Abstract
Field research was conducted for 2 yr to investigate the relationship between rice ( Oryza sativa L.) seeding rate and preflood nitrogen (N) rate utilizing long‐grain rice cultivars planted into clay and silt loam soils. Rice cultivars included ‘Cheniere’ and ‘Wells’ seeded at 162, 323, and 646 seeds m −2 . Nitrogen was applied before flooding at 67, 134, and 202 kg ha −1 . No response to soil texture and no interaction between seeding rate and N rate were detected for the parameters examined. The lowest applied N rate had lower yield than the other two N rates. Rough rice yields were 7564 for 67 kg N ha −1 , 8520 for 134 kg N ha −1 , and 9000 for 202 kg N ha −1 averaged over all cultivars, seeding rates, and soil textures. Similarly, when head rice yield was pooled across soil texture and seeding rate, head rice yield of Cheniere was independent of N rate, but head rice yield of Wells increased when the N rate was increased from 67 to 202 kg ha −1 . Panicle density responded to N rate similar to rough rice yield. Panicle density increased with seeding rate up to 418 panicles m −2 at a seeding rate of 646 seeds m −2 . Filled grain panicle −1 was highest at a seeding rate of 162 seeds m −2 . Cheniere produced more filled grain panicle −1 while Wells had a higher 1000‐grain weight. Grain yield and yield components of Cheniere and Wells respond to seeding rates and N rates independently when planted into clay or silt loam soils.
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Claims 12
Claim · model-written summary
Soil texture had no detected response and seeding by nitrogen interaction was absent.
- Taxon
- Rice
Oryza sativat0 - Treatment
- soil texturee0
- Outcome
- parameters examinede0
- Direction
- No responsee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No response to soil texture and no interaction between seeding rate and N rate were detected for the parameters examined”
t0“Rice Cultivars”
Claim · model-written summary
The lowest nitrogen rate gave lower rough rice yield than the two higher rates.
- Taxon
- RiceOryza sativat0
- Treatment
- lowest applied N ratee0
- Outcome
- yielde0
- Direction
- lowere0
- Comparator
- other two N ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lowest applied N rate had lower yield than the other two N rates”
t0“Rice Cultivars”
Claim · model-written summary
Rough rice yields were 7564, 8520, and 9000 at 67, 134, and 202 kg N ha−1 respectively.
- Taxon
- RiceOryza sativat0
- Treatment
- 67 kg N ha −1e0
- Outcome
- Rough rice yieldse0
- Direction
- lowerinferrede0
- Value
- 7564e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rough rice yields were 7564 for 67 kg N ha −1 , 8520 for 134 kg N ha −1 , and 9000 for 202 kg N ha −1”
t0“Rice Cultivars”
Claim · model-written summary
At 134 kg N ha−1 rough rice yield was 8520.
- Taxon
- RiceOryza sativat0
- Treatment
- 134 kg N ha −1e0
- Outcome
- Rough rice yieldse0
- Direction
- higherinferrede0
- Value
- 8520e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rough rice yields were 7564 for 67 kg N ha −1 , 8520 for 134 kg N ha −1 , and 9000 for 202 kg N ha −1”
t0“Rice Cultivars”
Claim · model-written summary
At 202 kg N ha−1 rough rice yield was 9000.
- Taxon
- RiceOryza sativat0
- Treatment
- 202 kg N ha −1e0
- Outcome
- Rough rice yieldse0
- Direction
- higherinferrede0
- Value
- 9000e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rough rice yields were 7564 for 67 kg N ha −1 , 8520 for 134 kg N ha −1 , and 9000 for 202 kg N ha −1”
t0“Rice Cultivars”
Claim · model-written summary
Cheniere head rice yield was independent of nitrogen rate.
- Taxon
- RiceOryza sativat0
- Material
- Chenieree0
- Treatment
- N ratee0
- Outcome
- head rice yielde0
- Direction
- independente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“head rice yield of Cheniere was independent of N rate”
t0“Rice Cultivars”
Claim · model-written summary
Wells head rice yield rose as nitrogen increased from 67 to 202 kg ha−1.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“head rice yield of Wells increased when the N rate was increased from 67 to 202 kg ha −1”
t0“Rice Cultivars”
Claim · model-written summary
Panicle density responded to nitrogen similarly to rough rice yield.
- Taxon
- RiceOryza sativat0
- Treatment
- N ratee0
- Outcome
- Panicle densitye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Panicle density responded to N rate similar to rough rice yield”
t0“Rice Cultivars”
Claim · model-written summary
Panicle density increased to 418 panicles m−2 at 646 seeds m−2.
- Taxon
- RiceOryza sativat0
- Treatment
- 646 seeds m −2e0
- Outcome
- Panicle densitye0
- Direction
- increasede0
- Value
- 418 panicles m −2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Panicle density increased with seeding rate up to 418 panicles m −2 at a seeding rate of 646 seeds m −2”
t0“Rice Cultivars”
Claim · model-written summary
Filled grains per panicle were highest at 162 seeds m−2.
- Taxon
- RiceOryza sativat0
- Treatment
- 162 seeds m −2e0
- Outcome
- Filled grain panicle −1e0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Filled grain panicle −1 was highest at a seeding rate of 162 seeds m −2”
t0“Rice Cultivars”
Claim · model-written summary
Cheniere had more filled grains per panicle than Wells.
- Taxon
- RiceOryza sativat0
- Material
- Chenieree0
- Outcome
- filled grain panicle −1e0
- Direction
- moree0
- Comparator
- Wellse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cheniere produced more filled grain panicle −1 while Wells had a higher 1000‐grain weight”
t0“Rice Cultivars”
Claim · model-written summary
Wells had higher thousand-grain weight than Cheniere.
- Taxon
- RiceOryza sativat0
- Material
- Wellse0
- Outcome
- 1000‐grain weighte0
- Direction
- highere0
- Comparator
- Chenieree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cheniere produced more filled grain panicle −1 while Wells had a higher 1000‐grain weight”
t0“Rice Cultivars”
The same questions in other papers
nitrogen · yield · Oryza sativa (rice)Positive and negative results
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