Abstract
Grain yields of two semi-dwarf varieties of rice were compared over a range of 0-225 kg applied nitrogen/ha in two seasons with yields of the tall varieties Calrose and Kulu, which were their major recurrent parents. Harvested yields of the semi-dwarfs increased over the entire range whereas those of Calrose and Kulu decreased above 100-150 kg nitrogen/ha. This appeared to be associated with a decrease in the number of panicleslm2 in the first season, and the inadequacy of the harvester to recover as much grain from lodged as unlodged crops in the second. Lodging was extensive in both experiments when the tall varieties received high applications of nitrogen, but was absent in the semidwarf varieties at all nitrogen levels. This appeared to influence the harvesting much more than the production of grain. However, it is suggested that other factors are also involved.The results indicated that the semi-dwarf character incorporated into current varieties could increase yields by about 1 t/ha with high nitrogen applications.
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Claims 8
Claim · model-written summary
Yields of the semi-dwarf varieties increased over the entire nitrogen range.
- Taxon
- rice
Oryza sativae0 - Material
- semi-dwarfse1
- Treatment
- applied nitrogene0
- Outcome
- Harvested yieldse1
- Direction
- increasede1
- Qualifier
- over the entire rangee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields of two semi-dwarf varieties of rice were compared over a range of 0-225 kg applied nitrogen/ha”
e1“Harvested yields of the semi-dwarfs increased over the entire range whereas those of Calrose and Kulu decreased above 100-150 kg nitrogen/ha”
Claim · model-written summary
Yields of the tall varieties Calrose and Kulu decreased above 100-150 kg nitrogen/ha.
- Taxon
- riceOryza sativae0
- Material
- Calrose and Kulue1
- Treatment
- 100-150 kg nitrogen/hae1
- Outcome
- Harvested yieldse1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields of two semi-dwarf varieties of rice were compared over a range of 0-225 kg applied nitrogen/ha”
e1“Harvested yields of the semi-dwarfs increased over the entire range whereas those of Calrose and Kulu decreased above 100-150 kg nitrogen/ha”
Claim · model-written summary
Lodging was extensive in tall varieties at high nitrogen applications.
- Taxon
- riceOryza sativae0
- Material
- tall varietiese2
- Treatment
- high applications of nitrogene2
- Outcome
- Lodginge2
- Qualifier
- extensive in both experimentse2
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields of two semi-dwarf varieties of rice were compared over a range of 0-225 kg applied nitrogen/ha”
e2“Lodging was extensive in both experiments when the tall varieties received high applications of nitrogen, but was absent in the semidwarf varieties at all nitrogen levels”
Claim · model-written summary
Lodging was absent in semi-dwarf varieties at all nitrogen levels.
- Taxon
- riceOryza sativae0
- Material
- semidwarf varietiese2
- Treatment
- at all nitrogen levelse2
- Outcome
- Lodginge2
- Qualifier
- absente2
- Comparator
- tall varietiese2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields of two semi-dwarf varieties of rice were compared over a range of 0-225 kg applied nitrogen/ha”
e2“Lodging was extensive in both experiments when the tall varieties received high applications of nitrogen, but was absent in the semidwarf varieties at all nitrogen levels”
Claim · model-written summary
Number of panicles per square metre decreased in the first season with nitrogen.
- Taxon
- riceOryza sativae0
- Outcome
- number of panicleslm2e3
- Direction
- decreasee3
- Setting
- first seasone3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields of two semi-dwarf varieties of rice were compared over a range of 0-225 kg applied nitrogen/ha”
e3“This appeared to be associated with a decrease in the number of panicleslm2 in the first season”
Claim · model-written summary
Harvester inadequacy to recover grain from lodged crops explains lower recovered yields of tall varieties in the second season.
- Taxon
- riceOryza sativae0
- Outcome
- to recover as much grain from lodged as unlodged cropse4
- Qualifier
- the inadequacy of the harvestere4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields of two semi-dwarf varieties of rice were compared over a range of 0-225 kg applied nitrogen/ha”
e4“the inadequacy of the harvester to recover as much grain from lodged as unlodged crops in the second”
Claim · model-written summary
Lodging influenced harvesting much more than grain production.
- Taxon
- riceOryza sativae0
- Outcome
- the harvestinge5
- Qualifier
- much more than the production of graine5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields of two semi-dwarf varieties of rice were compared over a range of 0-225 kg applied nitrogen/ha”
e5“This appeared to influence the harvesting much more than the production of grain”
Claim · model-written summary
Semi-dwarf character could increase yields by about 1 t/ha with high nitrogen applications.
- Taxon
- riceOryza sativae0
- Material
- semi-dwarf charactere6
- Treatment
- high nitrogen applicationse6
- Outcome
- yieldse6
- Direction
- increasee6
- Value
- about 1 t/hae6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields of two semi-dwarf varieties of rice were compared over a range of 0-225 kg applied nitrogen/ha”
e6“The results indicated that the semi-dwarf character incorporated into current varieties could increase yields by about 1 t/ha with high nitrogen applications”
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See all 2,045 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.