Abstract
Two rice cultivars (Xiushui 09 and Chunyou 84) were used to evaluate the effects of various soil oxygen (O2) conditions on soil nitrogen (N) transformation, absorption and accumulation in rice plants. The treatments were continuous flooding (CF), continuous flooding and aeration (CFA), and alternate wetting and drying (AWD). The results showed that the AWD and CFA treatments improved soil N transformation, rice growth, and N absorption and accumulation. Soil NO3– content, nitrification activity and ammonia-oxidising bacteria abundance, leaf area, nitrate reductase activity, and N absorption and accumulation in rice all increased in both cultivars. However, soil microbial biomass carbon and pH did not significantly change during the whole period of rice growth. Correlation analysis revealed a significant positive correlation between the nitrification activity and ammonia-oxidising bacteria abundance, and both of them significantly increased as the total N accumulation in rice increased. Our results indicated that improved soil O2 conditions led to changing soil N cycling and contributed to increases in N absorption and accumulation by rice in paddy fields.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by-nc-nd. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 7
Claim · model-written summary
Alternate wetting and drying improved soil N transformation, rice growth, and N absorption and accumulation relative to continuous flooding.
- Taxon
- rice
Oryza sativae1 - Treatment
- AWDe1
- Outcome
- soil N transformation, rice growth, and N absorption and accumulatione1
- Direction
- improvede1
- Comparator
- CFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatments were continuous flooding (CF), continuous flooding and aeration (CFA), and alternate wetting and drying (AWD)”
e1“The results showed that the AWD and CFA treatments improved soil N transformation, rice growth, and N absorption and accumulation”
Claim · model-written summary
Continuous flooding with aeration improved soil N transformation, rice growth, and N absorption and accumulation relative to continuous flooding.
- Taxon
- riceOryza sativae1
- Treatment
- CFAe1
- Outcome
- soil N transformation, rice growth, and N absorption and accumulatione1
- Direction
- improvede1
- Comparator
- CFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatments were continuous flooding (CF), continuous flooding and aeration (CFA), and alternate wetting and drying (AWD)”
e1“The results showed that the AWD and CFA treatments improved soil N transformation, rice growth, and N absorption and accumulation”
Claim · model-written summary
AWD and CFA treatments increased soil NO3– content, nitrification activity and ammonia-oxidising bacteria abundance in both rice cultivars.
- Taxon
- riceOryza sativae2
- Material
- Xiushui 09 and Chunyou 84e3
- Treatment
- AWD and CFA treatmentse1
- Outcome
- Soil NO3– content, nitrification activity and ammonia-oxidising bacteria abundancee2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The results showed that the AWD and CFA treatments improved soil N transformation, rice growth, and N absorption and accumulation”
e2“Soil NO3– content, nitrification activity and ammonia-oxidising bacteria abundance, leaf area, nitrate reductase activity, and N absorption and accumulation in rice all increased in both cultivars”
e3“Two rice cultivars (Xiushui 09 and Chunyou 84) were used”
Claim · model-written summary
AWD and CFA treatments increased leaf area, nitrate reductase activity, and N absorption and accumulation in rice in both cultivars.
- Taxon
- riceOryza sativae2
- Treatment
- AWD and CFA treatmentse1
- Outcome
- leaf area, nitrate reductase activity, and N absorption and accumulation in ricee2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The results showed that the AWD and CFA treatments improved soil N transformation, rice growth, and N absorption and accumulation”
e2“Soil NO3– content, nitrification activity and ammonia-oxidising bacteria abundance, leaf area, nitrate reductase activity, and N absorption and accumulation in rice all increased in both cultivars”
Claim · model-written summary
Soil microbial biomass carbon and pH did not significantly change during rice growth.
- Taxon
- riceOryza sativae4
- Outcome
- soil microbial biomass carbon and pHe4
- Direction
- did not significantly changee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“However, soil microbial biomass carbon and pH did not significantly change during the whole period of rice growth”
Claim · model-written summary
Nitrification activity was significantly positively correlated with ammonia-oxidising bacteria abundance.
- Taxon
- riceOryza sativae5
- Interactor
- ammonia-oxidising bacteriae5other
- Outcome
- nitrification activitye5
- Direction
- positive correlatione5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Correlation analysis revealed a significant positive correlation between the nitrification activity and ammonia-oxidising bacteria abundance, and both of them significantly increased as the total N accumulation in rice increased”
Claim · model-written summary
Nitrification activity and ammonia-oxidising bacteria abundance both significantly increased as total N accumulation in rice increased.
- Taxon
- riceOryza sativae5
- Interactor
- ammonia-oxidising bacteriae5other
- Outcome
- total N accumulation in ricee5
- Direction
- increasede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Correlation analysis revealed a significant positive correlation between the nitrification activity and ammonia-oxidising bacteria abundance, and both of them significantly increased as the total N accumulation in rice increased”
The same questions in other papers
flooding · physiology: enzyme activity · Oryza sativa (rice)Positive and negative results
4 papers in the same direction as this paper · 4 in the opposite direction
- negative
- negative
- negative
5 papers more in this group
See all 9 papers →flooding · pest · Oryza sativa (rice)Positive and negative results
6 papers in the same direction as this paper · 9 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- negative
13 papers more in this group
See all 17 papers →irrigation · pest · Oryza sativa (rice)Positive and negative results
16 papers in the same direction as this paper · 3 in the opposite direction
- negative
- negative
- negative
16 papers more in this group
See all 20 papers →flooding · growth · Oryza sativa (rice)Positive and negative results
63 papers in the same direction as this paper · 72 in the opposite direction · 2 reporting no difference from an alternative
- negative
- no effect
- negative
134 papers more in this group
See all 138 papers →irrigation · growth · Oryza sativa (rice)Positive and negative results
221 papers in the same direction as this paper · 62 in the opposite direction · 7 reporting no difference from an alternative
- positive
- positive
- negative
287 papers more in this group
See all 291 papers →irrigation · physiology: enzyme activity · Oryza sativa (rice)Results agree
12 papers in the same direction as this paper
- positive
- positive
- positive
9 papers more in this group
See all 13 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.