Abstract
Abstract Seeding rate is an important factor in optimizing yield components and thus grain yield of conventional rice ( Oryza sativa L.), yet limited information on its effect on organic rice production is available. A field study was conducted under organic management over 2 yr to comprehensively evaluate the effects of seeding rate (108, 161, 215, 269, 323, 376, and 431 seeds m −2 ) and rice cultivar (Presidio [inbred] and XP753 [hybrid]) on yield components, grain yield, milling quality, weed density, and economic returns. Seeding rate had significant effects on seedling stand density and dry biomass with positive linear correlations. Yield linearly increased with increasing seeding rate with the greatest yields of 3,462 kg ha −1 for Presidio and 7,508 kg ha −1 for XP753 at the highest seeding rate tested. Panicle number was positively correlated with seeding rate, while milling quality was not affected by seeding rate. The linear‐plateau (LP) model fit best for Presidio and the quadratic‐plateau (QP) model fit best for XP753 to estimate the ex ante economic optimum seeding rate (EOSR). The EOSR was 87 kg ha −1 (340 seeds m −2 ) for Presidio and 48 kg ha −1 (192 seeds m −2 ) for XP753. Using the EOSR, producers could expect a yield of 3053 kg ha −1 and an economic return of US$1,288−$1,346 ha −1 for Presidio, and a yield of 5,835−6,092 kg ha −1 and an economic return of $1,986−$2,686 ha −1 for XP753.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 14
Claim · model-written summary
Seedling stand density increased linearly with seeding rate.
- Taxon
- rice
Oryza sativat0 - Treatment
- Seeding ratee0
- Outcome
- seedling stand densitye0
- Direction
- positive linear correlationse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeding rate had significant effects on seedling stand density and dry biomass with positive linear correlations.”
t0“organic rice”
Claim · model-written summary
Dry biomass increased linearly with seeding rate.
- Taxon
- riceOryza sativat0
- Treatment
- Seeding ratee0
- Outcome
- dry biomasse0
- Direction
- positive linear correlationse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeding rate had significant effects on seedling stand density and dry biomass with positive linear correlations.”
t0“organic rice”
Claim · model-written summary
Presidio yield increased with seeding rate, reaching 3,462 kg ha −1 at the highest rate.
- Taxon
- riceOryza sativat0
- Material
- Presidioe0
- Treatment
- increasing seeding ratee0
- Outcome
- Yielde0
- Direction
- increasede0
- Value
- 3,462 kg ha −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield linearly increased with increasing seeding rate with the greatest yields of 3,462 kg ha −1 for Presidio and 7,508 kg ha −1 for XP753 at the highest seeding rate tested.”
t0“organic rice”
Claim · model-written summary
XP753 yield increased with seeding rate, reaching 7,508 kg ha −1 at the highest rate.
- Taxon
- riceOryza sativat0
- Material
- XP753e0
- Treatment
- increasing seeding ratee0
- Outcome
- Yielde0
- Direction
- increasede0
- Value
- 7,508 kg ha −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield linearly increased with increasing seeding rate with the greatest yields of 3,462 kg ha −1 for Presidio and 7,508 kg ha −1 for XP753 at the highest seeding rate tested.”
t0“organic rice”
Claim · model-written summary
Panicle number was positively correlated with seeding rate.
- Taxon
- riceOryza sativat0
- Treatment
- seeding ratee0
- Outcome
- Panicle numbere0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Panicle number was positively correlated with seeding rate, while milling quality was not affected by seeding rate.”
t0“organic rice”
Claim · model-written summary
Milling quality was not affected by seeding rate.
- Taxon
- riceOryza sativat0
- Treatment
- seeding ratee0
- Outcome
- milling qualitye0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Panicle number was positively correlated with seeding rate, while milling quality was not affected by seeding rate.”
t0“organic rice”
Claim · model-written summary
The linear plateau model best fit Presidio economic optimum seeding rate estimation.
- Taxon
- riceOryza sativat0
- Material
- Presidioe0
- Outcome
- model fite0
- Comparator
- quadratic‐plateau (QP) modele0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The linear‐plateau (LP) model fit best for Presidio and the quadratic‐plateau (QP) model fit best for XP753 to estimate the ex ante economic optimum seeding rate (EOSR).”
t0“organic rice”
Claim · model-written summary
The quadratic plateau model best fit XP753 economic optimum seeding rate estimation.
- Taxon
- riceOryza sativat0
- Material
- XP753e0
- Outcome
- model fite0
- Comparator
- linear‐plateau (LP) modele0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The linear‐plateau (LP) model fit best for Presidio and the quadratic‐plateau (QP) model fit best for XP753 to estimate the ex ante economic optimum seeding rate (EOSR).”
t0“organic rice”
Claim · model-written summary
The estimated economic optimum seeding rate for Presidio was 87 kg ha −1.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The EOSR was 87 kg ha −1 (340 seeds m −2 ) for Presidio and 48 kg ha −1 (192 seeds m −2 ) for XP753.”
t0“organic rice”
Claim · model-written summary
The estimated economic optimum seeding rate for XP753 was 48 kg ha −1.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The EOSR was 87 kg ha −1 (340 seeds m −2 ) for Presidio and 48 kg ha −1 (192 seeds m −2 ) for XP753.”
t0“organic rice”
Claim · model-written summary
At the economic optimum seeding rate, expected Presidio yield was 3053 kg ha −1.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Using the EOSR, producers could expect a yield of 3053 kg ha −1 and an economic return of US$1,288−$1,346 ha −1 for Presidio, and a yield of 5,835−6,092 kg ha −1 and an economic return of $1,986−$2,686 ha −1 for XP753.”
t0“organic rice”
Claim · model-written summary
At the economic optimum seeding rate, expected Presidio economic return was US$1,288−$1,346 ha −1.
- Taxon
- riceOryza sativat0
- Material
- Presidioe0
- Treatment
- EOSRe0
- Outcome
- economic returne0
- Value
- US$1,288−$1,346 ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Using the EOSR, producers could expect a yield of 3053 kg ha −1 and an economic return of US$1,288−$1,346 ha −1 for Presidio, and a yield of 5,835−6,092 kg ha −1 and an economic return of $1,986−$2,686 ha −1 for XP753.”
t0“organic rice”
Claim · model-written summary
At the economic optimum seeding rate, expected XP753 yield was 5,835−6,092 kg ha −1.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Using the EOSR, producers could expect a yield of 3053 kg ha −1 and an economic return of US$1,288−$1,346 ha −1 for Presidio, and a yield of 5,835−6,092 kg ha −1 and an economic return of $1,986−$2,686 ha −1 for XP753.”
t0“organic rice”
Claim · model-written summary
At the economic optimum seeding rate, expected XP753 economic return was $1,986−$2,686 ha −1.
- Taxon
- riceOryza sativat0
- Material
- XP753e0
- Treatment
- EOSRe0
- Outcome
- economic returne0
- Value
- $1,986−$2,686 ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Using the EOSR, producers could expect a yield of 3053 kg ha −1 and an economic return of US$1,288−$1,346 ha −1 for Presidio, and a yield of 5,835−6,092 kg ha −1 and an economic return of $1,986−$2,686 ha −1 for XP753.”
t0“organic rice”
The same questions in other papers
density · quality: grain · Oryza sativa (rice)Positive and negative results
8 papers in the same direction as this paper · 5 in the opposite direction
- positive
- positive
- positive
10 papers more in this group
See all 14 papers →density · growth · Oryza sativa (rice)Positive and negative results
72 papers in the same direction as this paper · 23 in the opposite direction
- no effect
- no effect
- negative
92 papers more in this group
See all 96 papers →density · yield · Oryza sativa (rice)Positive and negative results
329 papers in the same direction as this paper · 58 in the opposite direction · 7 reporting no difference from an alternative
- positive
- positive
- positive
391 papers more in this group
See all 395 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.