Abstract
Biogas effluent (BE) is a potential source of fertilizer for rice. Alternate wetting and drying (AWD) irrigation based on surface water level can increase rice grain yield (GY), but its effect under BE application is still unclear. To test whether AWD can increase GY under BE application, we conducted a mesocosm experiment under screen-house conditions in Can Tho, Vietnam. We measured rice growth and yield under three nitrogen (N) treatments—zero-N (Z), synthetic fertilizer (SF), and BE—and two irrigation regimes—continuous flooding (CF) and AWD with a re-irrigation threshold of 15 cm below the soil surface. Chlorophyll content (SPAD) and leaf color chart (LCC) values were higher in SF than in BE, but plant height was comparable. Although GY was not significantly different between CF and AWD, AWD increased it by 12% in BE relative to CF. All N use efficiency (NUE) indices (apparent N recovery, agronomic NUE, and internal NUE) were comparable between AWD and CF in BE and SF. The results indicate that AWD irrigation is feasible under the application of cattle BE and the combination can improve rice GY.
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Claims 7
Claim · model-written summary
Synthetic fertilizer produced higher rice chlorophyll content than biogas effluent.
- Taxon
- rice
Oryza sativat0 - Treatment
- SFe0
- Outcome
- Chlorophyll content (SPAD)e0
- Direction
- highere0
- Comparator
- BEe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll content (SPAD) and leaf color chart (LCC) values were higher in SF than in BE, but plant height was comparable.”
t0“Rice”
Claim · model-written summary
Synthetic fertilizer produced higher leaf color chart values than biogas effluent.
- Taxon
- RiceOryza sativat0
- Treatment
- SFe0
- Outcome
- leaf color chart (LCC) valuese0
- Direction
- highere0
- Comparator
- BEe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll content (SPAD) and leaf color chart (LCC) values were higher in SF than in BE, but plant height was comparable.”
t0“Rice”
Claim · model-written summary
Rice height was comparable under synthetic fertilizer and biogas effluent.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll content (SPAD) and leaf color chart (LCC) values were higher in SF than in BE, but plant height was comparable.”
t0“Rice”
Claim · model-written summary
Grain yield did not differ significantly between irrigation regimes.
- Taxon
- RiceOryza sativat0
- Treatment
- AWDe0
- Outcome
- GYe0
- Direction
- not significantly differente0
- Comparator
- CFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although GY was not significantly different between CF and AWD, AWD increased it by 12% in BE relative to CF.”
t0“Rice”
Claim · model-written summary
Under biogas effluent, AWD increased rice grain yield 12% relative to flooding.
- Taxon
- RiceOryza sativat0
- Treatment
- AWDe0
- Outcome
- GYe0
- Direction
- increasede0
- Value
- 12%e0
- Qualifier
- in BEe0
- Comparator
- CFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although GY was not significantly different between CF and AWD, AWD increased it by 12% in BE relative to CF.”
t0“Rice”
Claim · model-written summary
Nitrogen use efficiency indices were comparable between AWD and continuous flooding with biogas effluent and synthetic fertilizer.
- Taxon
- RiceOryza sativat0
- Treatment
- AWDe0
- Outcome
- apparent N recovery, agronomic NUE, and internal NUEe0
- Direction
- comparablee0
- Qualifier
- in BE and SFe0
- Comparator
- CFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All N use efficiency (NUE) indices (apparent N recovery, agronomic NUE, and internal NUE) were comparable between AWD and CF in BE and SF.”
t0“Rice”
Claim · model-written summary
The authors conclude that AWD with cattle biogas effluent is feasible and can improve rice grain yield.
- Taxon
- RiceOryza sativat0
- Outcome
- AWD irrigation is feasible under the application of cattle BE and the combination can improve rice GYe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results indicate that AWD irrigation is feasible under the application of cattle BE and the combination can improve rice GY.”
t0“Rice”
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