Abstract
We conducted a series of field experiments to study the effects of rice straw compost (RSC) and chemical fertilizer application on soil carbon and silicon under a double rice cropping system for 25 crops successive in the Mekong Delta, Vietnam. The results showed that the continuous application of RSC (6 Mg ha－1 as fresh weight for each crop) caused a higher yield and more available silicon than treatment without RSC. Available silicon in the surface (0 - 10 cm from the ground surface) soil was 36.3 to 38.7 mg Si kg－1 in treatment with RSC, while it was 24.2 to 30.0 mg Si kg－1 for treatment without RSC. Regardless the amount of chemical fertilizer applied, the rice yields for treatment without RSC were lower than those for treatment with RSC and entailed less chemical fertilizer. Moreover, RSC application used in combination with moderate doses of chemical fertilizer increased total carbon in the soil at a rate of 356 to 401 kg C ha－1 year－1. Our results suggested that Si availability in paddy soil must be maintained or increased in order to maintain rice yield, for which the application of rice straw compost offers an option. Our results also showed that the application of RSC increased total-C in the soil, suggesting that paddy fields can be used effectively for carbon sequestration.
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Claims 5
Claim · model-written summary
Continuous application of rice straw compost (6 Mg ha-1 fresh weight per crop) gave a higher rice yield than treatment without rice straw compost.
- Taxon
- rice
Oryza sativae0 - Treatment
- continuous application of RSC (6 Mg ha－1 as fresh weight for each crop)e1
- Outcome
- yielde1
- Direction
- highere1
- Comparator
- treatment without RSCe1
- Setting
- Mekong Delta, Vietname0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“double rice cropping system for 25 crops successive in the Mekong Delta, Vietnam”
e1“the continuous application of RSC (6 Mg ha－1 as fresh weight for each crop) caused a higher yield and more available silicon than treatment without RSC”
Claim · model-written summary
Available silicon in the 0-10 cm surface soil was 36.3 to 38.7 mg Si kg-1 with rice straw compost versus 24.2 to 30.0 mg Si kg-1 without it.
- Taxon
- riceOryza sativae0
- Treatment
- treatment with RSCe2
- Outcome
- Available silicon in the surface (0 - 10 cm from the ground surface) soile2
- Direction
- higherinferrede2
- Value
- 36.3 to 38.7 mg Si kg－1e2
- Qualifier
- 24.2 to 30.0 mg Si kg－1e2
- Comparator
- treatment without RSCe2
- Setting
- Mekong Delta, Vietname0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“double rice cropping system for 25 crops successive in the Mekong Delta, Vietnam”
e2“Available silicon in the surface (0 - 10 cm from the ground surface) soil was 36.3 to 38.7 mg Si kg－1 in treatment with RSC, while it was 24.2 to 30.0 mg Si kg－1 for treatment without RSC”
Claim · model-written summary
Regardless of the chemical fertilizer amount, rice yields without rice straw compost were lower than with it, and needed less chemical fertilizer.
- Taxon
- riceOryza sativae3
- Treatment
- treatment with RSCe3
- Outcome
- rice yieldse3
- Direction
- lowere3
- Comparator
- treatment without RSCe3
- Setting
- Mekong Delta, Vietname0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“double rice cropping system for 25 crops successive in the Mekong Delta, Vietnam”
e3“Regardless the amount of chemical fertilizer applied, the rice yields for treatment without RSC were lower than those for treatment with RSC and entailed less chemical fertilizer”
Claim · model-written summary
Rice straw compost combined with moderate doses of chemical fertilizer increased total soil carbon at 356 to 401 kg C ha-1 year-1.
- Taxon
- riceOryza sativae0
- Treatment
- RSC application used in combination with moderate doses of chemical fertilizere4
- Outcome
- total carbon in the soile4
- Direction
- increasede4
- Value
- 356 to 401 kg C ha－1 year－1e4
- Setting
- Mekong Delta, Vietname0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“double rice cropping system for 25 crops successive in the Mekong Delta, Vietnam”
e4“RSC application used in combination with moderate doses of chemical fertilizer increased total carbon in the soil at a rate of 356 to 401 kg C ha－1 year－1”
Claim · model-written summary
The authors conclude that silicon availability in paddy soil must be maintained or increased to maintain rice yield, and that rice straw compost is an option for this.
- Taxon
- riceOryza sativae5
- Outcome
- maintain rice yielde5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Si availability in paddy soil must be maintained or increased in order to maintain rice yield, for which the application of rice straw compost offers an option”
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