Paper · 1986 · The Journal of Agricultural Science

Relative effects of Azolla pinnata and its combination with chemical nitrogen fertilizer on growth, yield and N uptake of rice

D. P. Singh; P. K. Singh

12
claims
12
verbatim quotes
7
citations
2
research areas
—
Not open access

Abstract

SUMMARY Field experiments conducted during wet and dry seasons with Ratna and Jaya varieties of rice ( Oryza sativa Linn.) indicated that the use of Azolla pinnata as fertilizer increased growth in terms of number of tillers, leaf area index, dry-matter production, grain yield, N uptake and its accumulation in different plant parts. Azolla incorporation before planting in addition to 30 kg N/ha produced higher grain yields of both the rice varieties than 60 kg N / h a during the two seasons, while Azolla grown as an intercrop with rice plus 30 kg N/ha was superior to the 60 kg N treatment in grain production of Jaya during the wet season. Azolla incorporation before planting and also once intercropped with rice produced more grain yield than 60 kg N during the wet season. Among Azolla treatments, Azolla twice intercropped with rice produced comparatively lower grain yield. Azolla application increased the number of panicles/m 2 , number of grains/panicle and reduced sterility during both seasons. The N uptake of the rice crop in the treatments of Azolla incorporation before planting or intercropped once with rice in combination with 30 kg N/ha was similar to that of the 60 kg N/ha whereas the treatment of Azolla incorporation before planting plus once intercropped was similar during the wet season only.

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 12

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Azolla fertilizer increased rice tiller number, leaf area index, and dry matter production.

Treatment
Azolla pinnata as fertilizere0
Interactor
Azolla pinnataAzolla pinnatae0symbiont
Outcome
number of tillers, leaf area index, dry-matter productione0
Direction
increasede0

Not reportedTaxonComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Azolla pinnata
Azolla pinnata · InteractorTpa2067 · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“the use of Azolla pinnata as fertilizer increased growth in terms of number of tillers, leaf area index, dry-matter production”

✓ located verbatim in the source · abstract, characters 138–264 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Azolla fertilizer increased rice grain yield.

Treatment
Azolla pinnata as fertilizere0
Outcome
grain yielde0
Direction
increasede0

Not reportedTaxonComparator

Verbatim

e0

“the use of Azolla pinnata as fertilizer increased growth in terms of number of tillers, leaf area index, dry-matter production, grain yield”

✓ located verbatim in the source · abstract, characters 138–277 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Azolla fertilizer increased rice nitrogen uptake and accumulation in plant parts.

Treatment
Azolla pinnata as fertilizere0
Outcome
N uptake and its accumulation in different plant partse0
Direction
increasede0

Not reportedTaxonComparator

Verbatim

e0

“the use of Azolla pinnata as fertilizer increased growth in terms of number of tillers, leaf area index, dry-matter production, grain yield, N uptake and its accumulation in different plant parts.”

✓ located verbatim in the source · abstract, characters 138–334 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Preplant Azolla with 30 kg N/ha produced higher grain yield than 60 kg N/ha for both rice varieties in both seasons.

Treatment
Azolla incorporation before planting in addition to 30 kg N/hae0
Outcome
grain yieldse0
Direction
highere0
Qualifier
during the two seasonse0
Comparator
60 kg N / h ae0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Oryza sativa
Oryza sativa · Taxon · picture from its Wikimedia Commons categoryDesmanthus4food · CC BY-SA 3.0 us · Wikimedia Commons ↗

Verbatim

e0

“Azolla incorporation before planting in addition to 30 kg N/ha produced higher grain yields of both the rice varieties than 60 kg N / h a during the two seasons”

✓ located verbatim in the source · abstract, characters 335–495 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Intercropped Azolla with 30 kg N/ha exceeded 60 kg N for Jaya grain production in the wet season.

Material
Jayae0
Treatment
Azolla grown as an intercrop with rice plus 30 kg N/hae0
Outcome
grain productione0
Direction
superiore0
Comparator
60 kg N treatmente0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Oryza sativa
Oryza sativa · Taxon · picture from its Wikimedia Commons categoryDesmanthus4food · CC BY-SA 3.0 us · Wikimedia Commons ↗

Verbatim

e0

“Azolla grown as an intercrop with rice plus 30 kg N/ha was superior to the 60 kg N treatment in grain production of Jaya during the wet season.”

✓ located verbatim in the source · abstract, characters 503–646 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Preplant Azolla incorporation produced more grain yield than 60 kg N during the wet season.

Treatment
Azolla incorporation before plantinge0
Outcome
grain yielde0
Direction
moree0
Comparator
60 kg Ne0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Oryza sativa
Oryza sativa · Taxon · picture from its Wikimedia Commons categoryDesmanthus4food · CC BY-SA 3.0 us · Wikimedia Commons ↗

Verbatim

e0

“Azolla incorporation before planting and also once intercropped with rice produced more grain yield than 60 kg N during the wet season.”

✓ located verbatim in the source · abstract, characters 647–782 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Azolla intercropped once produced more rice grain yield than 60 kg N during the wet season.

Treatment
once intercropped with ricee0
Outcome
grain yielde0
Direction
moree0
Comparator
60 kg Ne0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Oryza sativa
Oryza sativa · Taxon · picture from its Wikimedia Commons categoryDesmanthus4food · CC BY-SA 3.0 us · Wikimedia Commons ↗

Verbatim

e0

“Azolla incorporation before planting and also once intercropped with rice produced more grain yield than 60 kg N during the wet season.”

✓ located verbatim in the source · abstract, characters 647–782 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Twice intercropped Azolla had comparatively lower grain yield among Azolla treatments.

Treatment
Azolla twice intercropped with ricee0
Outcome
grain yielde0
Direction
lowere0
Comparator
Azolla treatmentse0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Oryza sativa
Oryza sativa · Taxon · picture from its Wikimedia Commons categoryDesmanthus4food · CC BY-SA 3.0 us · Wikimedia Commons ↗

Verbatim

e0

“Among Azolla treatments, Azolla twice intercropped with rice produced comparatively lower grain yield.”

✓ located verbatim in the source · abstract, characters 783–885 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Azolla increased panicle and grain counts.

Treatment
Azolla applicatione0
Outcome
number of panicles/m 2 , number of grains/paniclee0
Direction
increasede0

Not reportedTaxonComparator

Verbatim

e0

“Azolla application increased the number of panicles/m 2 , number of grains/panicle”

✓ located verbatim in the source · abstract, characters 886–968 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Azolla reduced sterility in both seasons.

Treatment
Azolla applicatione0
Outcome
sterilitye0
Direction
reducede0

Not reportedTaxonComparator

Verbatim

e0

“Azolla application increased the number of panicles/m 2 , number of grains/panicle and reduced sterility during both seasons.”

✓ located verbatim in the source · abstract, characters 886–1011 · show in text ↑
Intervention effectobservedoriginal resultmeasured

Claim · model-written summary

Preplant Azolla with 30 kg N/ha gave rice nitrogen uptake similar to 60 kg N/ha.

Treatment
Azolla incorporation before plantinge0
Outcome
N uptakee0
Direction
similare0
Comparator
60 kg N/hae0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Oryza sativa
Oryza sativa · Taxon · picture from its Wikimedia Commons categoryDesmanthus4food · CC BY-SA 3.0 us · Wikimedia Commons ↗

Verbatim

e0

“The N uptake of the rice crop in the treatments of Azolla incorporation before planting or intercropped once with rice in combination with 30 kg N/ha was similar to that of the 60 kg N/ha”

✓ located verbatim in the source · abstract, characters 1012–1199 · show in text ↑
Intervention effectobservedoriginal resultmeasured

Claim · model-written summary

Once intercropped Azolla with 30 kg N/ha gave rice nitrogen uptake similar to 60 kg N/ha.

Treatment
intercropped once with rice in combination with 30 kg N/hae0
Outcome
N uptakee0
Direction
similare0
Comparator
60 kg N/hae0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Oryza sativa
Oryza sativa · Taxon · picture from its Wikimedia Commons categoryDesmanthus4food · CC BY-SA 3.0 us · Wikimedia Commons ↗

Verbatim

e0

“The N uptake of the rice crop in the treatments of Azolla incorporation before planting or intercropped once with rice in combination with 30 kg N/ha was similar to that of the 60 kg N/ha”

✓ located verbatim in the source · abstract, characters 1012–1199 · show in text ↑

Azolla · yield · Oryza sativa (rice)Positive and negative results

47 papers: 43 positive, 4 negative or no effect

42 papers in the same direction as this paper · 1 in the opposite direction · 3 reporting no difference from an alternative

  1. no effect
  2. no effect
  3. no effect

43 papers more in this group

See all 47 papers →

Azolla pinnata · yield · Oryza sativa (rice)Results agree

4 papers: 4 positive, 0 negative or no effect

3 papers in the same direction as this paper

  1. positive
  2. positive
  3. positive
See all 4 papers →

Azolla pinnata · nutrient: content · Oryza sativa (rice)Results agree

4 papers: 4 positive, 0 negative or no effect

3 papers in the same direction as this paper

  1. positive
  2. positive
  3. positive
See all 4 papers →

intercropping · yield · Oryza sativa (rice)Results differ

95 papers: 77 positive, 18 negative or no effect

76 papers in the same direction as this paper · 15 in the opposite direction · 3 reporting no difference from an alternative

  1. negative
  2. negative
  3. no effect

91 papers more in this group

See all 95 papers →

fertilization · nutrient: content · Oryza sativa (rice)Positive and negative results

993 papers: 932 positive, 61 negative or no effect

931 papers in the same direction as this paper · 56 in the opposite direction · 5 reporting no difference from an alternative

  1. negative
  2. no effect
  3. no effect

989 papers more in this group

See all 993 papers →

nitrogen · yield · Oryza sativa (rice)Positive and negative results

2,045 papers: 1,803 positive, 242 negative or no effect

1,802 papers in the same direction as this paper · 193 in the opposite direction · 49 reporting no difference from an alternative

  1. negative
  2. negative
  3. negative

2,041 papers more in this group

See all 2,045 papers →

fertilization · yield · Oryza sativa (rice)Positive and negative results

3,455 papers: 3,183 positive, 272 negative or no effect

3,182 papers in the same direction as this paper · 207 in the opposite direction · 65 reporting no difference from an alternative

  1. no effect
  2. no effect
  3. negative

3,451 papers more in this group

See all 3,455 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.