Abstract
Efficient use of N in agricultural practice can increase yield, decrease production costs and reduce the risk of environmental pollution. Effects of N fertilizer application rates on grain yield and physiological N use efficiency (PE) in relation to the accumulation and redistribution of biomass and N in rice (Oryza sativa L.) cultivars were studied at two experimental farms of Nanjing Agricultural University, Nanjing, China in 2004. Three high N use efficiency (NUE) rice cultivars (Wuyunjing 7, Nanguang and 4007) and one low NUE rice cultivar (Elio) with similar growth patterns were studied under seven N rates (0, 60, 120, 180, 240, 300 and 360 kg ha -1 ). Grain yield increased with the N application rate and attained plateau at 180 kg N ha -1 for rice cultivars at each site. Increasing N rate decreased PE for biomass and grain yield. Grain yield and PE of Elio were about 20% and 18% lower than those of high NUE cultivars. Differences in biomass, N accumulation and N redistribution were observed at the post-heading stage among rice cultivars with differing NUEs. The less reproductive tillers of Elio resulted in less demand for C and N during grain filling, thus leading to lower PE of Elio compared with the high NUE rice cultivars.
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Claims 7
Claim · model-written summary
Grain yield of rice increased with the N application rate.
- Taxon
- rice
Oryza sativae0 - Treatment
- N application ratee1
- Outcome
- Grain yielde1
- Direction
- increasede1
- Setting
- Nanjing, Chinae3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effects of N fertilizer application rates on grain yield and physiological N use efficiency (PE) in relation to the accumulation and redistribution of biomass and N in rice (Oryza sativa L.) cultivars were studied”
e1“Grain yield increased with the N application rate”
e3“at two experimental farms of Nanjing Agricultural University, Nanjing, China in 2004”
Claim · model-written summary
Grain yield of rice reached a plateau at 180 kg N/ha.
- Taxon
- riceOryza sativae0
- Treatment
- 180 kg N ha -1e2
- Outcome
- Grain yielde2
- Direction
- attained plateaue2
- Setting
- Nanjing, Chinae3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effects of N fertilizer application rates on grain yield and physiological N use efficiency (PE) in relation to the accumulation and redistribution of biomass and N in rice (Oryza sativa L.) cultivars were studied”
e2“Grain yield increased with the N application rate and attained plateau at 180 kg N ha -1 for rice cultivars at each site”
e3“at two experimental farms of Nanjing Agricultural University, Nanjing, China in 2004”
Claim · model-written summary
Increasing N rate decreased physiological N use efficiency for biomass and grain yield.
- Taxon
- riceOryza sativae0
- Treatment
- N ratee4
- Outcome
- PE for biomass and grain yielde4
- Direction
- decreasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effects of N fertilizer application rates on grain yield and physiological N use efficiency (PE) in relation to the accumulation and redistribution of biomass and N in rice (Oryza sativa L.) cultivars were studied”
e4“Increasing N rate decreased PE for biomass and grain yield”
Claim · model-written summary
Grain yield of the low-NUE cultivar Elio was about 20% lower than that of high-NUE cultivars.
- Taxon
- riceOryza sativae0
- Material
- Elioe5
- Outcome
- Grain yielde5
- Direction
- lowere5
- Value
- about 20%e5
- Comparator
- high NUE cultivarse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effects of N fertilizer application rates on grain yield and physiological N use efficiency (PE) in relation to the accumulation and redistribution of biomass and N in rice (Oryza sativa L.) cultivars were studied”
e5“Grain yield and PE of Elio were about 20% and 18% lower than those of high NUE cultivars”
Claim · model-written summary
Physiological N use efficiency of the low-NUE cultivar Elio was about 18% lower than that of high-NUE cultivars.
- Taxon
- riceOryza sativae0
- Material
- Elioe5
- Outcome
- PEe5
- Direction
- lowere5
- Value
- 18%e5
- Comparator
- high NUE cultivarse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effects of N fertilizer application rates on grain yield and physiological N use efficiency (PE) in relation to the accumulation and redistribution of biomass and N in rice (Oryza sativa L.) cultivars were studied”
e5“Grain yield and PE of Elio were about 20% and 18% lower than those of high NUE cultivars”
Claim · model-written summary
Differences in biomass, N accumulation and N redistribution among rice cultivars with differing NUE were observed at the post-heading stage.
- Taxon
- riceOryza sativae0
- Material
- rice cultivars with differing NUEse6
- Organ / stage
- post-heading stagee6
- Outcome
- biomass, N accumulation and N redistributione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effects of N fertilizer application rates on grain yield and physiological N use efficiency (PE) in relation to the accumulation and redistribution of biomass and N in rice (Oryza sativa L.) cultivars were studied”
e6“Differences in biomass, N accumulation and N redistribution were observed at the post-heading stage among rice cultivars with differing NUEs”
Claim · model-written summary
Fewer reproductive tillers in Elio led to less demand for C and N during grain filling and thus lower PE than in high-NUE cultivars.
- Taxon
- riceOryza sativae0
- Material
- Elioe7
- Outcome
- lower PE of Elioe7
- Qualifier
- less reproductive tillerse7
- Comparator
- high NUE rice cultivarse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effects of N fertilizer application rates on grain yield and physiological N use efficiency (PE) in relation to the accumulation and redistribution of biomass and N in rice (Oryza sativa L.) cultivars were studied”
e7“The less reproductive tillers of Elio resulted in less demand for C and N during grain filling, thus leading to lower PE of Elio compared with the high NUE rice cultivars”
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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.