Paper · 1968 · Journal of Weed Science and Technology

Studies on the Damage to Rice Plants Due to Weed Competition

Kenji NODA; Keio OZAWA; Kazunori IBARAKI

16
claims
48
verbatim quotes
1
citations
3
research areas
✓
Open access

Abstract

1965・1966の両年において, 移植水稲とタイヌビエとの競争関係におけるタイヌビエの発生本数による水稲収量, 収量構成要素, 並びに2, 3水稲の生態生理的条件への影響を観察した。 結果の要旨は以下のごとくである。1. 草丈にたいする影響はほとんどないが, とくにタイヌビエの発生の多い区では, 生育中期に伸長促進的傾向がみられる。 他方, 茎数への影響は顕著であり, とくに生育中期からの水稲茎数の減少が目立つている。 これが最終の穂数に影響してくる。2. 水稲収量への影響は, ヒエの発生の多いほど著しく, 収量指数と発生本数との関係は, 発生本数の増加にともなつて, 収量減少速度の漸増する曲線として示される。 これは多肥>少肥, 栽植密度では疎>中>密の傾向である。3. 水稲収量とヒエの全生産重量との関係は, logY=a-bX式 (Y: 収量指数, X: ヒエの重量, a・bは常数) として表現され, 実験式は肥料, 水稲の栽植密度を捨象して算出される。 しかし, 年次による差は除くことが出来なかつた。4. ヒエとの競争による水稲収量の減少に関与する収量構成要素の関与率は, 大きいものからあげると, 穂数・稔実粒重・一穂小穂数・稔実率の順である。5. 水稲・ヒエの混合群落において, 水稲の生理生態的条件の変化としては, 生産構造の量的低下, LAIの減少, 同化, 非同化部分の量的発達の低下, 生育中期の葉片部のN含量の低下などがみられた。6. チッソの吸収過程は水稲とタイヌビエでは異なつており, 水稲は早く最高値に達するのに反して, ヒエでは後まで吸収しつづける。 従つてチッソ吸収についての両植物の競争関係は生育前半期までが大きいと考察された。

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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

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Barnyard grass density had almost no effect on rice plant height.

Taxon
水稲e0
Treatment
タイヌビエの発生本数e0
Interactor
タイヌビエe0weed
Outcome
草丈e1
Direction
no_changeinferrede1

Not reportedComparator

Verbatim

t0

“Rice Plants”

✓ located verbatim in the source · title, characters 25–36 · show in text ↑
e0

“タイヌビエの発生本数による水稲収量”

✓ located verbatim in the source · abstract, characters 38–55 · show in text ↑
e1

“草丈にたいする影響はほとんどない”

✓ located verbatim in the source · abstract, characters 112–128 · show in text ↑
Intervention effectobservedoriginal resultmeasured

Claim · model-written summary

In plots with many barnyard grass plants, rice elongation tended to be promoted in the middle growth stage.

Taxon
水稲e0
Treatment
タイヌビエの発生本数e0
Interactor
タイヌビエe0weed
Outcome
伸長e1
Direction
促進的傾向e1

Not reportedComparator

Verbatim

t0

“Rice Plants”

✓ located verbatim in the source · title, characters 25–36 · show in text ↑
e0

“タイヌビエの発生本数による水稲収量”

✓ located verbatim in the source · abstract, characters 38–55 · show in text ↑
e1

“とくにタイヌビエの発生の多い区では, 生育中期に伸長促進的傾向がみられる”

✓ located verbatim in the source · abstract, characters 131–167 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Barnyard grass markedly affected rice tiller number, with a conspicuous decrease from the middle growth stage.

Taxon
水稲e0
Treatment
タイヌビエの発生本数e0
Interactor
タイヌビエe0weed
Outcome
水稲茎数e1
Direction
減少e1

Not reportedComparator

Verbatim

t0

“Rice Plants”

✓ located verbatim in the source · title, characters 25–36 · show in text ↑
e0

“タイヌビエの発生本数による水稲収量”

✓ located verbatim in the source · abstract, characters 38–55 · show in text ↑
e1

“茎数への影響は顕著であり, とくに生育中期からの水稲茎数の減少が目立つている”

✓ located verbatim in the source · abstract, characters 173–211 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

The tiller reduction affected final panicle number.

Taxon
水稲e0
Treatment
タイヌビエの発生本数e0
Interactor
タイヌビエe0weed
Outcome
穂数e1

Not reportedComparatorDirection

Verbatim

t0

“Rice Plants”

✓ located verbatim in the source · title, characters 25–36 · show in text ↑
e0

“タイヌビエの発生本数による水稲収量”

✓ located verbatim in the source · abstract, characters 38–55 · show in text ↑
e1

“これが最終の穂数に影響してくる”

✓ located verbatim in the source · abstract, characters 213–228 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

The effect on rice yield became more marked as barnyard grass density increased.

Taxon
水稲e0
Treatment
タイヌビエの発生本数e0
Interactor
タイヌビエe0weed
Outcome
水稲収量e1

Not reportedComparatorDirection

Verbatim

t0

“Rice Plants”

✓ located verbatim in the source · title, characters 25–36 · show in text ↑
e0

“タイヌビエの発生本数による水稲収量”

✓ located verbatim in the source · abstract, characters 38–55 · show in text ↑
e1

“水稲収量への影響は, ヒエの発生の多いほど著しく”

✓ located verbatim in the source · abstract, characters 232–256 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

The relation of yield index to weed density was a curve in which the rate of yield decrease rose progressively with density.

Taxon
水稲e0
Treatment
タイヌビエの発生本数e0
Interactor
タイヌビエe0weed
Outcome
収量減少速度e1
Direction
漸増e1

Not reportedComparator

Verbatim

t0

“Rice Plants”

✓ located verbatim in the source · title, characters 25–36 · show in text ↑
e0

“タイヌビエの発生本数による水稲収量”

✓ located verbatim in the source · abstract, characters 38–55 · show in text ↑
e1

“収量指数と発生本数との関係は, 発生本数の増加にともなつて, 収量減少速度の漸増する曲線として示される”

✓ located verbatim in the source · abstract, characters 258–309 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

The yield loss was greater under heavy than light fertilisation.

Taxon
水稲e0
Treatment
タイヌビエの発生本数e0
Interactor
タイヌビエe0weed
Outcome
多肥>少肥e1
Direction
多肥>少肥e1

Not reportedComparator

Verbatim

t0

“Rice Plants”

✓ located verbatim in the source · title, characters 25–36 · show in text ↑
e0

“タイヌビエの発生本数による水稲収量”

✓ located verbatim in the source · abstract, characters 38–55 · show in text ↑
e1

“多肥>少肥”

✓ located verbatim in the source · abstract, characters 314–319 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

The yield loss was greater at sparse than medium and dense planting.

Taxon
水稲e0
Treatment
タイヌビエの発生本数e0
Interactor
タイヌビエe0weed
Outcome
疎>中>密e1
Direction
疎>中>密e1

Not reportedComparator

Verbatim

t0

“Rice Plants”

✓ located verbatim in the source · title, characters 25–36 · show in text ↑
e0

“タイヌビエの発生本数による水稲収量”

✓ located verbatim in the source · abstract, characters 38–55 · show in text ↑
e1

“栽植密度では疎>中>密の傾向である”

✓ located verbatim in the source · abstract, characters 321–338 · show in text ↑
Associationobservedoriginal resultmeasured

Claim · model-written summary

Rice yield and total barnyard grass weight were related by logY = a - bX, with Y yield index and X weed weight.

Taxon
水稲e0
Treatment
ヒエの全生産重量e1
Interactor
タイヌビエe0weed
Outcome
水稲収量e1
Value
logY=a-bXe1

Not reportedDirection

Verbatim

t0

“Rice Plants”

✓ located verbatim in the source · title, characters 25–36 · show in text ↑
e0

“タイヌビエの発生本数による水稲収量”

✓ located verbatim in the source · abstract, characters 38–55 · show in text ↑
e1

“水稲収量とヒエの全生産重量との関係は, logY=a-bX式”

✓ located verbatim in the source · abstract, characters 342–372 · show in text ↑
Observationobservedoriginal resultmeasured

Claim · model-written summary

The yield components contributing to yield loss from weed competition ranked panicle number, ripened grain weight, spikelets per panicle, ripening ratio.

Taxon
水稲e0
Interactor
タイヌビエe0weed
Outcome
収量構成要素の関与率e1
Qualifier
穂数・稔実粒重・一穂小穂数・稔実率の順e1

Verbatim

t0

“Rice Plants”

✓ located verbatim in the source · title, characters 25–36 · show in text ↑
e0

“タイヌビエの発生本数による水稲収量”

✓ located verbatim in the source · abstract, characters 38–55 · show in text ↑
e1

“ヒエとの競争による水稲収量の減少に関与する収量構成要素の関与率は, 大きいものからあげると, 穂数・稔実粒重・一穂小穂数・稔実率の順である”

✓ located verbatim in the source · abstract, characters 464–533 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

In mixed rice and barnyard grass stands the production structure declined quantitatively.

Taxon
水稲e0
Treatment
タイヌビエの発生本数e0
Interactor
タイヌビエe0weed
Outcome
生産構造e1
Direction
低下e1

Not reportedComparator

Verbatim

t0

“Rice Plants”

✓ located verbatim in the source · title, characters 25–36 · show in text ↑
e0

“タイヌビエの発生本数による水稲収量”

✓ located verbatim in the source · abstract, characters 38–55 · show in text ↑
e1

“生産構造の量的低下”

✓ located verbatim in the source · abstract, characters 572–581 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

In mixed stands rice LAI decreased.

Taxon
水稲e0
Treatment
タイヌビエの発生本数e0
Interactor
タイヌビエe0weed
Outcome
LAIe1
Direction
減少e1

Not reportedComparator

Verbatim

t0

“Rice Plants”

✓ located verbatim in the source · title, characters 25–36 · show in text ↑
e0

“タイヌビエの発生本数による水稲収量”

✓ located verbatim in the source · abstract, characters 38–55 · show in text ↑
e1

“LAIの減少”

✓ located verbatim in the source · abstract, characters 583–589 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

In mixed stands the quantitative development of assimilating and non-assimilating parts declined.

Taxon
水稲e0
Organ / stage
同化, 非同化部分e1
Treatment
タイヌビエの発生本数e0
Interactor
タイヌビエe0weed
Outcome
量的発達e1
Direction
低下e1

Not reportedComparator

Verbatim

t0

“Rice Plants”

✓ located verbatim in the source · title, characters 25–36 · show in text ↑
e0

“タイヌビエの発生本数による水稲収量”

✓ located verbatim in the source · abstract, characters 38–55 · show in text ↑
e1

“同化, 非同化部分の量的発達の低下”

✓ located verbatim in the source · abstract, characters 591–608 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

In mixed stands the N content of the leaf blades decreased in the middle growth stage.

Taxon
水稲e0
Organ / stage
葉片部e1
Treatment
タイヌビエの発生本数e0
Interactor
タイヌビエe0weed
Outcome
N含量e1
Direction
低下e1

Not reportedComparator

Verbatim

t0

“Rice Plants”

✓ located verbatim in the source · title, characters 25–36 · show in text ↑
e0

“タイヌビエの発生本数による水稲収量”

✓ located verbatim in the source · abstract, characters 38–55 · show in text ↑
e1

“生育中期の葉片部のN含量の低下”

✓ located verbatim in the source · abstract, characters 610–625 · show in text ↑
Observationobservedoriginal resultmeasured

Claim · model-written summary

Rice reached its maximum nitrogen uptake early whereas barnyard grass kept absorbing until later.

Taxon
水稲e0
Interactor
タイヌビエe0weed
Outcome
チッソの吸収過程e1

Verbatim

t0

“Rice Plants”

✓ located verbatim in the source · title, characters 25–36 · show in text ↑
e0

“タイヌビエの発生本数による水稲収量”

✓ located verbatim in the source · abstract, characters 38–55 · show in text ↑
e1

“チッソの吸収過程は水稲とタイヌビエでは異なつており, 水稲は早く最高値に達するのに反して, ヒエでは後まで吸収しつづける”

✓ located verbatim in the source · abstract, characters 636–696 · show in text ↑
Observationauthor interpretationoriginal resultmeasured

Claim · model-written summary

The authors consider competition between the two plants for nitrogen uptake to be large up to the first half of growth.

Taxon
水稲e0
Interactor
タイヌビエe0weed
Outcome
競争関係e1

Verbatim

t0

“Rice Plants”

✓ located verbatim in the source · title, characters 25–36 · show in text ↑
e0

“タイヌビエの発生本数による水稲収量”

✓ located verbatim in the source · abstract, characters 38–55 · show in text ↑
e1

“チッソ吸収についての両植物の競争関係は生育前半期までが大きいと考察された”

✓ located verbatim in the source · abstract, characters 701–737 · show in text ↑