Abstract
Ratoon rice enhances yield per unit area through efficient resource use, but the interactive effects of irrigation regime and nitrogen (N) rate on its productivity remain unclear. A two-year field experiment was conducted to assess the effects of two irrigation regimes—conventional flooding irrigation (CF) and alternate wetting and moderate soil drying irrigation (WMD)—combined with five N application rates on yield, agronomic productivity, root oxidation activity (ROA), soil chemical properties, and N use efficiency (NUE) in the rice cultivar Liangyou 6326. The results showed that compared with CF, WMD increased spikelets number per panicle, total spikelet number, and filled grain rate in both main and ratoon crop, thereby enhancing the yields by 11.0% and 16.1%, respectively. These improvements were linked to elevated soil N, phosphorus, potassium content, and cation exchange capacity under WMD, which enhanced photosynthesis, ROA and dry matter production. While the interaction between N rates and irrigation regimes on yield were nonsignificant, CF exhibited declining photosynthetic capacity, yield, and NUE with reduced N. Conversely, WMD showed initial increases followed by declines, peaking at 427.5 kg N/ha (243 kg ha -1 main crop; 184.5 kg ha -1 ratoon crop). This study provides actionable strategies for sustainable ratoon rice systems by balancing water and N inputs.
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Claims 6
Claim · model-written summary
Alternate wetting and moderate soil drying irrigation increased spikelets number per panicle, total spikelet number and filled grain rate in both main and ratoon rice crops.
- Taxon
- rice
Oryza sativae1 - Material
- Liangyou 6326e1
- Treatment
- alternate wetting and moderate soil drying irrigatione3
- Outcome
- spikelets number per panicle, total spikelet number, and filled grain ratee4
- Direction
- increasede4
- Qualifier
- in both main and ratoon crope4
- Comparator
- conventional flooding irrigatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“in the rice cultivar Liangyou 6326”
e2“conventional flooding irrigation (CF)”
e3“alternate wetting and moderate soil drying irrigation (WMD)”
e4“WMD increased spikelets number per panicle, total spikelet number, and filled grain rate in both main and ratoon crop”
Claim · model-written summary
Alternate wetting and moderate soil drying irrigation enhanced rice yields by 11.0% and 16.1%, respectively.
- Taxon
- riceOryza sativae1
- Treatment
- alternate wetting and moderate soil drying irrigatione3
- Outcome
- yieldse5
- Direction
- enhancinge5
- Value
- 11.0% and 16.1%e5
- Qualifier
- respectivelye5
- Comparator
- conventional flooding irrigatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“in the rice cultivar Liangyou 6326”
e2“conventional flooding irrigation (CF)”
e3“alternate wetting and moderate soil drying irrigation (WMD)”
e5“thereby enhancing the yields by 11.0% and 16.1%, respectively”
Claim · model-written summary
Improvements under alternate wetting and moderate soil drying irrigation were linked to elevated soil N, P and K and cation exchange capacity, which enhanced photosynthesis, root oxidation activity and dry matter production.
- Taxon
- riceOryza sativae1
- Outcome
- photosynthesis, ROA and dry matter productione7
- Qualifier
- elevated soil N, phosphorus, potassium content, and cation exchange capacity under WMDe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“in the rice cultivar Liangyou 6326”
e6“elevated soil N, phosphorus, potassium content, and cation exchange capacity under WMD”
e7“which enhanced photosynthesis, ROA and dry matter production”
Claim · model-written summary
The interaction between N rate and irrigation regime on rice yield was nonsignificant.
- Taxon
- riceOryza sativae1
- Outcome
- interaction between N rates and irrigation regimes on yielde2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“in the rice cultivar Liangyou 6326”
e2“the interaction between N rates and irrigation regimes on yield were nonsignificant”
Claim · model-written summary
Under conventional flooding irrigation, photosynthetic capacity, yield and NUE declined with reduced N in rice.
- Taxon
- riceOryza sativae1
- Treatment
- reduced Ne2
- Outcome
- photosynthetic capacity, yield, and NUEe2
- Direction
- declininge2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“in the rice cultivar Liangyou 6326”
e2“CF exhibited declining photosynthetic capacity, yield, and NUE with reduced N”
Claim · model-written summary
Under alternate wetting and moderate soil drying irrigation, rice showed initial increases followed by declines, peaking at 427.5 kg N/ha.
- Taxon
- riceOryza sativae1
- Outcome
- initial increases followed by declinese2
- Value
- 427.5 kg N/hae2
- Qualifier
- 243 kg ha -1 main crop; 184.5 kg ha -1 ratoon crope3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“in the rice cultivar Liangyou 6326”
e2“WMD showed initial increases followed by declines, peaking at 427.5 kg N/ha”
e3“243 kg ha -1 main crop; 184.5 kg ha -1 ratoon crop”
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