Abstract
A field experiment was carried out at the experimental area of Punjab Agricultural University, Ludhiana during 1998 and 1999 to study the competitive behaviour of transplanted rice with variable plant densities (22, 33 and 44 hills m−2) receiving different nitrogen levels (120, 150 and 180 kg ha−1) having the infestation of Echinochloa crusgalli. The field under the experiment was sandy loam in texture with 72.7% sand, 11.1% silt and 16.0% clay and was under continuous rice-wheat rotation since last eight years. During 1998, seed yield of rice increased significantly with each increment in N level, however, during 1999 application of 180 kg N ha−1 significantly increased seed yield of rice than 120 and 150 kg N ha−1 and the differences in the latter treatments were found to be non-significant. Similarly, seed yield of rice increased significantly with increase in plant population from 25 to 41 plants (hills) per sq. m during both the years. Higher plant density increased seed yield by 17.7 and 19.0% than the recommended (33 plants m−2) and 48.1 and 62.5 than 3/4th of recommended (25 plants m−2)during 1998 and 1999, respectively. Higher dose of nitrogen (180 kg ha−1) and higher plant density of 41 plants m−2 resulted in significant reduction in dry matter accumulation by weeds as compared to recommended N (120 kg ha−1) and plant density of 33 plants m−2 during both the years.
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 10
Claim · model-written summary
Rice seed yield rose significantly with each nitrogen increment in 1998.
- Taxon
- rice
Oryza sativae0 - Treatment
- each increment in N levele0
- Outcome
- seed yield of ricee0
- Direction
- increasede0
- Setting
- 1998e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During 1998, seed yield of rice increased significantly with each increment in N level”
Claim · model-written summary
In 1999, 180 kg N ha−1 significantly increased rice seed yield against 120 and 150 kg N ha−1.
- Taxon
- riceOryza sativae0
- Treatment
- 180 kg N ha−1e0
- Outcome
- seed yield of ricee0
- Direction
- increasede0
- Comparator
- 120 and 150 kg N ha−1e0
- Setting
- 1999e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“during 1999 application of 180 kg N ha−1 significantly increased seed yield of rice than 120 and 150 kg N ha−1”
Claim · model-written summary
The 120 and 150 kg N ha−1 treatments did not differ significantly in 1999 rice seed yield.
- Taxon
- RiceOryza sativat0
- Outcome
- differences in the latter treatmentse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the differences in the latter treatments were found to be non-significant”
t0“Rice”
Claim · model-written summary
Rice seed yield increased significantly as density increased from 25 to 41 hills per square metre in both years.
- Taxon
- riceOryza sativae0
- Treatment
- 41 plants (hills) per sq. me0
- Outcome
- seed yield of ricee0
- Direction
- increasede0
- Comparator
- 25e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed yield of rice increased significantly with increase in plant population from 25 to 41 plants (hills) per sq. m during both the years”
Claim · model-written summary
Higher density increased rice seed yield by 17.7% against recommended density in 1998.
- Taxon
- RiceOryza sativat0
- Treatment
- Higher plant densitye0
- Outcome
- seed yielde0
- Direction
- increasede0
- Value
- 17.7e0
- Comparator
- recommended (33 plants m−2)e0
- Setting
- 1998e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher plant density increased seed yield by 17.7 and 19.0% than the recommended (33 plants m−2) and 48.1 and 62.5 than 3/4th of recommended (25 plants m−2)during 1998 and 1999, respectively”
t0“Rice”
Claim · model-written summary
Higher density increased rice seed yield by 19.0% against recommended density in 1999.
- Taxon
- RiceOryza sativat0
- Treatment
- Higher plant densitye0
- Outcome
- seed yielde0
- Direction
- increasede0
- Value
- 19.0%e0
- Comparator
- recommended (33 plants m−2)e0
- Setting
- 1999e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher plant density increased seed yield by 17.7 and 19.0% than the recommended (33 plants m−2) and 48.1 and 62.5 than 3/4th of recommended (25 plants m−2)during 1998 and 1999, respectively”
t0“Rice”
Claim · model-written summary
Higher density increased rice seed yield by 48.1% against 25 plants m−2 in 1998.
- Taxon
- RiceOryza sativat0
- Treatment
- Higher plant densitye0
- Outcome
- seed yielde0
- Direction
- increasede0
- Value
- 48.1e0
- Comparator
- 25 plants m−2e0
- Setting
- 1998e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher plant density increased seed yield by 17.7 and 19.0% than the recommended (33 plants m−2) and 48.1 and 62.5 than 3/4th of recommended (25 plants m−2)during 1998 and 1999, respectively”
t0“Rice”
Claim · model-written summary
Higher density increased rice seed yield by 62.5% against 25 plants m−2 in 1999.
- Taxon
- RiceOryza sativat0
- Treatment
- Higher plant densitye0
- Outcome
- seed yielde0
- Direction
- increasede0
- Value
- 62.5e0
- Comparator
- 25 plants m−2e0
- Setting
- 1999e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher plant density increased seed yield by 17.7 and 19.0% than the recommended (33 plants m−2) and 48.1 and 62.5 than 3/4th of recommended (25 plants m−2)during 1998 and 1999, respectively”
t0“Rice”
Claim · model-written summary
Higher nitrogen significantly reduced weed dry matter relative to recommended nitrogen in both years.
- Taxon
- RiceOryza sativat0
- Treatment
- Higher dose of nitrogen (180 kg ha−1)e0
- Interactor
- weedse0weed
- Outcome
- dry matter accumulation by weedse0
- Direction
- reductione0
- Comparator
- recommended N (120 kg ha−1)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher dose of nitrogen (180 kg ha−1) and higher plant density of 41 plants m−2 resulted in significant reduction in dry matter accumulation by weeds as compared to recommended N (120 kg ha−1) and plant density of 33 plants m−2 during both the years”
t0“Rice”
Claim · model-written summary
Higher rice density significantly reduced weed dry matter relative to recommended density in both years.
- Taxon
- RiceOryza sativat0
- Treatment
- higher plant density of 41 plants m−2e0
- Interactor
- weedse0weed
- Outcome
- dry matter accumulation by weedse0
- Direction
- reductione0
- Comparator
- plant density of 33 plants m−2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher dose of nitrogen (180 kg ha−1) and higher plant density of 41 plants m−2 resulted in significant reduction in dry matter accumulation by weeds as compared to recommended N (120 kg ha−1) and plant density of 33 plants m−2 during both the years”
t0“Rice”
The same questions in other papers
nitrogen · weed · Oryza sativa (rice)Positive and negative results
16 papers in the same direction as this paper · 12 in the opposite direction
- no effect
- negative
- negative
25 papers more in this group
See all 29 papers →density · weed · Oryza sativa (rice)Positive and negative results
40 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
39 papers more in this group
See all 43 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
- no effect
391 papers more in this group
See all 395 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.