Abstract
Abstract Understanding relationships among rice ( Oryza sativa L.) yield and yield components (panicle density, filled grain per panicle, unfilled grain per panicle, and grain weight) is critical to utilizing these relationships effectively. Interrelationships among rice yield and yield components for direct‐seeded rice cultural systems using path‐coefficient analysis that describes a priori cause‐and‐effect relationships have not been shown. Our objective was to study direct‐seeded rice yield and yield component relationships as affected by seeding rates using path‐coefficient analysis. ‘Lemont’, a semidwarf rice, was seeded at 43, 85, 128, 170, and 213 kg ha −1 in four environments between 1986 and 1988. The seeding rate by environment interaction was nonsignificant for all traits, indicating stable performance across environments. As seeding rates increased, panicle density increased significantly, and filled grain per panicle decreased significantly, an indication of the compensatory nature between these two traits. Higher panicle densities at the lower seeding rates were due in part to increased tillering of the rice plants. Path‐coefficient analysis revealed that panicle density had the largest positive direct effect on rice yield, even at low seeding rates where filled grain per panicle increased to compensate for decreased panicle density. Direct effects for filled grain per panicle and grain weight were of secondary and/or tertiary importance in determining rice yield. Unfilled grain per panicle had negligible effects on rice yield. To achieve optimum rice yields and grain quality in a direct‐seeded cultural system, adequate panicle density per unit area of uniform maturity must be achieved.
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Claims 8
Claim · model-written summary
Seeding rate by environment interaction was nonsignificant for all traits.
- Taxon
- rice
Oryza sativat0 - Outcome
- seeding rate by environment interactione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The seeding rate by environment interaction was nonsignificant for all traits”
t0“Rice”
Claim · model-written summary
Panicle density increased significantly as seeding rates rose.
- Taxon
- riceOryza sativat0
- Treatment
- seeding ratese0
- Outcome
- panicle densitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As seeding rates increased, panicle density increased significantly, and filled grain per panicle decreased significantly”
t0“Rice”
Claim · model-written summary
Filled grain per panicle decreased significantly as seeding rates rose.
- Taxon
- riceOryza sativat0
- Treatment
- seeding ratese0
- Outcome
- filled grain per paniclee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As seeding rates increased, panicle density increased significantly, and filled grain per panicle decreased significantly”
t0“Rice”
Claim · model-written summary
Increased tillering partly explained higher panicle densities at lower seeding rates.
- Taxon
- riceOryza sativae0
- Treatment
- lower seeding ratese0
- Outcome
- panicle densitiese0
- Direction
- Highere0
- Qualifier
- increased tilleringe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher panicle densities at the lower seeding rates were due in part to increased tillering of the rice plants”
Claim · model-written summary
Panicle density had the largest positive direct effect on rice yield.
- Taxon
- riceOryza sativae0
- Organ / stage
- paniclee0
- Outcome
- rice yielde0
- Direction
- positivee0
- Qualifier
- largeste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Path‐coefficient analysis revealed that panicle density had the largest positive direct effect on rice yield”
Claim · model-written summary
Filled grain per panicle and grain weight had secondary or tertiary direct effects on rice yield.
- Taxon
- riceOryza sativat0
- Organ / stage
- filled grain per panicle and grain weighte0
- Outcome
- rice yielde1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Direct effects for filled grain per panicle and grain weight were of secondary and/or tertiary importance in determining rice yield”
t0“Rice”
e1“in determining rice yield”
Claim · model-written summary
Unfilled grain per panicle had negligible effects on rice yield.
- Taxon
- riceOryza sativae0
- Organ / stage
- Unfilled grain per paniclee0
- Outcome
- rice yielde0
- Direction
- negligiblee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Unfilled grain per panicle had negligible effects on rice yield”
Claim · model-written summary
The authors recommend adequate panicle density with uniform maturity for optimal yield and grain quality.
- Taxon
- riceOryza sativae0
- Outcome
- adequate panicle density per unit area of uniform maturitye0
- Qualifier
- direct‐seeded cultural systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“To achieve optimum rice yields and grain quality in a direct‐seeded cultural system, adequate panicle density per unit area of uniform maturity must be achieved”
The same questions in other 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
- no effect
- no effect
- negative
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.