Abstract
Maintaining rice yield and reducing nitrogen (N) input are two important targets in sustainable agriculture practices. The adoption of a nitrogen-saving variety (NSV) provides a unique opportunity to achieve this. However, limited options in NSV japonica rice and a lack of information on their responses to N reduction make management decisions difficult. This study aims to explore the responses of yield and nitrogen use efficiency (NUE) in NSV to N reduction. Two newly released NSVs and two popular general varieties (GVs) of japonica rice were field tested in Yangzhou, located at the lower reaches of Yangtze River of China, in two consecutive years. The results showed that for NSVs, with a 40–60% reduction in common practice N rate (300 Kg ha−1), the rice yield could maintain a record average level (p < 0.05), whereas the yield for the GV would drop 20–30% (p < 0.05). This indicates that combining the practices of adoption of NSV and N reduction to 120–180 Kg N ha−1 could balance the yield and N consumption. Moderate N reduction promotes the N accumulation and NUE, and it increases the number of tillers, the productive tiller percentage and the total amount of spikelets in the population, and increases the carbon and N metabolism of the population in the NSV. Compared with GV, NSV showed higher NUE and non-structural carbohydrate re-mobilization in the reduced N rate. The results showed that the practice of N reduction has to adopt NSV at the same time in order to maintain the grain yield level in rice.
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Claims 8
Claim · model-written summary
With a 40–60% reduction in common practice N rate, NSV rice yield was maintained at a record average level.
- Taxon
- japonica rice
_by_Augustus_Binu.jpg?width=60)
Oryza sativa Japonica Groupe0 - Material
- NSVse0
- Treatment
- 40–60% reduction in common practice N ratee1
- Outcome
- rice yielde2
- Direction
- maintaine2
- Qualifier
- p < 0.05e2
- Comparator
- common practice N ratee1
- Setting
- Yangzhoue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_by_Augustus_Binu.jpg?width=500)
Verbatim
e0“Two newly released NSVs and two popular general varieties (GVs) of japonica rice were field tested in Yangzhou, located at the lower reaches of Yangtze River of China, in two consecutive years”
e1“for NSVs, with a 40–60% reduction in common practice N rate”
e2“the rice yield could maintain a record average level (p < 0.05), whereas the yield for the GV would drop 20–30% (p < 0.05)”
Claim · model-written summary
With the same N reduction, yield of the general variety dropped by 20–30%.
- Taxon
- japonica riceOryza sativa Japonica Groupe0
- Material
- GVe2
- Treatment
- 40–60% reduction in common practice N ratee1
- Outcome
- yielde2
- Direction
- drope2
- Value
- 20–30%e2
- Qualifier
- p < 0.05e2
- Comparator
- NSVse1
- Setting
- Yangzhoue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two newly released NSVs and two popular general varieties (GVs) of japonica rice were field tested in Yangzhou, located at the lower reaches of Yangtze River of China, in two consecutive years”
e1“for NSVs, with a 40–60% reduction in common practice N rate”
e2“the rice yield could maintain a record average level (p < 0.05), whereas the yield for the GV would drop 20–30% (p < 0.05)”
Claim · model-written summary
Combining NSV adoption with N reduction to 120–180 Kg N ha−1 could balance yield and N consumption.
- Taxon
- japonica riceOryza sativa Japonica Groupe0
- Outcome
- balance the yield and N consumptione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two newly released NSVs and two popular general varieties (GVs) of japonica rice were field tested in Yangzhou, located at the lower reaches of Yangtze River of China, in two consecutive years”
e3“combining the practices of adoption of NSV and N reduction to 120–180 Kg N ha−1 could balance the yield and N consumption”
Claim · model-written summary
Moderate N reduction promoted N accumulation and NUE.
- Taxon
- japonica riceOryza sativa Japonica Groupe0
- Treatment
- Moderate N reductione4
- Outcome
- N accumulation and NUEe4
- Direction
- promotese4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two newly released NSVs and two popular general varieties (GVs) of japonica rice were field tested in Yangzhou, located at the lower reaches of Yangtze River of China, in two consecutive years”
e4“Moderate N reduction promotes the N accumulation and NUE, and it increases the number of tillers, the productive tiller percentage and the total amount of spikelets in the population, and increases the carbon and N metabolism of the population in the NSV”
Claim · model-written summary
Moderate N reduction increased the number of tillers, the productive tiller percentage and the total amount of spikelets.
- Taxon
- japonica riceOryza sativa Japonica Groupe0
- Treatment
- Moderate N reductione4
- Outcome
- number of tillers, the productive tiller percentage and the total amount of spikeletse4
- Direction
- increasese4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two newly released NSVs and two popular general varieties (GVs) of japonica rice were field tested in Yangzhou, located at the lower reaches of Yangtze River of China, in two consecutive years”
e4“Moderate N reduction promotes the N accumulation and NUE, and it increases the number of tillers, the productive tiller percentage and the total amount of spikelets in the population, and increases the carbon and N metabolism of the population in the NSV”
Claim · model-written summary
Moderate N reduction increased carbon and N metabolism of the population in the NSV.
- Taxon
- japonica riceOryza sativa Japonica Groupe0
- Material
- NSVe4
- Treatment
- Moderate N reductione4
- Outcome
- carbon and N metabolism of the populatione4
- Direction
- increasese4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two newly released NSVs and two popular general varieties (GVs) of japonica rice were field tested in Yangzhou, located at the lower reaches of Yangtze River of China, in two consecutive years”
e4“Moderate N reduction promotes the N accumulation and NUE, and it increases the number of tillers, the productive tiller percentage and the total amount of spikelets in the population, and increases the carbon and N metabolism of the population in the NSV”
Claim · model-written summary
Compared with the GV, the NSV showed higher NUE and non-structural carbohydrate re-mobilization under reduced N rate.
- Taxon
- japonica riceOryza sativa Japonica Groupe0
- Material
- NSVe5
- Treatment
- reduced N ratee5
- Outcome
- NUE and non-structural carbohydrate re-mobilizatione5
- Direction
- highere5
- Comparator
- GVe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two newly released NSVs and two popular general varieties (GVs) of japonica rice were field tested in Yangzhou, located at the lower reaches of Yangtze River of China, in two consecutive years”
e5“Compared with GV, NSV showed higher NUE and non-structural carbohydrate re-mobilization in the reduced N rate”
Claim · model-written summary
NSV adoption with N reduction is needed to maintain the grain yield level in rice.
- Taxon
- rice
Oryza sativae6 - Outcome
- maintain the grain yield levele6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“The results showed that the practice of N reduction has to adopt NSV at the same time in order to maintain the grain yield level in rice”
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
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