Abstract
Greenhouse experiments with tomato were conducted in the years 2004-2006. The aim was to study the effect of nutrient solution pH on the availability of phosphorus in soilless culture of tomato. Tomato plants were grown on mats made of shredded rye straw, and on slabs of peat and rockwool. The plants were fertilized with a standard nutrient solution of different pH: 4.5, 5.0, 5.5, 6.0 and 6.5. Such different pH levels of the nutrient solution used in soilless culture modified the pH of the root growth zone. This effect was more evident in rockwool than in the organic media (especially straw). The phosphorus content in the root zone was closely associated with the pH value of the supplied nutrient solution and the kind of growing medium. Considerably lower concentrations of phosphorus were recorded in the organic media (straw, peat) than in rockwool. As the pH level of the nutrient solution increased, so did the pH of the root zone, whereas the amount of available P-PO 4 decreased. The course of these changes was similar in all the substrates. However, the dynamics of the changes was weaker in the organic media. With an increase in the pH of the nutrient solution, the average phosphorus content in tomato leaves decreased. The P-PO4 concentration was higher in the leaves of tomato plants growing in rockwool compared to those in the organic media. A significantly higher marketable yield was obtained from tomato plants cultivated in rockwool than in the organic media. For all the growing media, the highest yield of tomatoes was obtained after feeding the plants with the nutrient solution of pH 5.5.
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Claims 7
Claim · model-written summary
Available P-PO4 in the root zone decreased as the pH of the nutrient solution increased.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- pH level of the nutrient solutione1
- Outcome
- amount of available P-PO 4e1
- Direction
- decreasede1
- Setting
- Greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Greenhouse experiments with tomato were conducted in the years 2004-2006”
e1“As the pH level of the nutrient solution increased, so did the pH of the root zone, whereas the amount of available P-PO 4 decreased”
Claim · model-written summary
Phosphorus content in tomato leaves decreased with an increase in the pH of the nutrient solution.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- leavese2
- Treatment
- increase in the pH of the nutrient solutione2
- Outcome
- phosphorus content in tomato leavese2
- Direction
- decreasede2
- Setting
- Greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Greenhouse experiments with tomato were conducted in the years 2004-2006”
e2“With an increase in the pH of the nutrient solution, the average phosphorus content in tomato leaves decreased”
Claim · model-written summary
Phosphorus content in the root zone was closely associated with the pH of the supplied nutrient solution and the kind of growing medium.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- pH value of the supplied nutrient solutione3
- Outcome
- phosphorus content in the root zonee3
- Setting
- Greenhousee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Greenhouse experiments with tomato were conducted in the years 2004-2006”
e3“The phosphorus content in the root zone was closely associated with the pH value of the supplied nutrient solution and the kind of growing medium”
Claim · model-written summary
P-PO4 concentration in tomato leaves was higher for plants grown in rockwool than in organic media.
- Taxon
- tomatoSolanum lycopersicume4
- Organ / stage
- leavese4
- Treatment
- growing in rockwoole4
- Outcome
- P-PO4 concentratione4
- Direction
- highere4
- Comparator
- organic mediae4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Greenhouse experiments with tomato were conducted in the years 2004-2006”
e4“The P-PO4 concentration was higher in the leaves of tomato plants growing in rockwool compared to those in the organic media”
Claim · model-written summary
Marketable yield of tomato was significantly higher when cultivated in rockwool than in organic media.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- cultivated in rockwoole5
- Outcome
- marketable yielde5
- Direction
- highere5
- Comparator
- organic mediae5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Greenhouse experiments with tomato were conducted in the years 2004-2006”
e5“A significantly higher marketable yield was obtained from tomato plants cultivated in rockwool than in the organic media”
Claim · model-written summary
The highest tomato yield was obtained with a nutrient solution of pH 5.5 for all growing media.
- Taxon
- tomatoesSolanum lycopersicume6
- Treatment
- nutrient solution of pH 5.5e6
- Outcome
- yield of tomatoese6
- Direction
- higheste6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“For all the growing media, the highest yield of tomatoes was obtained after feeding the plants with the nutrient solution of pH 5.5”
Claim · model-written summary
The pH of the root growth zone increased as the pH of the nutrient solution increased, more strongly in rockwool than in organic media.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- pH levels of the nutrient solutione1
- Outcome
- pH of the root growth zonee1
- Direction
- increaseinferrede1
- Qualifier
- more evident in rockwool than in the organic mediae2
- Setting
- Greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Greenhouse experiments with tomato were conducted in the years 2004-2006”
e1“Such different pH levels of the nutrient solution used in soilless culture modified the pH of the root growth zone”
e2“This effect was more evident in rockwool than in the organic media”
The same questions in other papers
growing medium · quality: postharvest · Solanum lycopersicum (tomato)Positive and negative results
17 papers in the same direction as this paper · 4 in the opposite direction · 3 reporting no difference from an alternative
- positive
- no effect
- negative
21 papers more in this group
See all 25 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.