Abstract
Objective guidelines about plant population are essential to ensure that yield potential of rice grain is not compromised. Drill-sowing of rice is increasing in popularity in many rice-growing regions of the world in response to a requirement for increased water productivity, but little information is available on row-spacing widths required to maximise grain yield potential. This research investigated the impacts of plant population on grain yield and yield components for aerial- and drill-sown rice, and the effects of row-spacing width for drill-sown rice grown in a temperate environment. Ten aerial-sown and five drill-sown experiments were conducted in south-eastern Australia over three seasons using four semi-dwarf rice varieties. Plant populations ranged from 7 to 396 plants m–2. Plant populations as low as 30 plants m–2 were able to achieve grain yields >12 t ha–1 but only when the plants were uniformly distributed. At a population of ~100 plants m–2, the impact of plant-stand distribution was negligible. Grain yield was maintained across a large range of plant populations, mainly through compensatory effects of more tillers per plant and more grains per panicle at lower plant populations. For aerial-sown rice, maximum grain yield (up to 14.9 t ha–1) was always achieved with a minimum plant population of 100 plants m–2, and likewise for drill-sown rice provided the row spacing was ≤27 cm. At equivalent plant populations, 36-cm row spacing produced lower grain yield than narrower row spacings. When large gaps existed between plants within the rows, neighbouring plants could not compensate for the gap at the wider 36-cm row spacing, and grain yield was reduced. A practical optimal plant population of 100–200 plants m–2 was found to be suitable for the semi-dwarf varieties used in this study for both aerial- and drill-sowing methods.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by-nc-nd. 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 10
Claim · model-written summary
Uniform stands at 30 plants m–2 achieved grain yield above 12 t ha–1.
- Taxon
- rice
Oryza sativat0 - Outcome
- grain yieldse0
- Value
- >12 t ha–1e0
- Qualifier
- 30 plants m–2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Plant populations as low as 30 plants m–2 were able to achieve grain yields >12 t ha–1 but only when the plants were uniformly distributed.”
Claim · model-written summary
At about 100 plants m–2, stand distribution had negligible impact.
- Taxon
- riceOryza sativat0
- Outcome
- impact of plant-stand distributione1
- Direction
- negligiblee1
- Comparator
- ~100 plants m–2e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e1“At a population of ~100 plants m–2, the impact of plant-stand distribution was negligible.”
Claim · model-written summary
Grain yield was maintained or increased at lower plant populations.
- Taxon
- riceOryza sativat0
- Outcome
- Grain yielde2
- Direction
- maintainede2
- Comparator
- lower plant populationse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e2“Grain yield was maintained across a large range of plant populations, mainly through compensatory effects of more tillers per plant and more grains per panicle at lower plant populations.”
Claim · model-written summary
more tillers per plant was maintained or increased at lower plant populations.
- Taxon
- riceOryza sativat0
- Outcome
- more tillers per plante2
- Direction
- moree2
- Comparator
- lower plant populationse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e2“Grain yield was maintained across a large range of plant populations, mainly through compensatory effects of more tillers per plant and more grains per panicle at lower plant populations.”
Claim · model-written summary
more grains per panicle was maintained or increased at lower plant populations.
- Taxon
- riceOryza sativat0
- Outcome
- more grains per paniclee2
- Direction
- moree2
- Comparator
- lower plant populationse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e2“Grain yield was maintained across a large range of plant populations, mainly through compensatory effects of more tillers per plant and more grains per panicle at lower plant populations.”
Claim · model-written summary
Aerial-sown rice reached maximum grain yield up to 14.9 t ha–1 with at least 100 plants m–2.
- Taxon
- riceOryza sativat0
- Outcome
- maximum grain yielde3
- Value
- 14.9 t ha–1e3
- Qualifier
- minimum plant population of 100 plants m–2e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e3“For aerial-sown rice, maximum grain yield (up to 14.9 t ha–1) was always achieved with a minimum plant population of 100 plants m–2, and likewise for drill-sown rice provided the row spacing was ≤27 cm.”
Claim · model-written summary
Drill-sown rice reached maximum yield with at least 100 plants m–2 and row spacing no greater than 27 cm.
- Taxon
- riceOryza sativat0
- Outcome
- maximum grain yielde3
- Qualifier
- row spacing was ≤27 cme3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e3“For aerial-sown rice, maximum grain yield (up to 14.9 t ha–1) was always achieved with a minimum plant population of 100 plants m–2, and likewise for drill-sown rice provided the row spacing was ≤27 cm.”
Claim · model-written summary
At equivalent populations, 36-cm spacing lowered yield against narrower spacing.
- Taxon
- riceOryza sativat0
- Treatment
- 36-cm row spacinge4
- Outcome
- grain yielde4
- Direction
- lowere4
- Comparator
- narrower row spacingse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e4“At equivalent plant populations, 36-cm row spacing produced lower grain yield than narrower row spacings.”
Claim · model-written summary
Large within-row gaps at 36-cm spacing reduced grain yield.
- Taxon
- riceOryza sativat0
- Outcome
- grain yielde5
- Direction
- reducede5
- Setting
- 36-cm row spacinge5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e5“When large gaps existed between plants within the rows, neighbouring plants could not compensate for the gap at the wider 36-cm row spacing, and grain yield was reduced.”
Claim · model-written summary
The authors identify 100–200 plants m–2 as a practical optimum for semi-dwarf rice with either sowing method.
- Taxon
- riceOryza sativat0
- Outcome
- practical optimal plant population of 100–200 plants m–2e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e6“A practical optimal plant population of 100–200 plants m–2 was found to be suitable for the semi-dwarf varieties used in this study for both aerial- and drill-sowing methods.”
The same questions in other papers
density · yield · Oryza sativa (rice)Positive and negative results
64 papers in the same direction as this paper · 330 in the opposite direction
- 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.