Abstract
The nitrogen use efficiency and balance of different fertilizer level and methods under traditional continuous flooding irrigation and alternative wetting and drying irrigation by using lysimeter and isotope tracer technique.The results showed that the nitrogen accumulation in grain was about a half of the total amount in rice plant,the difference of nitrogen accumulation between water saving irrigation and traditional flooding irrigation presented on stem,green leaves,and grain,no significant difference on yellow leaves and unfilled grain;the nitrogen use efficiency acquired by minusing method was higher than that by isotope tracer technique,however the nitrogen use efficiency under alternative wetting and drying irrigation was higher than that under continuous flooding irrigation by the two methods,and that of low nitrogen level was higher than high nitrogen level;according to the calculation of nitrogen balance by isotope tracer technique,the nitrogen allocation in the lowland rice system presented that NH3 ammonia volatilation was 37.4%~51.7% percent,the soil nitrogen residue is 20.4%~37.7% percent,crop utilization is 9.2%~36.4% percent,and leaching is 0.3%~16.4% percent.
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Claims 10
Claim · model-written summary
About half of the total nitrogen in rice plants accumulated in the grain.
- Taxon
- rice
Oryza sativae1 - Organ / stage
- graine1
- Outcome
- nitrogen accumulation in graine1
- Value
- about a halfe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the nitrogen accumulation in grain was about a half of the total amount in rice plant”
Claim · model-written summary
Nitrogen accumulation differed between water saving and traditional flooding irrigation on stem, green leaves and grain.
- Taxon
- riceOryza sativat0
- Organ / stage
- stem, green leaves, and graine2
- Treatment
- water saving irrigatione2
- Outcome
- nitrogen accumulatione2
- Direction
- differencee2
- Comparator
- traditional flooding irrigatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lowland Rice Field”
e2“the difference of nitrogen accumulation between water saving irrigation and traditional flooding irrigation presented on stem, green leaves, and grain”
Claim · model-written summary
No significant difference in nitrogen accumulation between water saving and flooding irrigation on yellow leaves and unfilled grain.
- Taxon
- riceOryza sativat0
- Treatment
- water saving irrigatione2
- Outcome
- yellow leaves and unfilled graine3
- Direction
- no significant differencee3
- Comparator
- traditional flooding irrigatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lowland Rice Field”
e2“the difference of nitrogen accumulation between water saving irrigation and traditional flooding irrigation presented on stem, green leaves, and grain”
e3“no significant difference on yellow leaves and unfilled grain”
Claim · model-written summary
The minus method gave higher nitrogen use efficiency in rice than the isotope tracer technique.
- Taxon
- riceOryza sativat0
- Outcome
- nitrogen use efficiencye4
- Direction
- highere4
- Comparator
- isotope tracer techniquee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lowland Rice Field”
e4“the nitrogen use efficiency acquired by minusing method was higher than that by isotope tracer technique”
Claim · model-written summary
Nitrogen use efficiency was higher under alternate wetting and drying irrigation than under continuous flooding irrigation.
- Taxon
- riceOryza sativat0
- Treatment
- alternative wetting and drying irrigatione5
- Outcome
- nitrogen use efficiencye5
- Direction
- highere5
- Comparator
- continuous flooding irrigatione5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lowland Rice Field”
e5“the nitrogen use efficiency under alternative wetting and drying irrigation was higher than that under continuous flooding irrigation by the two methods”
Claim · model-written summary
Nitrogen use efficiency was higher at low than at high nitrogen level.
- Taxon
- riceOryza sativat0
- Treatment
- low nitrogen levele6
- Outcome
- nitrogen use efficiencye5
- Direction
- highere6
- Comparator
- high nitrogen levele6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lowland Rice Field”
e5“the nitrogen use efficiency under alternative wetting and drying irrigation was higher than that under continuous flooding irrigation by the two methods”
e6“that of low nitrogen level was higher than high nitrogen level”
Claim · model-written summary
Isotope tracer balance attributes 37.4% to 51.7% of nitrogen in lowland rice to NH3 volatilisation.
- Taxon
- riceOryza sativae7
- Outcome
- NH3 ammonia volatilatione7
- Value
- 37.4%~51.7% percente7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“the nitrogen allocation in the lowland rice system presented that NH3 ammonia volatilation was 37.4%~51.7% percent”
Claim · model-written summary
Isotope tracer balance attributes 20.4% to 37.7% of nitrogen in lowland rice to soil residue.
- Taxon
- riceOryza sativae0
- Outcome
- soil nitrogen residuee1
- Value
- 20.4%~37.7% percente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the nitrogen allocation in the lowland rice system presented that NH3 ammonia volatilation was 37.4%~51.7% percent”
e1“the soil nitrogen residue is 20.4%~37.7% percent”
Claim · model-written summary
Isotope tracer balance attributes 9.2% to 36.4% of nitrogen in lowland rice to crop utilisation.
- Taxon
- riceOryza sativae0
- Outcome
- crop utilizatione1
- Value
- 9.2%~36.4% percente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the nitrogen allocation in the lowland rice system presented that NH3 ammonia volatilation was 37.4%~51.7% percent”
e1“crop utilization is 9.2%~36.4% percent”
Claim · model-written summary
Isotope tracer balance attributes 0.3% to 16.4% of nitrogen in lowland rice to leaching.
- Taxon
- riceOryza sativae0
- Outcome
- leachinge1
- Value
- 0.3%~16.4% percente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the nitrogen allocation in the lowland rice system presented that NH3 ammonia volatilation was 37.4%~51.7% percent”
e1“leaching is 0.3%~16.4% percent”
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