N-formse0
- Outcome
- leaf SPAD value and protein concentratione0
- Direction
- no significant differencee0
- Qualifier
- pH was not controllede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When pH was not controlled under different N-forms, there was no significant difference between root and shoot biomass production or leaf SPAD value and protein concentration”
t0“Palisadegrass plants”
e1“Brachiaria brizantha cv. MG5”
Claim · model-written summary
The authors identified carbonate as the growth inhibitor.
- Taxon
- PalisadegrassUrochloa brizanthae0
- Compound
- carbonatee0
- Outcome
- growthe0
- Qualifier
- but not pHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the presence of carbonate but not pH, was determined as an inhibiting factor for growth of Palisadegrass plants”
The same questions in other papers
alkalinity · molecular: metabolites · Urochloa brizantha (palisade grass)Positive and negative results
1 in the opposite direction
- positive
nitrogen · growth · Urochloa brizantha (palisade grass)Positive and negative results
9 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- positive
7 papers more in this group
See all 11 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.