Development of a Critical Nitrogen Dilution Curve of Double Cropping Rice in South China

The concept of critical nitrogen (Nc) concentration can be implemented to diagnose in-season plant nitrogen (N) status for optimizing N fertilizer management. The Nc dilution curves have been established for rice (Oryza sativa L.) grown in different climatic regions, yet no attempt has been made to...
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Autor*in:	Liang Tang [verfasserIn] Zhiyuan He [verfasserIn] Xiaolei Qiu [verfasserIn] Syed Tahir Ata-Ul-Karim [verfasserIn] Yanda Li [verfasserIn] Xiaojun Liu [verfasserIn] Qiang Cao [verfasserIn] Yan Zhu [verfasserIn] Weixing Cao [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2017

Schlagwörter:	late rice early rice critical nitrogen dilution curve nitrogen nutrition index shoot biomass yield

Übergeordnetes Werk:	In: Frontiers in Plant Science - Frontiers Media S.A., 2011, 8(2017)
Übergeordnetes Werk:	volume:8 ; year:2017

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3389/fpls.2017.00638

Katalog-ID:	DOAJ042440270

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520			\|a The concept of critical nitrogen (Nc) concentration can be implemented to diagnose in-season plant nitrogen (N) status for optimizing N fertilizer management. The Nc dilution curves have been established for rice (Oryza sativa L.) grown in different climatic regions, yet no attempt has been made to develop the Nc dilution curve for double cropping rice regions. This study was undertaken to develop the Nc dilution curves for double cropping rice in south China for assessment of in-season N status and to establish the relationships N nutrition index (NNI) and relative yield (RY) for in-season prediction of rice grain yield. Three different N application rate field experiments using six Indica rice varieties, including two early rice hybrids and four late rice hybrids were carried out in east China. The Nc dilution curves based on whole plant N concentration were determined and described as, Nc = 3.37 W−0.44 for early rice and Nc = 3.69 W−0.34 for late rice. The constant N concentration at early growth stage was 3.31 and 3.15% DM for early and late rice, respectively. Late rice showed a higher capacity of N accumulation and a lower rate of N decline per unit shoot biomass as compared to early rice. The curves for present study were different from the existing reference curves for Indica and Japonica rice grown in different rice growing regions. Integrated N nutrition index (NNIint) based on Nc was used to estimate RY at different growth periods using linear regression functions. The results showed that the critical curves and relationship between NNIint and RY could be used as a reliable indicator of N status diagnosis, grain yield prediction as well as to provide technical support in N management for double cropping rice in south China.
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allfields	10.3389/fpls.2017.00638 doi (DE-627)DOAJ042440270 (DE-599)DOAJ7f5e6e806d1f459ea76eca1c39530639 DE-627 ger DE-627 rakwb eng SB1-1110 Liang Tang verfasserin aut Development of a Critical Nitrogen Dilution Curve of Double Cropping Rice in South China 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The concept of critical nitrogen (Nc) concentration can be implemented to diagnose in-season plant nitrogen (N) status for optimizing N fertilizer management. The Nc dilution curves have been established for rice (Oryza sativa L.) grown in different climatic regions, yet no attempt has been made to develop the Nc dilution curve for double cropping rice regions. This study was undertaken to develop the Nc dilution curves for double cropping rice in south China for assessment of in-season N status and to establish the relationships N nutrition index (NNI) and relative yield (RY) for in-season prediction of rice grain yield. Three different N application rate field experiments using six Indica rice varieties, including two early rice hybrids and four late rice hybrids were carried out in east China. The Nc dilution curves based on whole plant N concentration were determined and described as, Nc = 3.37 W−0.44 for early rice and Nc = 3.69 W−0.34 for late rice. The constant N concentration at early growth stage was 3.31 and 3.15% DM for early and late rice, respectively. Late rice showed a higher capacity of N accumulation and a lower rate of N decline per unit shoot biomass as compared to early rice. The curves for present study were different from the existing reference curves for Indica and Japonica rice grown in different rice growing regions. Integrated N nutrition index (NNIint) based on Nc was used to estimate RY at different growth periods using linear regression functions. The results showed that the critical curves and relationship between NNIint and RY could be used as a reliable indicator of N status diagnosis, grain yield prediction as well as to provide technical support in N management for double cropping rice in south China. late rice early rice critical nitrogen dilution curve nitrogen nutrition index shoot biomass yield Plant culture Zhiyuan He verfasserin aut Xiaolei Qiu verfasserin aut Syed Tahir Ata-Ul-Karim verfasserin aut Yanda Li verfasserin aut Xiaojun Liu verfasserin aut Qiang Cao verfasserin aut Yan Zhu verfasserin aut Weixing Cao verfasserin aut In Frontiers in Plant Science Frontiers Media S.A., 2011 8(2017) (DE-627)662359240 (DE-600)2613694-6 1664462X nnns volume:8 year:2017 https://doi.org/10.3389/fpls.2017.00638 kostenfrei https://doaj.org/article/7f5e6e806d1f459ea76eca1c39530639 kostenfrei http://journal.frontiersin.org/article/10.3389/fpls.2017.00638/full kostenfrei https://doaj.org/toc/1664-462X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 8 2017
spelling	10.3389/fpls.2017.00638 doi (DE-627)DOAJ042440270 (DE-599)DOAJ7f5e6e806d1f459ea76eca1c39530639 DE-627 ger DE-627 rakwb eng SB1-1110 Liang Tang verfasserin aut Development of a Critical Nitrogen Dilution Curve of Double Cropping Rice in South China 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The concept of critical nitrogen (Nc) concentration can be implemented to diagnose in-season plant nitrogen (N) status for optimizing N fertilizer management. The Nc dilution curves have been established for rice (Oryza sativa L.) grown in different climatic regions, yet no attempt has been made to develop the Nc dilution curve for double cropping rice regions. This study was undertaken to develop the Nc dilution curves for double cropping rice in south China for assessment of in-season N status and to establish the relationships N nutrition index (NNI) and relative yield (RY) for in-season prediction of rice grain yield. Three different N application rate field experiments using six Indica rice varieties, including two early rice hybrids and four late rice hybrids were carried out in east China. The Nc dilution curves based on whole plant N concentration were determined and described as, Nc = 3.37 W−0.44 for early rice and Nc = 3.69 W−0.34 for late rice. The constant N concentration at early growth stage was 3.31 and 3.15% DM for early and late rice, respectively. Late rice showed a higher capacity of N accumulation and a lower rate of N decline per unit shoot biomass as compared to early rice. The curves for present study were different from the existing reference curves for Indica and Japonica rice grown in different rice growing regions. Integrated N nutrition index (NNIint) based on Nc was used to estimate RY at different growth periods using linear regression functions. The results showed that the critical curves and relationship between NNIint and RY could be used as a reliable indicator of N status diagnosis, grain yield prediction as well as to provide technical support in N management for double cropping rice in south China. late rice early rice critical nitrogen dilution curve nitrogen nutrition index shoot biomass yield Plant culture Zhiyuan He verfasserin aut Xiaolei Qiu verfasserin aut Syed Tahir Ata-Ul-Karim verfasserin aut Yanda Li verfasserin aut Xiaojun Liu verfasserin aut Qiang Cao verfasserin aut Yan Zhu verfasserin aut Weixing Cao verfasserin aut In Frontiers in Plant Science Frontiers Media S.A., 2011 8(2017) (DE-627)662359240 (DE-600)2613694-6 1664462X nnns volume:8 year:2017 https://doi.org/10.3389/fpls.2017.00638 kostenfrei https://doaj.org/article/7f5e6e806d1f459ea76eca1c39530639 kostenfrei http://journal.frontiersin.org/article/10.3389/fpls.2017.00638/full kostenfrei https://doaj.org/toc/1664-462X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 8 2017
allfields_unstemmed	10.3389/fpls.2017.00638 doi (DE-627)DOAJ042440270 (DE-599)DOAJ7f5e6e806d1f459ea76eca1c39530639 DE-627 ger DE-627 rakwb eng SB1-1110 Liang Tang verfasserin aut Development of a Critical Nitrogen Dilution Curve of Double Cropping Rice in South China 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The concept of critical nitrogen (Nc) concentration can be implemented to diagnose in-season plant nitrogen (N) status for optimizing N fertilizer management. The Nc dilution curves have been established for rice (Oryza sativa L.) grown in different climatic regions, yet no attempt has been made to develop the Nc dilution curve for double cropping rice regions. This study was undertaken to develop the Nc dilution curves for double cropping rice in south China for assessment of in-season N status and to establish the relationships N nutrition index (NNI) and relative yield (RY) for in-season prediction of rice grain yield. Three different N application rate field experiments using six Indica rice varieties, including two early rice hybrids and four late rice hybrids were carried out in east China. The Nc dilution curves based on whole plant N concentration were determined and described as, Nc = 3.37 W−0.44 for early rice and Nc = 3.69 W−0.34 for late rice. The constant N concentration at early growth stage was 3.31 and 3.15% DM for early and late rice, respectively. Late rice showed a higher capacity of N accumulation and a lower rate of N decline per unit shoot biomass as compared to early rice. The curves for present study were different from the existing reference curves for Indica and Japonica rice grown in different rice growing regions. Integrated N nutrition index (NNIint) based on Nc was used to estimate RY at different growth periods using linear regression functions. The results showed that the critical curves and relationship between NNIint and RY could be used as a reliable indicator of N status diagnosis, grain yield prediction as well as to provide technical support in N management for double cropping rice in south China. late rice early rice critical nitrogen dilution curve nitrogen nutrition index shoot biomass yield Plant culture Zhiyuan He verfasserin aut Xiaolei Qiu verfasserin aut Syed Tahir Ata-Ul-Karim verfasserin aut Yanda Li verfasserin aut Xiaojun Liu verfasserin aut Qiang Cao verfasserin aut Yan Zhu verfasserin aut Weixing Cao verfasserin aut In Frontiers in Plant Science Frontiers Media S.A., 2011 8(2017) (DE-627)662359240 (DE-600)2613694-6 1664462X nnns volume:8 year:2017 https://doi.org/10.3389/fpls.2017.00638 kostenfrei https://doaj.org/article/7f5e6e806d1f459ea76eca1c39530639 kostenfrei http://journal.frontiersin.org/article/10.3389/fpls.2017.00638/full kostenfrei https://doaj.org/toc/1664-462X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 8 2017
allfieldsGer	10.3389/fpls.2017.00638 doi (DE-627)DOAJ042440270 (DE-599)DOAJ7f5e6e806d1f459ea76eca1c39530639 DE-627 ger DE-627 rakwb eng SB1-1110 Liang Tang verfasserin aut Development of a Critical Nitrogen Dilution Curve of Double Cropping Rice in South China 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The concept of critical nitrogen (Nc) concentration can be implemented to diagnose in-season plant nitrogen (N) status for optimizing N fertilizer management. The Nc dilution curves have been established for rice (Oryza sativa L.) grown in different climatic regions, yet no attempt has been made to develop the Nc dilution curve for double cropping rice regions. This study was undertaken to develop the Nc dilution curves for double cropping rice in south China for assessment of in-season N status and to establish the relationships N nutrition index (NNI) and relative yield (RY) for in-season prediction of rice grain yield. Three different N application rate field experiments using six Indica rice varieties, including two early rice hybrids and four late rice hybrids were carried out in east China. The Nc dilution curves based on whole plant N concentration were determined and described as, Nc = 3.37 W−0.44 for early rice and Nc = 3.69 W−0.34 for late rice. The constant N concentration at early growth stage was 3.31 and 3.15% DM for early and late rice, respectively. Late rice showed a higher capacity of N accumulation and a lower rate of N decline per unit shoot biomass as compared to early rice. The curves for present study were different from the existing reference curves for Indica and Japonica rice grown in different rice growing regions. Integrated N nutrition index (NNIint) based on Nc was used to estimate RY at different growth periods using linear regression functions. The results showed that the critical curves and relationship between NNIint and RY could be used as a reliable indicator of N status diagnosis, grain yield prediction as well as to provide technical support in N management for double cropping rice in south China. late rice early rice critical nitrogen dilution curve nitrogen nutrition index shoot biomass yield Plant culture Zhiyuan He verfasserin aut Xiaolei Qiu verfasserin aut Syed Tahir Ata-Ul-Karim verfasserin aut Yanda Li verfasserin aut Xiaojun Liu verfasserin aut Qiang Cao verfasserin aut Yan Zhu verfasserin aut Weixing Cao verfasserin aut In Frontiers in Plant Science Frontiers Media S.A., 2011 8(2017) (DE-627)662359240 (DE-600)2613694-6 1664462X nnns volume:8 year:2017 https://doi.org/10.3389/fpls.2017.00638 kostenfrei https://doaj.org/article/7f5e6e806d1f459ea76eca1c39530639 kostenfrei http://journal.frontiersin.org/article/10.3389/fpls.2017.00638/full kostenfrei https://doaj.org/toc/1664-462X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 8 2017
allfieldsSound	10.3389/fpls.2017.00638 doi (DE-627)DOAJ042440270 (DE-599)DOAJ7f5e6e806d1f459ea76eca1c39530639 DE-627 ger DE-627 rakwb eng SB1-1110 Liang Tang verfasserin aut Development of a Critical Nitrogen Dilution Curve of Double Cropping Rice in South China 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The concept of critical nitrogen (Nc) concentration can be implemented to diagnose in-season plant nitrogen (N) status for optimizing N fertilizer management. The Nc dilution curves have been established for rice (Oryza sativa L.) grown in different climatic regions, yet no attempt has been made to develop the Nc dilution curve for double cropping rice regions. This study was undertaken to develop the Nc dilution curves for double cropping rice in south China for assessment of in-season N status and to establish the relationships N nutrition index (NNI) and relative yield (RY) for in-season prediction of rice grain yield. Three different N application rate field experiments using six Indica rice varieties, including two early rice hybrids and four late rice hybrids were carried out in east China. The Nc dilution curves based on whole plant N concentration were determined and described as, Nc = 3.37 W−0.44 for early rice and Nc = 3.69 W−0.34 for late rice. The constant N concentration at early growth stage was 3.31 and 3.15% DM for early and late rice, respectively. Late rice showed a higher capacity of N accumulation and a lower rate of N decline per unit shoot biomass as compared to early rice. The curves for present study were different from the existing reference curves for Indica and Japonica rice grown in different rice growing regions. Integrated N nutrition index (NNIint) based on Nc was used to estimate RY at different growth periods using linear regression functions. The results showed that the critical curves and relationship between NNIint and RY could be used as a reliable indicator of N status diagnosis, grain yield prediction as well as to provide technical support in N management for double cropping rice in south China. late rice early rice critical nitrogen dilution curve nitrogen nutrition index shoot biomass yield Plant culture Zhiyuan He verfasserin aut Xiaolei Qiu verfasserin aut Syed Tahir Ata-Ul-Karim verfasserin aut Yanda Li verfasserin aut Xiaojun Liu verfasserin aut Qiang Cao verfasserin aut Yan Zhu verfasserin aut Weixing Cao verfasserin aut In Frontiers in Plant Science Frontiers Media S.A., 2011 8(2017) (DE-627)662359240 (DE-600)2613694-6 1664462X nnns volume:8 year:2017 https://doi.org/10.3389/fpls.2017.00638 kostenfrei https://doaj.org/article/7f5e6e806d1f459ea76eca1c39530639 kostenfrei http://journal.frontiersin.org/article/10.3389/fpls.2017.00638/full kostenfrei https://doaj.org/toc/1664-462X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 8 2017
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callnumber-first	S - Agriculture
author	Liang Tang
spellingShingle	Liang Tang misc SB1-1110 misc late rice misc early rice misc critical nitrogen dilution curve misc nitrogen nutrition index misc shoot biomass misc yield misc Plant culture Development of a Critical Nitrogen Dilution Curve of Double Cropping Rice in South China
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topic_title	SB1-1110 Development of a Critical Nitrogen Dilution Curve of Double Cropping Rice in South China late rice early rice critical nitrogen dilution curve nitrogen nutrition index shoot biomass yield
topic	misc SB1-1110 misc late rice misc early rice misc critical nitrogen dilution curve misc nitrogen nutrition index misc shoot biomass misc yield misc Plant culture
topic_unstemmed	misc SB1-1110 misc late rice misc early rice misc critical nitrogen dilution curve misc nitrogen nutrition index misc shoot biomass misc yield misc Plant culture
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title	Development of a Critical Nitrogen Dilution Curve of Double Cropping Rice in South China
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title_full	Development of a Critical Nitrogen Dilution Curve of Double Cropping Rice in South China
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title_sort	development of a critical nitrogen dilution curve of double cropping rice in south china
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title_auth	Development of a Critical Nitrogen Dilution Curve of Double Cropping Rice in South China
abstract	The concept of critical nitrogen (Nc) concentration can be implemented to diagnose in-season plant nitrogen (N) status for optimizing N fertilizer management. The Nc dilution curves have been established for rice (Oryza sativa L.) grown in different climatic regions, yet no attempt has been made to develop the Nc dilution curve for double cropping rice regions. This study was undertaken to develop the Nc dilution curves for double cropping rice in south China for assessment of in-season N status and to establish the relationships N nutrition index (NNI) and relative yield (RY) for in-season prediction of rice grain yield. Three different N application rate field experiments using six Indica rice varieties, including two early rice hybrids and four late rice hybrids were carried out in east China. The Nc dilution curves based on whole plant N concentration were determined and described as, Nc = 3.37 W−0.44 for early rice and Nc = 3.69 W−0.34 for late rice. The constant N concentration at early growth stage was 3.31 and 3.15% DM for early and late rice, respectively. Late rice showed a higher capacity of N accumulation and a lower rate of N decline per unit shoot biomass as compared to early rice. The curves for present study were different from the existing reference curves for Indica and Japonica rice grown in different rice growing regions. Integrated N nutrition index (NNIint) based on Nc was used to estimate RY at different growth periods using linear regression functions. The results showed that the critical curves and relationship between NNIint and RY could be used as a reliable indicator of N status diagnosis, grain yield prediction as well as to provide technical support in N management for double cropping rice in south China.
abstractGer	The concept of critical nitrogen (Nc) concentration can be implemented to diagnose in-season plant nitrogen (N) status for optimizing N fertilizer management. The Nc dilution curves have been established for rice (Oryza sativa L.) grown in different climatic regions, yet no attempt has been made to develop the Nc dilution curve for double cropping rice regions. This study was undertaken to develop the Nc dilution curves for double cropping rice in south China for assessment of in-season N status and to establish the relationships N nutrition index (NNI) and relative yield (RY) for in-season prediction of rice grain yield. Three different N application rate field experiments using six Indica rice varieties, including two early rice hybrids and four late rice hybrids were carried out in east China. The Nc dilution curves based on whole plant N concentration were determined and described as, Nc = 3.37 W−0.44 for early rice and Nc = 3.69 W−0.34 for late rice. The constant N concentration at early growth stage was 3.31 and 3.15% DM for early and late rice, respectively. Late rice showed a higher capacity of N accumulation and a lower rate of N decline per unit shoot biomass as compared to early rice. The curves for present study were different from the existing reference curves for Indica and Japonica rice grown in different rice growing regions. Integrated N nutrition index (NNIint) based on Nc was used to estimate RY at different growth periods using linear regression functions. The results showed that the critical curves and relationship between NNIint and RY could be used as a reliable indicator of N status diagnosis, grain yield prediction as well as to provide technical support in N management for double cropping rice in south China.
abstract_unstemmed	The concept of critical nitrogen (Nc) concentration can be implemented to diagnose in-season plant nitrogen (N) status for optimizing N fertilizer management. The Nc dilution curves have been established for rice (Oryza sativa L.) grown in different climatic regions, yet no attempt has been made to develop the Nc dilution curve for double cropping rice regions. This study was undertaken to develop the Nc dilution curves for double cropping rice in south China for assessment of in-season N status and to establish the relationships N nutrition index (NNI) and relative yield (RY) for in-season prediction of rice grain yield. Three different N application rate field experiments using six Indica rice varieties, including two early rice hybrids and four late rice hybrids were carried out in east China. The Nc dilution curves based on whole plant N concentration were determined and described as, Nc = 3.37 W−0.44 for early rice and Nc = 3.69 W−0.34 for late rice. The constant N concentration at early growth stage was 3.31 and 3.15% DM for early and late rice, respectively. Late rice showed a higher capacity of N accumulation and a lower rate of N decline per unit shoot biomass as compared to early rice. The curves for present study were different from the existing reference curves for Indica and Japonica rice grown in different rice growing regions. Integrated N nutrition index (NNIint) based on Nc was used to estimate RY at different growth periods using linear regression functions. The results showed that the critical curves and relationship between NNIint and RY could be used as a reliable indicator of N status diagnosis, grain yield prediction as well as to provide technical support in N management for double cropping rice in south China.
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title_short	Development of a Critical Nitrogen Dilution Curve of Double Cropping Rice in South China
url	https://doi.org/10.3389/fpls.2017.00638 https://doaj.org/article/7f5e6e806d1f459ea76eca1c39530639 http://journal.frontiersin.org/article/10.3389/fpls.2017.00638/full https://doaj.org/toc/1664-462X
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Late rice showed a higher capacity of N accumulation and a lower rate of N decline per unit shoot biomass as compared to early rice. The curves for present study were different from the existing reference curves for Indica and Japonica rice grown in different rice growing regions. Integrated N nutrition index (NNIint) based on Nc was used to estimate RY at different growth periods using linear regression functions. 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Development of a Critical Nitrogen Dilution Curve of Double Cropping Rice in South China

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