Abstract
Abstract Nitrogen (N) is one of the main nutrients that drive rice grain yield and is intensely managed especially in lowlands under irrigated conditions. A set of experiments was conducted in mid‐ and high‐altitude sites in Rwanda to investigate the response of five genotypes under different sowing dates and different N management. Genotype grain yields were higher and more stable at mid‐altitude across sowing dates. N rates strongly affected grain yield at mid‐altitude ( p < .0001), but not at high altitude. Postponing basal N had positive effects on yield and yield components in both sites, with more pronounced effects at high altitude. Increasing N rate beyond 120 kg/ha led to a decrease in percentage of panicles per tiller and spikelet fertility and a decrease in grain yield due to excessive tillers at both high altitude and mid‐altitude. Thus, basal N application should be recommended at high altitude and the increase in N rate up to 120 kg/ha at mid‐altitude. A strict observation of recommended planting date should be followed at high altitude, and the use of cold‐tolerant genotypes is encouraged.
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Claims 10
Claim · model-written summary
Rice genotype grain yields were higher and more stable at mid-altitude across sowing dates.
- Taxon
- rice
Oryza sativae0 - Outcome
- grain yieldse1
- Direction
- highere1
- Qualifier
- more stablee1
- Setting
- mid‐altitudee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drive rice grain yield”
e1“Genotype grain yields were higher and more stable at mid‐altitude across sowing dates”
Claim · model-written summary
N rates strongly affected grain yield at mid-altitude.
- Taxon
- riceOryza sativae0
- Treatment
- N ratese1
- Outcome
- grain yielde1
- Qualifier
- p < .0001e1
- Comparator
- high altitudee1
- Setting
- mid‐altitudee1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drive rice grain yield”
e1“N rates strongly affected grain yield at mid‐altitude ( p < .0001), but not at high altitude”
Claim · model-written summary
N rates did not affect grain yield at high altitude.
- Taxon
- riceOryza sativae0
- Treatment
- N ratese1
- Outcome
- grain yielde1
- Comparator
- mid‐altitudee1
- Setting
- high altitudee1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drive rice grain yield”
e1“N rates strongly affected grain yield at mid‐altitude ( p < .0001), but not at high altitude”
Claim · model-written summary
Postponing basal N had positive effects on yield and yield components at both sites, more pronounced at high altitude.
- Taxon
- riceOryza sativae0
- Treatment
- Postponing basal Ne2
- Outcome
- yield and yield componentse2
- Direction
- increaseinferrede2
- Qualifier
- more pronounced effects at high altitudee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drive rice grain yield”
e2“Postponing basal N had positive effects on yield and yield components in both sites, with more pronounced effects at high altitude”
Claim · model-written summary
Increasing N rate beyond 120 kg/ha decreased the percentage of panicles per tiller and spikelet fertility.
- Taxon
- riceOryza sativae0
- Treatment
- Increasing N rate beyond 120 kg/hae3
- Outcome
- percentage of panicles per tiller and spikelet fertilitye3
- Direction
- decreasee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drive rice grain yield”
e3“Increasing N rate beyond 120 kg/ha led to a decrease in percentage of panicles per tiller and spikelet fertility”
Claim · model-written summary
Increasing N rate beyond 120 kg/ha decreased grain yield due to excessive tillers at high and mid-altitude.
- Taxon
- riceOryza sativae0
- Treatment
- Increasing N rate beyond 120 kg/hae3
- Outcome
- grain yielde4
- Direction
- decreasee4
- Qualifier
- due to excessive tillerse4
- Setting
- high altitude and mid‐altitudee4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drive rice grain yield”
e3“Increasing N rate beyond 120 kg/ha led to a decrease in percentage of panicles per tiller and spikelet fertility”
e4“a decrease in grain yield due to excessive tillers at both high altitude and mid‐altitude”
Claim · model-written summary
Basal N application should be recommended at high altitude.
- Taxon
- riceOryza sativae0
- Outcome
- basal N application should be recommendede5
- Setting
- high altitudee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drive rice grain yield”
e5“basal N application should be recommended at high altitude”
Claim · model-written summary
Increasing N rate up to 120 kg/ha should be recommended at mid-altitude.
- Taxon
- riceOryza sativae0
- Outcome
- increase in N rate up to 120 kg/hae6
- Setting
- mid‐altitudee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drive rice grain yield”
e6“the increase in N rate up to 120 kg/ha at mid‐altitude”
Claim · model-written summary
A strict observation of the recommended planting date should be followed at high altitude.
- Taxon
- riceOryza sativae0
- Outcome
- strict observation of recommended planting datee7
- Setting
- high altitudee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drive rice grain yield”
e7“A strict observation of recommended planting date should be followed at high altitude”
Claim · model-written summary
Use of cold-tolerant genotypes is encouraged.
- Taxon
- riceOryza sativae0
- Material
- cold‐tolerant genotypese6
- Outcome
- use of cold‐tolerant genotypese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drive rice grain yield”
e6“the use of cold‐tolerant genotypes is encouraged”
The same questions in other papers
nitrogen · yield · Oryza sativa (rice)Positive and negative results
241 papers in the same direction as this paper · 1,803 in the opposite direction
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