Abstract
The purpose of this study was to establish an efficient reusing methods of perlite medium in the recycling hydroponic system. This experiment was carried out over three continuous cultivations of tomatoes from 1997 to 1998. Before cultivation, the reused medium was treated with : washing with water (WW), steam sterilization (SS), steam sterilization after washing (SSW), new perlite (NP), and non-treated reusing perlite (NRP). The results of cultivation showed that, in SSW treatment, the chlorophyll contents and the growth of ‘Momotaro T93’ tomato were greater than in other treatments. Marketable yield in SSW was increased by 19% as compared with that of NRP. Concentrations of inorganic elements in perlite medium were decreased by WW and SSW treatments, but concentrations of phosphate and calcium were unchanged. Concentration of total phenolics in the nutrient solution after cultivation in SSW was lower as compared with that in NRP. The phenolics were identified to be p-hydroxybenzonic acid, p-coumaric acid and ferulic acid by HPLC analysis. Futhermore, nutrients containing high concentration of phenolics inhibited germination of tomato seeds in petridishes. Therefore, the concentration of total phenolics may have affected on marketable yield of tomato in the recycled hydroponic system.
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Claims 9
Claim · model-written summary
Steam sterilization after washing increased Momotaro T93 tomato chlorophyll content and growth relative to other treatments.
- Taxon
- tomato
Solanum lycopersicume0 - Material
- Momotaro T93e0
- Treatment
- SSW treatmente0
- Outcome
- chlorophyll contents and the growthe0
- Direction
- greatere0
- Comparator
- other treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in SSW treatment, the chlorophyll contents and the growth of ‘Momotaro T93’ tomato were greater than in other treatments”
Claim · model-written summary
Steam sterilization after washing increased marketable tomato yield 19% relative to untreated reused perlite.
Not reportedTaxon
Verbatim
e0“Marketable yield in SSW was increased by 19% as compared with that of NRP”
Claim · model-written summary
Washing with water lowered inorganic element concentrations in perlite.
Not reportedTaxonComparator
Verbatim
e0“Concentrations of inorganic elements in perlite medium were decreased by WW and SSW treatments”
Claim · model-written summary
Steam sterilization after washing lowered inorganic element concentrations in perlite.
Not reportedTaxonComparator
Verbatim
e0“Concentrations of inorganic elements in perlite medium were decreased by WW and SSW treatments”
Claim · model-written summary
Phosphate and calcium concentrations in perlite remained unchanged under washing and steam sterilization after washing.
- Treatment
- WW and SSW treatmentse0
- Outcome
- concentrations of phosphate and calciume0
- Direction
- unchangede0
Not reportedTaxon
Verbatim
e0“Concentrations of inorganic elements in perlite medium were decreased by WW and SSW treatments, but concentrations of phosphate and calcium were unchanged”
Claim · model-written summary
Total phenolics in the nutrient solution were lower after steam sterilization following washing than after untreated reuse.
- Treatment
- SSWe0
- Outcome
- Concentration of total phenolics in the nutrient solutione0
- Direction
- lowere0
- Comparator
- NRPe0
Not reportedTaxon
Verbatim
e0“Concentration of total phenolics in the nutrient solution after cultivation in SSW was lower as compared with that in NRP”
Claim · model-written summary
p-hydroxybenzonic acid, p-coumaric acid and ferulic acid were identified among phenolics.
- Outcome
- p-hydroxybenzonic acid, p-coumaric acid and ferulic acide0
Not reportedTaxon
Verbatim
e0“The phenolics were identified to be p-hydroxybenzonic acid, p-coumaric acid and ferulic acid by HPLC analysis”
Claim · model-written summary
High-phenolic nutrient solution inhibited tomato seed germination in petri dishes.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- seedse0
- Treatment
- nutrients containing high concentration of phenolicse0
- Outcome
- germinatione0
- Direction
- inhibitede0
- Setting
- petridishese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nutrients containing high concentration of phenolics inhibited germination of tomato seeds in petridishes”
Claim · model-written summary
The authors suggest total phenolic concentration may have affected marketable tomato yield in recycled hydroponics.
- Taxon
- tomatoSolanum lycopersicume0
- Compound
- total phenolicse0
- Outcome
- marketable yielde0
- Qualifier
- may have affectede0
- Setting
- recycled hydroponic systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentration of total phenolics may have affected on marketable yield of tomato in the recycled hydroponic system”
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