Abstract
Amending reservoir sediments with organic matter provides a sustainable alternative to conventional rice (Oryza sativa L.) seedling substrates, simultaneously reducing dependence on agricultural soils and promoting the recycling of dredged sediments and agricultural by-products. Preliminary tests showed that adding rice husk (RH) improved the porosity and water retention of the sediments while preventing surface cracking. This study further examined the effects of RH and rice husk biochar (RHB) on sediment fertility and rice seedling growth. Seedlings were grown for 15 days in a fine- or coarse-texture sediment amended with 0, 5, 10, or 20% (w/w) RH or RHB. A 10% amendment was identified as the optimal ratio for promoting seedling growth (increasing ca. 20% biomass). Nitrogen (N) availability was the primary factor influencing seedling performance, outweighing the effects of salinity and phosphorus availability. Compared with RH, RHB amendment resulted in lower substrate available N, likely due to greater losses through denitrification and ammonia volatilization, leading to reduced growth. In contrast, RH amendment maintained higher levels of available N, resulting in greater shoot biomass and higher leaf chlorophyll concentrations. Overall, amending reservoir sediments with 10% RH provides the most effective substrate formulation, offering a practical and sustainable strategy for rice seedling production.
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Claims 10
Claim · model-written summary
Rice husk increased sediment porosity and water retention.
Not reportedTaxonComparator
Verbatim
e0“adding rice husk (RH) improved the porosity and water retention of the sediments”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Rice husk prevented sediment surface cracking.
Not reportedTaxonComparator
Verbatim
e0“adding rice husk (RH) improved the porosity and water retention of the sediments while preventing surface cracking”
Claim · model-written summary
A 10% amendment optimized rice seedling growth and increased biomass about 20%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 10% amendment was identified as the optimal ratio for promoting seedling growth (increasing ca. 20% biomass)”
t0“Sustainable Rice Seedling Production”
Claim · model-written summary
Nitrogen availability was the primary factor influencing seedling performance.
- Taxon
- rice
Oryza sativat0 - Compound
- Nitrogen (N)e0
- Outcome
- seedling performancee0
- Qualifier
- outweighing the effects of salinity and phosphorus availabilitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen (N) availability was the primary factor influencing seedling performance, outweighing the effects of salinity and phosphorus availability”
t0“Sustainable Rice Seedling Production”
Claim · model-written summary
Biochar amendment reduced substrate available nitrogen relative to rice husk.
Not reportedTaxon
Verbatim
e0“Compared with RH, RHB amendment resulted in lower substrate available N”
t0“Sustainable Rice Seedling Production”
Claim · model-written summary
Biochar amendment reduced rice seedling growth relative to rice husk.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with RH, RHB amendment resulted in lower substrate available N, likely due to greater losses through denitrification and ammonia volatilization, leading to reduced growth”
t0“Sustainable Rice Seedling Production”
Claim · model-written summary
Rice husk amendment maintained higher available nitrogen.
Not reportedTaxonComparator
Verbatim
e0“RH amendment maintained higher levels of available N, resulting in greater shoot biomass and higher leaf chlorophyll concentrations”
t0“Sustainable Rice Seedling Production”
Claim · model-written summary
Rice husk amendment increased shoot biomass.
- Taxon
- riceOryza sativat0
- Treatment
- RH amendmente0
- Outcome
- shoot biomasse0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RH amendment maintained higher levels of available N, resulting in greater shoot biomass and higher leaf chlorophyll concentrations”
t0“Sustainable Rice Seedling Production”
Claim · model-written summary
Rice husk amendment increased leaf chlorophyll concentration.
- Taxon
- riceOryza sativat0
- Treatment
- RH amendmente0
- Outcome
- leaf chlorophyll concentrationse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RH amendment maintained higher levels of available N, resulting in greater shoot biomass and higher leaf chlorophyll concentrations”
t0“Sustainable Rice Seedling Production”
Claim · model-written summary
The authors recommend reservoir sediment amended with 10% rice husk for rice seedling production.
- Taxon
- riceOryza sativae0
- Treatment
- 10% RHe0
- Outcome
- most effective substrate formulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“amending reservoir sediments with 10% RH provides the most effective substrate formulation, offering a practical and sustainable strategy for rice seedling production”
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