Abstract
Dense planting with reducing nitrogen rate (DPRN) is a sustainable strategy to improve rice yield and nitrogen (N) use efficiency. Nevertheless, the feasibility of such strategy under low light stress condition has not been examined in detail. Two field experiments and a micro-plot experiment were conducted to evaluate the performance of DPRN and sparse planting with high N rate (SPHN) under two light conditions (L0, natural light intensity and L1, 30% of L0) with two contrasting hybrid rice varieties (Yliangyou 1 and Luoyou 9348) in 2014 and 2015. In field experiments, L1 resulted in sharp decline in grain filling, 1000-grain weight, biomass, harvest index, N uptake, N use efficiency for grain production and partial factor productivity of applied N fertilizer, and consequently 41.2–53.4% grain yield loss for two varieties in comparison with L0. Interestingly, 8.6–13.5% higher grain yield, and better performance of yield components and N use efficiency were observed from DPRN than SPHN across two light conditions. In micro-plot experiment, responses of grain dry weight and yield-attributing traits to light intensity and crop managements were similar to those in field experiments. No difference was observed in N uptake from fertilizer, N recovery rate, N retention rate and N loss rate between L0 and L1, while DPRN increased N recovery rate by 14.8% and N retention rate by 35.1%, and consequently decreased N loss rate by 29.4% across two light conditions compared with SPHN. The differences in responses of grain yield and related parameters to low light stress (L1) between the two cultivars were small. These results suggest that DPRN is also feasible to increase grain yield and N use efficiency for hybrid rice varieties grown under two light conditions.
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Claims 14
Claim · model-written summary
Low light (L1) reduced grain filling, 1000-grain weight and biomass of hybrid rice relative to natural light.
- Taxon
- hybrid rice
Oryza sativat1 - Material
- Yliangyou 1 and Luoyou 9348e2
- Treatment
- L1, 30% of L0e3
- Outcome
- grain filling, 1000-grain weight, biomasse1
- Direction
- sharp declinee1
- Comparator
- L0e1
- Setting
- field experimentse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“hybrid rice varieties”
e1“In field experiments, L1 resulted in sharp decline in grain filling, 1000-grain weight, biomass, harvest index, N uptake, N use efficiency for grain production and partial factor productivity of applied N fertilizer, and consequently 41.2–53.4% grain yield loss for two varieties in comparison with L0”
e2“two contrasting hybrid rice varieties (Yliangyou 1 and Luoyou 9348)”
e3“L1, 30% of L0”
Claim · model-written summary
Low light (L1) reduced harvest index, N uptake and N use efficiency for grain production of hybrid rice.
- Taxon
- hybrid riceOryza sativat1
- Material
- Yliangyou 1 and Luoyou 9348e2
- Treatment
- L1, 30% of L0e3
- Outcome
- harvest index, N uptake, N use efficiency for grain productione1
- Direction
- sharp declinee1
- Comparator
- L0e1
- Setting
- field experimentse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“hybrid rice varieties”
e1“In field experiments, L1 resulted in sharp decline in grain filling, 1000-grain weight, biomass, harvest index, N uptake, N use efficiency for grain production and partial factor productivity of applied N fertilizer, and consequently 41.2–53.4% grain yield loss for two varieties in comparison with L0”
e2“two contrasting hybrid rice varieties (Yliangyou 1 and Luoyou 9348)”
e3“L1, 30% of L0”
Claim · model-written summary
Low light (L1) reduced the partial factor productivity of applied N fertilizer in hybrid rice.
- Taxon
- hybrid riceOryza sativat1
- Material
- Yliangyou 1 and Luoyou 9348e2
- Treatment
- L1, 30% of L0e3
- Outcome
- partial factor productivity of applied N fertilizere1
- Direction
- sharp declinee1
- Comparator
- L0e1
- Setting
- field experimentse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“hybrid rice varieties”
e1“In field experiments, L1 resulted in sharp decline in grain filling, 1000-grain weight, biomass, harvest index, N uptake, N use efficiency for grain production and partial factor productivity of applied N fertilizer, and consequently 41.2–53.4% grain yield loss for two varieties in comparison with L0”
e2“two contrasting hybrid rice varieties (Yliangyou 1 and Luoyou 9348)”
e3“L1, 30% of L0”
Claim · model-written summary
Low light (L1) caused 41.2–53.4% grain yield loss in the two hybrid rice varieties compared with natural light.
- Taxon
- hybrid riceOryza sativat1
- Material
- Yliangyou 1 and Luoyou 9348e2
- Treatment
- L1, 30% of L0e3
- Outcome
- grain yield losse1
- Direction
- decreaseinferrede1
- Value
- 41.2–53.4%e1
- Comparator
- L0e1
- Setting
- field experimentse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“hybrid rice varieties”
e1“In field experiments, L1 resulted in sharp decline in grain filling, 1000-grain weight, biomass, harvest index, N uptake, N use efficiency for grain production and partial factor productivity of applied N fertilizer, and consequently 41.2–53.4% grain yield loss for two varieties in comparison with L0”
e2“two contrasting hybrid rice varieties (Yliangyou 1 and Luoyou 9348)”
e3“L1, 30% of L0”
Claim · model-written summary
DPRN gave 8.6–13.5% higher grain yield than SPHN across two light conditions.
- Taxon
- hybrid riceOryza sativat1
- Treatment
- DPRNe4
- Outcome
- grain yielde4
- Direction
- highere4
- Value
- 8.6–13.5%e4
- Comparator
- SPHNe4
- Setting
- two light conditionse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“hybrid rice varieties”
e4“Interestingly, 8.6–13.5% higher grain yield, and better performance of yield components and N use efficiency were observed from DPRN than SPHN across two light conditions”
Claim · model-written summary
DPRN gave better performance of yield components and N use efficiency than SPHN across two light conditions.
- Taxon
- hybrid riceOryza sativat1
- Treatment
- DPRNe4
- Outcome
- performance of yield components and N use efficiencye4
- Direction
- bettere4
- Comparator
- SPHNe4
- Setting
- two light conditionse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“hybrid rice varieties”
e4“Interestingly, 8.6–13.5% higher grain yield, and better performance of yield components and N use efficiency were observed from DPRN than SPHN across two light conditions”
Claim · model-written summary
Responses of grain dry weight and yield-attributing traits to light and crop management in the micro-plot were similar to those in field experiments.
- Taxon
- hybrid riceOryza sativat1
- Treatment
- light intensity and crop managementse5
- Outcome
- responses of grain dry weight and yield-attributing traitse5
- Direction
- similare5
- Comparator
- field experimentse5
- Setting
- micro-plot experimente5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“hybrid rice varieties”
e5“In micro-plot experiment, responses of grain dry weight and yield-attributing traits to light intensity and crop managements were similar to those in field experiments”
Claim · model-written summary
No difference was observed in N uptake from fertilizer, N recovery rate and N retention rate between L0 and L1.
- Taxon
- hybrid riceOryza sativat1
- Treatment
- L1e6
- Outcome
- N uptake from fertilizer, N recovery rate, N retention ratee6
- Direction
- No differencee6
- Comparator
- L0e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“hybrid rice varieties”
e6“No difference was observed in N uptake from fertilizer, N recovery rate, N retention rate and N loss rate between L0 and L1”
Claim · model-written summary
No difference was observed in N loss rate between L0 and L1.
- Taxon
- hybrid riceOryza sativat1
- Treatment
- L1e6
- Outcome
- N loss ratee6
- Direction
- No differencee6
- Comparator
- L0e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“hybrid rice varieties”
e6“No difference was observed in N uptake from fertilizer, N recovery rate, N retention rate and N loss rate between L0 and L1”
Claim · model-written summary
DPRN increased N recovery rate by 14.8% compared with SPHN across two light conditions.
- Taxon
- hybrid riceOryza sativat1
- Treatment
- DPRNe7
- Outcome
- N recovery ratee7
- Direction
- increasede7
- Value
- 14.8%e7
- Comparator
- SPHNe7
- Setting
- two light conditionse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“hybrid rice varieties”
e7“DPRN increased N recovery rate by 14.8% and N retention rate by 35.1%, and consequently decreased N loss rate by 29.4% across two light conditions compared with SPHN”
Claim · model-written summary
DPRN increased N retention rate by 35.1% compared with SPHN across two light conditions.
- Taxon
- hybrid riceOryza sativat1
- Treatment
- DPRNe7
- Outcome
- N retention ratee7
- Direction
- increasede7
- Value
- 35.1%e7
- Comparator
- SPHNe7
- Setting
- two light conditionse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“hybrid rice varieties”
e7“DPRN increased N recovery rate by 14.8% and N retention rate by 35.1%, and consequently decreased N loss rate by 29.4% across two light conditions compared with SPHN”
Claim · model-written summary
DPRN decreased N loss rate by 29.4% compared with SPHN across two light conditions.
- Taxon
- hybrid riceOryza sativat1
- Treatment
- DPRNe7
- Outcome
- N loss ratee7
- Direction
- decreasede7
- Value
- 29.4%e7
- Comparator
- SPHNe7
- Setting
- two light conditionse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“hybrid rice varieties”
e7“DPRN increased N recovery rate by 14.8% and N retention rate by 35.1%, and consequently decreased N loss rate by 29.4% across two light conditions compared with SPHN”
Claim · model-written summary
Differences in responses of grain yield and related parameters to low light between the two cultivars were small.
- Taxon
- hybrid riceOryza sativat1
- Material
- Yliangyou 1 and Luoyou 9348e2
- Treatment
- low light stress (L1)e3
- Outcome
- differences in responses of grain yield and related parameterse3
- Direction
- smalle3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“hybrid rice varieties”
e2“two contrasting hybrid rice varieties (Yliangyou 1 and Luoyou 9348)”
e3“The differences in responses of grain yield and related parameters to low light stress (L1) between the two cultivars were small”
Claim · model-written summary
DPRN is feasible to increase grain yield and N use efficiency for hybrid rice grown under two light conditions.
- Taxon
- hybrid rice varietiesOryza sativae2
- Treatment
- DPRNe2
- Outcome
- feasible to increase grain yield and N use efficiencye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“hybrid rice varieties”
e2“These results suggest that DPRN is also feasible to increase grain yield and N use efficiency for hybrid rice varieties grown under two light conditions”
The same questions in other 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
- no effect
- 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.