Abstract
Yield formation and growth of “super” rice (Oryza sativa L.) was affected by nitrogen application, and the response of rice to nitrogen application varies with genotype, environment and management practices. In this study, five local typical rice varieties were used to study their yield formation and growth in response to nitrogen application in South China double cropping region. Field trials with three nitrogen rates (N 0, 187.5 and 225 kg ha -1 ) and five varieties were conducted in the experimental farm of South China Agricultural University in the early and late season of 2010. Rice yield and its components, aboveground total dry weight (TDW), crops growth rate (CGR), SPAD value, leaf area index (LAI), Plant height, agronomic Nuse efficiency (AE) and partial factor productivity of N fertilizer (PFP) were examined. The results showed that, N 187.5 kg ha -1 had the highest leaf area index at full heading, crop growth rate from full heading to maturity as well as total dry weight at maturity, which resulted in a significantly high increase in grain yield from 24.19-29.84% and 5.01-6.26% as compared to N 0 and 225 kg ha -1 , respectively, N 187.5 kg ha -1 showed a significant increase in agronomic N-use efficiency and partial factor productivity of N fertilizer by 38.80-61.14% and 24.30-27.42% as compared to N 225 kg ha -1 in both seasons. As for varieties, Fengmeizhan and Yuxiangyouzhan obtained higher yield of 7.33 and 7.04 t ha -1 in early and late season, respectively. The average grain yield was 4.44% higher in early rice than in late rice. It indicated that varieties showed difference in response to seasons, and application of N 187.5 kg ha -1 will get higher yield.
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Claims 7
Claim · model-written summary
187.5 kg N per hectare gave the highest leaf area index at full heading, crop growth rate, and total dry weight.
- Taxon
- rice (Oryza sativa L.)
Oryza sativat0 - Treatment
- N 187.5 kg ha -1e0
- Outcome
- leaf area index at full heading, crop growth rate from full heading to maturity as well as total dry weight at maturitye0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N 187.5 kg ha -1 had the highest leaf area index at full heading, crop growth rate from full heading to maturity as well as total dry weight at maturity”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
187.5 kg N per hectare increased agronomic N-use efficiency by 38.80-61.14% relative to 225 kg.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Treatment
- N 187.5 kg ha -1e0
- Outcome
- agronomic N-use efficiencye0
- Direction
- increasee0
- Value
- 38.80-61.14%e0
- Comparator
- N 225 kg ha -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N 187.5 kg ha -1 showed a significant increase in agronomic N-use efficiency and partial factor productivity of N fertilizer by 38.80-61.14% and 24.30-27.42% as compared to N 225 kg ha -1 in both seasons.”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
187.5 kg N per hectare increased partial factor productivity by 24.30-27.42% relative to 225 kg.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Treatment
- N 187.5 kg ha -1e0
- Outcome
- partial factor productivity of N fertilizere0
- Direction
- increasee0
- Value
- 24.30-27.42%e0
- Comparator
- N 225 kg ha -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N 187.5 kg ha -1 showed a significant increase in agronomic N-use efficiency and partial factor productivity of N fertilizer by 38.80-61.14% and 24.30-27.42% as compared to N 225 kg ha -1 in both seasons.”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Fengmeizhan yielded 7.33 t ha -1 in the early season.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Material
- Fengmeizhane0
- Outcome
- yielde0
- Direction
- highere0
- Value
- 7.33e0
- Qualifier
- early and late seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fengmeizhan and Yuxiangyouzhan obtained higher yield of 7.33 and 7.04 t ha -1 in early and late season, respectively.”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Yuxiangyouzhan yielded 7.04 t ha -1 in the late season.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Material
- Yuxiangyouzhane0
- Outcome
- yielde0
- Direction
- highere0
- Value
- 7.04 t ha -1e0
- Qualifier
- early and late seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fengmeizhan and Yuxiangyouzhan obtained higher yield of 7.33 and 7.04 t ha -1 in early and late season, respectively.”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Average grain yield was 4.44% higher in early than late rice.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Outcome
- average grain yielde0
- Direction
- highere0
- Value
- 4.44%e0
- Comparator
- late ricee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The average grain yield was 4.44% higher in early rice than in late rice.”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
The authors conclude that applying 187.5 kg N per hectare will give higher yield.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Outcome
- application of N 187.5 kg ha -1e0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of N 187.5 kg ha -1 will get higher yield.”
t0“rice (Oryza sativa L.)”
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