Abstract
Abstract Field experiment to assess the impact of radiation, temperature and foliar N application on rice was conducted. The treatments comprised of four sunlight levels, [control, 50% intensity during start to maximum tillering (R 15–45 ), maximum tillering to booting (R 46–75 ) and panicle emergence to maturity (R 76–105 ) corresponding to 15–45, 46–75 and 76–105 days after transplanting] and 5 levels of foliar nitrogen [control, spray of 3% urea solution in water before (N B ), midway (N M ), afterwards (N A ) and midway + afterwards (N MA ) reduction in sunlight]. Results showed that leaf chlorophyll had an inverse relationship with radiation intensity. The R 46–75 significantly reduced effective tillers (13.1–16.4%), R 46–75 and R 76–105 reduced grains/panicle (7.15–12.5%) as compared to control. N B produced significantly higher effective tillers (21.9–24.7%) and grains/panicle (12.2–12.9%) as compared to control. The reduction in sunlight and application of foliar nitrogen increased the minimum cooking time and decreased elongation ratio. Averaged over locations, R 15–45 , R 46–75 and R 76–105 decreased the yield significantly as compared to control by 9.29–11.3, 14.4–16.3 and 8.17–10.6%, respectively. The N B significantly increased grain yield as compared to control by 10.3% (Ludhiana) and 9.45% (Hoshiarpur). A decrease in maximum temperature ( T max ) by 2.85–5.70% (1–2°C) of 35.1°C, at 1416 μmol/m 2 /s of photosynthetically active radiation (PAR) increased rice productivity by 10.6–21.0%, while a similar decrease in PAR by 2.85–5.70% at a T max of 35.1°C, decreased the productivity by 2.05–4.10%. So, decrease in T max due to cloudy weather might have a positive influence while negative impact of deficit radiation may be mitigated by foliar application of 3% urea prior to/during the cloudy weather.
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Claims 17
Claim · model-written summary
Rice leaf chlorophyll was inversely related to radiation intensity.
Not reportedTaxon
Verbatim
e0“leaf chlorophyll had an inverse relationship with radiation intensity”
Claim · model-written summary
R 46–75 reduced effective tillers by 13.1–16.4% compared with control.
Not reportedTaxonComparator
Verbatim
e0“R 46–75 significantly reduced effective tillers (13.1–16.4%)”
Claim · model-written summary
R 46–75 and R 76–105 reduced grains per panicle by 7.15–12.5%.
- Treatment
- R 46–75 and R 76–105e0
- Outcome
- grains/paniclee0
- Direction
- reducede0
- Value
- 7.15–12.5%e0
- Comparator
- controle0
Not reportedTaxon
Verbatim
e0“R 46–75 and R 76–105 reduced grains/panicle (7.15–12.5%) as compared to control”
Claim · model-written summary
N B increased effective tillers by 21.9–24.7% compared with control.
Not reportedTaxon
Verbatim
e0“N B produced significantly higher effective tillers (21.9–24.7%) and grains/panicle (12.2–12.9%) as compared to control”
Claim · model-written summary
N B increased grains per panicle by 12.2–12.9% compared with control.
Not reportedTaxon
Verbatim
e0“N B produced significantly higher effective tillers (21.9–24.7%) and grains/panicle (12.2–12.9%) as compared to control”
Claim · model-written summary
Reduced sunlight increased minimum cooking time.
Not reportedTaxonComparator
Verbatim
e0“The reduction in sunlight and application of foliar nitrogen increased the minimum cooking time and decreased elongation ratio”
Claim · model-written summary
Foliar nitrogen increased minimum cooking time.
Not reportedTaxonComparator
Verbatim
e0“The reduction in sunlight and application of foliar nitrogen increased the minimum cooking time and decreased elongation ratio”
Claim · model-written summary
Reduced sunlight decreased elongation ratio.
Not reportedTaxonComparator
Verbatim
e0“The reduction in sunlight and application of foliar nitrogen increased the minimum cooking time and decreased elongation ratio”
Claim · model-written summary
Foliar nitrogen decreased elongation ratio.
Not reportedTaxonComparator
Verbatim
e0“The reduction in sunlight and application of foliar nitrogen increased the minimum cooking time and decreased elongation ratio”
Claim · model-written summary
R 15–45 decreased yield by 9.29–11.3 relative to control.
Not reportedTaxon
Verbatim
e0“R 15–45 , R 46–75 and R 76–105 decreased the yield significantly as compared to control by 9.29–11.3, 14.4–16.3 and 8.17–10.6%, respectively”
Claim · model-written summary
R 46–75 decreased yield by 14.4–16.3 relative to control.
Not reportedTaxon
Verbatim
e0“R 15–45 , R 46–75 and R 76–105 decreased the yield significantly as compared to control by 9.29–11.3, 14.4–16.3 and 8.17–10.6%, respectively”
Claim · model-written summary
R 76–105 decreased yield by 8.17–10.6% relative to control.
Not reportedTaxon
Verbatim
e0“R 15–45 , R 46–75 and R 76–105 decreased the yield significantly as compared to control by 9.29–11.3, 14.4–16.3 and 8.17–10.6%, respectively”
Claim · model-written summary
N B raised grain yield by 10.3% in Ludhiana.
- Treatment
- N Be0
- Outcome
- grain yielde0
- Direction
- increasede0
- Value
- 10.3%e0
- Comparator
- controle0
- Setting
- Ludhianae0
Not reportedTaxon
Verbatim
e0“The N B significantly increased grain yield as compared to control by 10.3% (Ludhiana) and 9.45% (Hoshiarpur)”
Claim · model-written summary
N B raised grain yield by 9.45% in Hoshiarpur.
- Treatment
- N Be0
- Outcome
- grain yielde0
- Direction
- increasede0
- Value
- 9.45%e0
- Comparator
- controle0
- Setting
- Hoshiarpure0
Not reportedTaxon
Verbatim
e0“The N B significantly increased grain yield as compared to control by 10.3% (Ludhiana) and 9.45% (Hoshiarpur)”
Claim · model-written summary
A 2.85–5.70% drop in maximum temperature increased rice productivity by 10.6–21.0%.
- Taxon
- rice
Oryza sativae0 - Treatment
- decrease in maximum temperature ( T max ) by 2.85–5.70% (1–2°C)e0
- Outcome
- rice productivitye0
- Direction
- increasede0
- Value
- 10.6–21.0%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A decrease in maximum temperature ( T max ) by 2.85–5.70% (1–2°C) of 35.1°C, at 1416 μmol/m 2 /s of photosynthetically active radiation (PAR) increased rice productivity by 10.6–21.0%”
Claim · model-written summary
A 2.85–5.70% PAR drop decreased productivity by 2.05–4.10%.
- Taxon
- riceOryza sativat0
- Treatment
- decrease in PAR by 2.85–5.70%e0
- Outcome
- productivitye0
- Direction
- decreasede0
- Value
- 2.05–4.10%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“a similar decrease in PAR by 2.85–5.70% at a T max of 35.1°C, decreased the productivity by 2.05–4.10%”
Claim · model-written summary
The authors recommend 3% foliar urea before or during cloudy weather to mitigate radiation deficits.
- Outcome
- foliar application of 3% urea prior to/during the cloudy weathere0
Not reportedTaxon
Verbatim
e0“negative impact of deficit radiation may be mitigated by foliar application of 3% urea prior to/during the cloudy weather”
The same questions in other papers
radiation · yield · Oryza sativa (rice)Results differ
15 papers in the same direction as this paper · 27 in the opposite direction
- negative
- positive
- positive
39 papers more in this group
See all 43 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.