Abstract
We conducted a 12-year field experiment to study the combined effects of rice straw compost and chemical fertilizer application on a double rice cropping system in the Mekong Delta, Vietnam and established 7 treatments using a randomized block design with 3 replications. We calculated the yields of treatments relative to those of conventionally fertilized plots (i.e. with no added rice straw compost), and analyzed their annual trends. In the plots with rice straw compost, we observed a positive trend over 12 continuous wet cropping seasons. In comparison with conventional fertilization, the application of rice straw compost with reduced chemical fertilizer can maintain rice productivity over a longer period. We analyzed the nutrient status of the rice straw at harvest over 4 cropping seasons and observed that the Si concentration of the rice straw in conventionally fertilized plots was significantly lower than that in the plots where rice straw compost was applied. The N, P and Mg concentrations of the rice straw increased with the fertilizer application rate, while the concentrations of K, Ca, Mn, Fe, Zn, and Cu did not differ significantly among treatments. Our results suggest that continuous removal of rice straw may reduce the Si availability in soil, thereby decreasing rice productivity. In addition, we verified that rice straw compost can be an effective source of silicon for paddy rice.
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Claims 8
Claim · model-written summary
Rice straw compost plots showed a positive yield trend over 12 wet cropping seasons.
- Taxon
- rice
Oryza sativat0 - Treatment
- rice straw composte0
- Outcome
- positive trende0
- Direction
- positivee0
- Qualifier
- 12 continuous wet cropping seasonse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Schema note from the model: Title taxon evidence added separately
Verbatim
e0“In the plots with rice straw compost, we observed a positive trend over 12 continuous wet cropping seasons.”
t0“Rice Yield”
Claim · model-written summary
Rice straw compost with reduced chemical fertilizer maintained rice productivity longer than conventional fertilization.
- Taxon
- riceOryza sativat0
- Treatment
- rice straw compost with reduced chemical fertilizere0
- Outcome
- rice productivitye0
- Direction
- maintaine0
- Comparator
- conventional fertilizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In comparison with conventional fertilization, the application of rice straw compost with reduced chemical fertilizer can maintain rice productivity over a longer period.”
t0“Rice Yield”
Claim · model-written summary
Conventionally fertilized plots had significantly lower rice-straw Si concentration than compost plots.
- Taxon
- riceOryza sativae0
- Treatment
- conventionally fertilized plotse0
- Outcome
- Si concentration of the rice strawe0
- Direction
- lowere0
- Comparator
- plots where rice straw compost was appliede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the Si concentration of the rice straw in conventionally fertilized plots was significantly lower than that in the plots where rice straw compost was applied.”
Claim · model-written summary
Rice-straw N, P and Mg concentrations increased with fertilizer application rate.
- Taxon
- riceOryza sativae0
- Treatment
- fertilizer application ratee0
- Outcome
- N, P and Mg concentrations of the rice strawe0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N, P and Mg concentrations of the rice straw increased with the fertilizer application rate”
Claim · model-written summary
Rice-straw K, Ca and Mn concentrations did not differ significantly among treatments.
- Taxon
- riceOryza sativat0
- Treatment
- treatmentse0
- Outcome
- concentrations of K, Ca, Mne0
- Direction
- did not differe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentrations of K, Ca, Mn, Fe, Zn, and Cu did not differ significantly among treatments.”
t0“Rice Yield”
Claim · model-written summary
Rice-straw Fe, Zn and Cu concentrations did not differ significantly among treatments.
- Taxon
- riceOryza sativat0
- Treatment
- treatmentse0
- Outcome
- Fe, Zn, and Cue0
- Direction
- did not differe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentrations of K, Ca, Mn, Fe, Zn, and Cu did not differ significantly among treatments.”
t0“Rice Yield”
Claim · model-written summary
Continuous rice straw removal may reduce soil Si availability and thereby rice productivity.
- Taxon
- riceOryza sativae0
- Treatment
- continuous removal of rice strawe0
- Outcome
- rice productivitye0
- Direction
- decreasinge0
- Qualifier
- Si availability in soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“continuous removal of rice straw may reduce the Si availability in soil, thereby decreasing rice productivity.”
Claim · model-written summary
Rice straw compost was an effective silicon source for paddy rice.
- Taxon
- riceOryza sativae0
- Treatment
- rice straw composte0
- Outcome
- effective source of silicone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice straw compost can be an effective source of silicon for paddy rice.”
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