Abstract
SUMMARY The effects of three levels of nitrogen (0, 2 and 4 g (NH 4 ) 2 SO 4 per pot) were evaluated in four rice varieties, differing in grain size, under flooded conditions in a tropical environment. Addition of nitrogen increased plant height and leaf number on the main culm, and hastened flowering significantly in all varieties. It also increased the dry weights of leaf, and culm plus sheath at the maximum tillering stage, anthesis and harvest. The average dry weights of both leaf, and culm plus sheath increased significantly in all varieties until anthesis. Following anthesis, the dry weights of both leaf, and culm plus sheath of the large‐seeded varieties, Zhu Lian and PP 6 R, further increased mainly due to emergence of the late tillers, but decreased in the small‐seeded varieties, IR 747 and P 3 C 26 . During grain‐filling, vars Zhu Lian and PP 6 R accumulated dry matter more than the other two varieties and did not use their reserve starch present in the culm plus sheath, presumably because of the lack of demand. By contrast, current photosynthesis and ‘reserve’ contributed about 70% and 30%, respectively, of the grain yield in IR 747 and P 3 C 26 . Addition of nitrogen increased grain yield significantly in all varieties. The yield increase in IR 747 and PP 6 R was essentially due to increase in grain number, but that in P 3 C 26 and Zhu Lian was due to increases in both grain size and grain number, the latter having much greater influence. Neither the percentage of filled spikelets nor the 1000‐grain weight was influenced by nitrogen addition. It was concluded that grain number is the single most important yield component in rice. Path‐coefficient analysis indicated that in a breeding programme involving these four rice varieties, the cross between Zhu Lian and P 3 C 26 would be most successful in an effort to combine high spikelet number and large grain size.
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 16
Claim · model-written summary
Nitrogen addition increased plant height and leaf number on the main culm of rice.
- Taxon
- rice
Oryza sativat0 - Treatment
- Addition of nitrogene1
- Outcome
- plant height and leaf number on the main culme1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield components of rice”
e1“Addition of nitrogen increased plant height and leaf number on the main culm, and hastened flowering significantly in all varieties”
Claim · model-written summary
Nitrogen addition hastened flowering of rice in all varieties.
- Taxon
- riceOryza sativat0
- Treatment
- Addition of nitrogene1
- Outcome
- floweringe1
- Direction
- hastenede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield components of rice”
e1“Addition of nitrogen increased plant height and leaf number on the main culm, and hastened flowering significantly in all varieties”
Claim · model-written summary
Nitrogen addition increased dry weights of leaf and culm plus sheath at maximum tillering, anthesis and harvest.
- Taxon
- riceOryza sativat0
- Organ / stage
- maximum tillering stage, anthesis and harveste2
- Treatment
- Addition of nitrogene1
- Outcome
- dry weights of leaf, and culm plus sheathe2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield components of rice”
e2“It also increased the dry weights of leaf, and culm plus sheath at the maximum tillering stage, anthesis and harvest”
e1“Addition of nitrogen increased plant height and leaf number on the main culm, and hastened flowering significantly in all varieties”
Claim · model-written summary
Nitrogen addition increased leaf and culm plus sheath dry weights until anthesis in all varieties.
- Taxon
- riceOryza sativat0
- Treatment
- Addition of nitrogene1
- Outcome
- dry weights of both leaf, and culm plus sheathe3
- Direction
- increasede3
- Qualifier
- until anthesise3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield components of rice”
e3“The average dry weights of both leaf, and culm plus sheath increased significantly in all varieties until anthesis”
e1“Addition of nitrogen increased plant height and leaf number on the main culm, and hastened flowering significantly in all varieties”
Claim · model-written summary
After anthesis, leaf and culm plus sheath dry weights further increased in Zhu Lian and PP 6 R.
- Taxon
- riceOryza sativat0
- Material
- Zhu Lian and PP 6 Re4
- Organ / stage
- Following anthesise4
- Outcome
- dry weights of both leaf, and culm plus sheathe4
- Direction
- further increasede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield components of rice”
e4“Following anthesis, the dry weights of both leaf, and culm plus sheath of the large‐seeded varieties, Zhu Lian and PP 6 R, further increased mainly due to emergence of the late tillers, but decreased in the small‐seeded varieties, IR 747 and P 3 C 26”
Claim · model-written summary
After anthesis, leaf and culm plus sheath dry weights decreased in IR 747 and P 3 C 26.
- Taxon
- riceOryza sativat0
- Material
- IR 747 and P 3 C 26e4
- Organ / stage
- Following anthesise4
- Outcome
- dry weights of both leaf, and culm plus sheathe4
- Direction
- decreasede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield components of rice”
e4“Following anthesis, the dry weights of both leaf, and culm plus sheath of the large‐seeded varieties, Zhu Lian and PP 6 R, further increased mainly due to emergence of the late tillers, but decreased in the small‐seeded varieties, IR 747 and P 3 C 26”
Claim · model-written summary
Zhu Lian and PP 6 R accumulated more dry matter than the other two varieties during grain-filling.
- Taxon
- riceOryza sativat0
- Material
- Zhu Lian and PP 6 Re5
- Organ / stage
- During grain‐fillinge5
- Outcome
- dry mattere5
- Direction
- moree5
- Comparator
- the other two varietiese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield components of rice”
e5“During grain‐filling, vars Zhu Lian and PP 6 R accumulated dry matter more than the other two varieties and did not use their reserve starch present in the culm plus sheath, presumably because of the lack of demand”
Claim · model-written summary
Zhu Lian and PP 6 R did not use their culm plus sheath reserve starch during grain-filling.
- Taxon
- riceOryza sativat0
- Material
- Zhu Lian and PP 6 Re5
- Outcome
- reserve starche5
- Direction
- did not usee5
- Qualifier
- presumably because of the lack of demande5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield components of rice”
e5“During grain‐filling, vars Zhu Lian and PP 6 R accumulated dry matter more than the other two varieties and did not use their reserve starch present in the culm plus sheath, presumably because of the lack of demand”
Claim · model-written summary
Current photosynthesis contributed about 70% of grain yield in IR 747 and P 3 C 26.
- Taxon
- riceOryza sativat0
- Material
- IR 747 and P 3 C 26e6
- Outcome
- grain yielde6
- Value
- about 70%e6
- Qualifier
- current photosynthesise6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield components of rice”
e6“By contrast, current photosynthesis and ‘reserve’ contributed about 70% and 30%, respectively, of the grain yield in IR 747 and P 3 C 26”
Claim · model-written summary
Reserve contributed about 30% of grain yield in IR 747 and P 3 C 26.
- Taxon
- riceOryza sativat0
- Material
- IR 747 and P 3 C 26e6
- Outcome
- grain yielde6
- Value
- 30%e6
- Qualifier
- reservee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield components of rice”
e6“By contrast, current photosynthesis and ‘reserve’ contributed about 70% and 30%, respectively, of the grain yield in IR 747 and P 3 C 26”
Claim · model-written summary
Nitrogen addition increased grain yield in all varieties.
- Taxon
- riceOryza sativat0
- Treatment
- Addition of nitrogene7
- Outcome
- grain yielde7
- Direction
- increasede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield components of rice”
e7“Addition of nitrogen increased grain yield significantly in all varieties”
Claim · model-written summary
The yield increase in IR 747 and PP 6 R was due to increased grain number.
- Taxon
- riceOryza sativat0
- Material
- IR 747 and PP 6 Re4
- Outcome
- grain numbere4
- Direction
- increasee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield components of rice”
e4“The yield increase in IR 747 and PP 6 R was essentially due to increase in grain number, but that in P 3 C 26 and Zhu Lian was due to increases in both grain size and grain number, the latter having much greater influence”
Claim · model-written summary
The yield increase in P 3 C 26 and Zhu Lian was due to increases in both grain size and grain number, with grain number contributing more.
- Taxon
- riceOryza sativat0
- Material
- P 3 C 26 and Zhu Liane4
- Outcome
- grain size and grain numbere4
- Direction
- increasese4
- Qualifier
- the latter having much greater influencee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield components of rice”
e4“The yield increase in IR 747 and PP 6 R was essentially due to increase in grain number, but that in P 3 C 26 and Zhu Lian was due to increases in both grain size and grain number, the latter having much greater influence”
Claim · model-written summary
Nitrogen addition did not change the percentage of filled spikelets or the 1000-grain weight.
- Taxon
- riceOryza sativat0
- Treatment
- nitrogen additione5
- Outcome
- percentage of filled spikeletse5
- Qualifier
- nor the 1000‐grain weighte5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield components of rice”
e5“Neither the percentage of filled spikelets nor the 1000‐grain weight was influenced by nitrogen addition”
Claim · model-written summary
Grain number is the single most important yield component in rice.
- Taxon
- riceOryza sativat0
- Outcome
- single most important yield componente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield components of rice”
e1“It was concluded that grain number is the single most important yield component in rice”
Claim · model-written summary
The cross between Zhu Lian and P 3 C 26 would be the most successful in combining high spikelet number and large grain size in a breeding programme.
- Taxon
- riceOryza sativat0
- Outcome
- the cross between Zhu Lian and P 3 C 26e1
- Qualifier
- combine high spikelet number and large grain sizee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield components of rice”
e1“Path‐coefficient analysis indicated that in a breeding programme involving these four rice varieties, the cross between Zhu Lian and P 3 C 26 would be most successful in an effort to combine high spikelet number and large grain size”
The same questions in other papers
nitrogen · phenology · Oryza sativa (rice)Positive and negative results
8 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
6 papers more in this group
See all 10 papers →nitrogen · growth · Oryza sativa (rice)Positive and negative results
401 papers in the same direction as this paper · 101 in the opposite direction · 8 reporting no difference from an alternative
- negative
- negative
- negative
507 papers more in this group
See all 511 papers →nitrogen · yield · Oryza sativa (rice)Positive and negative results
1,802 papers in the same direction as this paper · 193 in the opposite direction · 49 reporting no difference from an alternative
- negative
- negative
- negative
2,041 papers more in this group
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.