Production and nutrition of irrigated Tanzania guinea grass in response to nitrogen fertilization

The objective of this study was to evaluate the effects of nitrogen (N) fertilization in the four seasons of the year on forage production, nitrate (NO3) in the sap, total N in the forage and relative chlorophyll index (SPAD reading) in the leaves of irrigated Panicum maximum cv. Tanzania grass, est...
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Gespeichert in:

Autor*in:	Maria Celuta Machado Viana [verfasserIn] Inêz Pereira da Silva [verfasserIn] Francisco Morel Freire [verfasserIn] Mozart Martins Ferreira [verfasserIn] Édio Luiz da Costa [verfasserIn] Maria Helena Tabim Mascarenhas [verfasserIn] Matheus Ferreira França Teixeira [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch ; Spanisch ; Portugiesisch

Erschienen:	2014

Schlagwörter:	chlorophyll NO3 in the sap Panicum maximum SPAD total N content

Übergeordnetes Werk:	In: Revista Brasileira de Zootecnia - Sociedade Brasileira de Zootecnia, 2004, 43(2014), 5, Seite 238-243
Übergeordnetes Werk:	volume:43 ; year:2014 ; number:5 ; pages:238-243

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.1590/S1516-35982014000500003

Katalog-ID:	DOAJ052310876

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allfields	10.1590/S1516-35982014000500003 doi (DE-627)DOAJ052310876 (DE-599)DOAJ556353d7663341e9bacdc70a18b56ba9 DE-627 ger DE-627 rakwb eng spa por SF1-1100 Maria Celuta Machado Viana verfasserin aut Production and nutrition of irrigated Tanzania guinea grass in response to nitrogen fertilization 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The objective of this study was to evaluate the effects of nitrogen (N) fertilization in the four seasons of the year on forage production, nitrate (NO3) in the sap, total N in the forage and relative chlorophyll index (SPAD reading) in the leaves of irrigated Panicum maximum cv. Tanzania grass, establishing their critical ranges. In addition, we evaluated the ability to predict forage production based on NO3 in the sap, total N in the forage and relative chlorophyll index. The soil in the experimental area was classified as an Oxisol (Red-Yellow Latosol) with a clayey texture. Annual rates of N (0, 200, 400 and 800 kg ha-1) in the form of urea were the treatments tested. Irrigation was performed through a conventional spray system. The NO3 content in the sap and the relative chlorophyll index were measured in leaves using a portable meter with NO3 selective electrode and the SPAD-502 portable chlorophyll meter device, respectively. Tanzania guinea grass was very responsive to N fertilization, except in the winter. The critical ranges of the SPAD reading proved to be more adequate for monitoring the nutritional state of N of Tanzania guinea grass in the different seasons of the year than the NO3content in the sap and the total N content in the dry matter. Use of the chlorophyll meter is more advantageous than the use of the portable meter with an nitrate selective electrode for predicting the nutritional status of Tanzania guinea grass. chlorophyll NO3 in the sap Panicum maximum SPAD total N content Animal culture Inêz Pereira da Silva verfasserin aut Francisco Morel Freire verfasserin aut Mozart Martins Ferreira verfasserin aut Édio Luiz da Costa verfasserin aut Maria Helena Tabim Mascarenhas verfasserin aut Matheus Ferreira França Teixeira verfasserin aut In Revista Brasileira de Zootecnia Sociedade Brasileira de Zootecnia, 2004 43(2014), 5, Seite 238-243 (DE-627)347753302 (DE-600)2078814-9 18069290 nnns volume:43 year:2014 number:5 pages:238-243 https://doi.org/10.1590/S1516-35982014000500003 kostenfrei https://doaj.org/article/556353d7663341e9bacdc70a18b56ba9 kostenfrei http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000500238&lng=en&tlng=en kostenfrei https://doaj.org/toc/1806-9290 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 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_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 43 2014 5 238-243
spelling	10.1590/S1516-35982014000500003 doi (DE-627)DOAJ052310876 (DE-599)DOAJ556353d7663341e9bacdc70a18b56ba9 DE-627 ger DE-627 rakwb eng spa por SF1-1100 Maria Celuta Machado Viana verfasserin aut Production and nutrition of irrigated Tanzania guinea grass in response to nitrogen fertilization 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The objective of this study was to evaluate the effects of nitrogen (N) fertilization in the four seasons of the year on forage production, nitrate (NO3) in the sap, total N in the forage and relative chlorophyll index (SPAD reading) in the leaves of irrigated Panicum maximum cv. Tanzania grass, establishing their critical ranges. In addition, we evaluated the ability to predict forage production based on NO3 in the sap, total N in the forage and relative chlorophyll index. The soil in the experimental area was classified as an Oxisol (Red-Yellow Latosol) with a clayey texture. Annual rates of N (0, 200, 400 and 800 kg ha-1) in the form of urea were the treatments tested. Irrigation was performed through a conventional spray system. The NO3 content in the sap and the relative chlorophyll index were measured in leaves using a portable meter with NO3 selective electrode and the SPAD-502 portable chlorophyll meter device, respectively. Tanzania guinea grass was very responsive to N fertilization, except in the winter. The critical ranges of the SPAD reading proved to be more adequate for monitoring the nutritional state of N of Tanzania guinea grass in the different seasons of the year than the NO3content in the sap and the total N content in the dry matter. Use of the chlorophyll meter is more advantageous than the use of the portable meter with an nitrate selective electrode for predicting the nutritional status of Tanzania guinea grass. chlorophyll NO3 in the sap Panicum maximum SPAD total N content Animal culture Inêz Pereira da Silva verfasserin aut Francisco Morel Freire verfasserin aut Mozart Martins Ferreira verfasserin aut Édio Luiz da Costa verfasserin aut Maria Helena Tabim Mascarenhas verfasserin aut Matheus Ferreira França Teixeira verfasserin aut In Revista Brasileira de Zootecnia Sociedade Brasileira de Zootecnia, 2004 43(2014), 5, Seite 238-243 (DE-627)347753302 (DE-600)2078814-9 18069290 nnns volume:43 year:2014 number:5 pages:238-243 https://doi.org/10.1590/S1516-35982014000500003 kostenfrei https://doaj.org/article/556353d7663341e9bacdc70a18b56ba9 kostenfrei http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000500238&lng=en&tlng=en kostenfrei https://doaj.org/toc/1806-9290 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 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_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 43 2014 5 238-243
allfields_unstemmed	10.1590/S1516-35982014000500003 doi (DE-627)DOAJ052310876 (DE-599)DOAJ556353d7663341e9bacdc70a18b56ba9 DE-627 ger DE-627 rakwb eng spa por SF1-1100 Maria Celuta Machado Viana verfasserin aut Production and nutrition of irrigated Tanzania guinea grass in response to nitrogen fertilization 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The objective of this study was to evaluate the effects of nitrogen (N) fertilization in the four seasons of the year on forage production, nitrate (NO3) in the sap, total N in the forage and relative chlorophyll index (SPAD reading) in the leaves of irrigated Panicum maximum cv. Tanzania grass, establishing their critical ranges. In addition, we evaluated the ability to predict forage production based on NO3 in the sap, total N in the forage and relative chlorophyll index. The soil in the experimental area was classified as an Oxisol (Red-Yellow Latosol) with a clayey texture. Annual rates of N (0, 200, 400 and 800 kg ha-1) in the form of urea were the treatments tested. Irrigation was performed through a conventional spray system. The NO3 content in the sap and the relative chlorophyll index were measured in leaves using a portable meter with NO3 selective electrode and the SPAD-502 portable chlorophyll meter device, respectively. Tanzania guinea grass was very responsive to N fertilization, except in the winter. The critical ranges of the SPAD reading proved to be more adequate for monitoring the nutritional state of N of Tanzania guinea grass in the different seasons of the year than the NO3content in the sap and the total N content in the dry matter. Use of the chlorophyll meter is more advantageous than the use of the portable meter with an nitrate selective electrode for predicting the nutritional status of Tanzania guinea grass. chlorophyll NO3 in the sap Panicum maximum SPAD total N content Animal culture Inêz Pereira da Silva verfasserin aut Francisco Morel Freire verfasserin aut Mozart Martins Ferreira verfasserin aut Édio Luiz da Costa verfasserin aut Maria Helena Tabim Mascarenhas verfasserin aut Matheus Ferreira França Teixeira verfasserin aut In Revista Brasileira de Zootecnia Sociedade Brasileira de Zootecnia, 2004 43(2014), 5, Seite 238-243 (DE-627)347753302 (DE-600)2078814-9 18069290 nnns volume:43 year:2014 number:5 pages:238-243 https://doi.org/10.1590/S1516-35982014000500003 kostenfrei https://doaj.org/article/556353d7663341e9bacdc70a18b56ba9 kostenfrei http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000500238&lng=en&tlng=en kostenfrei https://doaj.org/toc/1806-9290 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 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_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 43 2014 5 238-243
allfieldsGer	10.1590/S1516-35982014000500003 doi (DE-627)DOAJ052310876 (DE-599)DOAJ556353d7663341e9bacdc70a18b56ba9 DE-627 ger DE-627 rakwb eng spa por SF1-1100 Maria Celuta Machado Viana verfasserin aut Production and nutrition of irrigated Tanzania guinea grass in response to nitrogen fertilization 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The objective of this study was to evaluate the effects of nitrogen (N) fertilization in the four seasons of the year on forage production, nitrate (NO3) in the sap, total N in the forage and relative chlorophyll index (SPAD reading) in the leaves of irrigated Panicum maximum cv. Tanzania grass, establishing their critical ranges. In addition, we evaluated the ability to predict forage production based on NO3 in the sap, total N in the forage and relative chlorophyll index. The soil in the experimental area was classified as an Oxisol (Red-Yellow Latosol) with a clayey texture. Annual rates of N (0, 200, 400 and 800 kg ha-1) in the form of urea were the treatments tested. Irrigation was performed through a conventional spray system. The NO3 content in the sap and the relative chlorophyll index were measured in leaves using a portable meter with NO3 selective electrode and the SPAD-502 portable chlorophyll meter device, respectively. Tanzania guinea grass was very responsive to N fertilization, except in the winter. The critical ranges of the SPAD reading proved to be more adequate for monitoring the nutritional state of N of Tanzania guinea grass in the different seasons of the year than the NO3content in the sap and the total N content in the dry matter. Use of the chlorophyll meter is more advantageous than the use of the portable meter with an nitrate selective electrode for predicting the nutritional status of Tanzania guinea grass. chlorophyll NO3 in the sap Panicum maximum SPAD total N content Animal culture Inêz Pereira da Silva verfasserin aut Francisco Morel Freire verfasserin aut Mozart Martins Ferreira verfasserin aut Édio Luiz da Costa verfasserin aut Maria Helena Tabim Mascarenhas verfasserin aut Matheus Ferreira França Teixeira verfasserin aut In Revista Brasileira de Zootecnia Sociedade Brasileira de Zootecnia, 2004 43(2014), 5, Seite 238-243 (DE-627)347753302 (DE-600)2078814-9 18069290 nnns volume:43 year:2014 number:5 pages:238-243 https://doi.org/10.1590/S1516-35982014000500003 kostenfrei https://doaj.org/article/556353d7663341e9bacdc70a18b56ba9 kostenfrei http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000500238&lng=en&tlng=en kostenfrei https://doaj.org/toc/1806-9290 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 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_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 43 2014 5 238-243
allfieldsSound	10.1590/S1516-35982014000500003 doi (DE-627)DOAJ052310876 (DE-599)DOAJ556353d7663341e9bacdc70a18b56ba9 DE-627 ger DE-627 rakwb eng spa por SF1-1100 Maria Celuta Machado Viana verfasserin aut Production and nutrition of irrigated Tanzania guinea grass in response to nitrogen fertilization 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The objective of this study was to evaluate the effects of nitrogen (N) fertilization in the four seasons of the year on forage production, nitrate (NO3) in the sap, total N in the forage and relative chlorophyll index (SPAD reading) in the leaves of irrigated Panicum maximum cv. Tanzania grass, establishing their critical ranges. In addition, we evaluated the ability to predict forage production based on NO3 in the sap, total N in the forage and relative chlorophyll index. The soil in the experimental area was classified as an Oxisol (Red-Yellow Latosol) with a clayey texture. Annual rates of N (0, 200, 400 and 800 kg ha-1) in the form of urea were the treatments tested. Irrigation was performed through a conventional spray system. The NO3 content in the sap and the relative chlorophyll index were measured in leaves using a portable meter with NO3 selective electrode and the SPAD-502 portable chlorophyll meter device, respectively. Tanzania guinea grass was very responsive to N fertilization, except in the winter. The critical ranges of the SPAD reading proved to be more adequate for monitoring the nutritional state of N of Tanzania guinea grass in the different seasons of the year than the NO3content in the sap and the total N content in the dry matter. Use of the chlorophyll meter is more advantageous than the use of the portable meter with an nitrate selective electrode for predicting the nutritional status of Tanzania guinea grass. chlorophyll NO3 in the sap Panicum maximum SPAD total N content Animal culture Inêz Pereira da Silva verfasserin aut Francisco Morel Freire verfasserin aut Mozart Martins Ferreira verfasserin aut Édio Luiz da Costa verfasserin aut Maria Helena Tabim Mascarenhas verfasserin aut Matheus Ferreira França Teixeira verfasserin aut In Revista Brasileira de Zootecnia Sociedade Brasileira de Zootecnia, 2004 43(2014), 5, Seite 238-243 (DE-627)347753302 (DE-600)2078814-9 18069290 nnns volume:43 year:2014 number:5 pages:238-243 https://doi.org/10.1590/S1516-35982014000500003 kostenfrei https://doaj.org/article/556353d7663341e9bacdc70a18b56ba9 kostenfrei http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000500238&lng=en&tlng=en kostenfrei https://doaj.org/toc/1806-9290 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 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_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 43 2014 5 238-243
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callnumber-first	S - Agriculture
author	Maria Celuta Machado Viana
spellingShingle	Maria Celuta Machado Viana misc SF1-1100 misc chlorophyll misc NO3 in the sap misc Panicum maximum misc SPAD misc total N content misc Animal culture Production and nutrition of irrigated Tanzania guinea grass in response to nitrogen fertilization
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topic_title	SF1-1100 Production and nutrition of irrigated Tanzania guinea grass in response to nitrogen fertilization chlorophyll NO3 in the sap Panicum maximum SPAD total N content
topic	misc SF1-1100 misc chlorophyll misc NO3 in the sap misc Panicum maximum misc SPAD misc total N content misc Animal culture
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title	Production and nutrition of irrigated Tanzania guinea grass in response to nitrogen fertilization
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title_full	Production and nutrition of irrigated Tanzania guinea grass in response to nitrogen fertilization
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author_browse	Maria Celuta Machado Viana Inêz Pereira da Silva Francisco Morel Freire Mozart Martins Ferreira Édio Luiz da Costa Maria Helena Tabim Mascarenhas Matheus Ferreira França Teixeira
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title_sort	production and nutrition of irrigated tanzania guinea grass in response to nitrogen fertilization
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title_auth	Production and nutrition of irrigated Tanzania guinea grass in response to nitrogen fertilization
abstract	The objective of this study was to evaluate the effects of nitrogen (N) fertilization in the four seasons of the year on forage production, nitrate (NO3) in the sap, total N in the forage and relative chlorophyll index (SPAD reading) in the leaves of irrigated Panicum maximum cv. Tanzania grass, establishing their critical ranges. In addition, we evaluated the ability to predict forage production based on NO3 in the sap, total N in the forage and relative chlorophyll index. The soil in the experimental area was classified as an Oxisol (Red-Yellow Latosol) with a clayey texture. Annual rates of N (0, 200, 400 and 800 kg ha-1) in the form of urea were the treatments tested. Irrigation was performed through a conventional spray system. The NO3 content in the sap and the relative chlorophyll index were measured in leaves using a portable meter with NO3 selective electrode and the SPAD-502 portable chlorophyll meter device, respectively. Tanzania guinea grass was very responsive to N fertilization, except in the winter. The critical ranges of the SPAD reading proved to be more adequate for monitoring the nutritional state of N of Tanzania guinea grass in the different seasons of the year than the NO3content in the sap and the total N content in the dry matter. Use of the chlorophyll meter is more advantageous than the use of the portable meter with an nitrate selective electrode for predicting the nutritional status of Tanzania guinea grass.
abstractGer	The objective of this study was to evaluate the effects of nitrogen (N) fertilization in the four seasons of the year on forage production, nitrate (NO3) in the sap, total N in the forage and relative chlorophyll index (SPAD reading) in the leaves of irrigated Panicum maximum cv. Tanzania grass, establishing their critical ranges. In addition, we evaluated the ability to predict forage production based on NO3 in the sap, total N in the forage and relative chlorophyll index. The soil in the experimental area was classified as an Oxisol (Red-Yellow Latosol) with a clayey texture. Annual rates of N (0, 200, 400 and 800 kg ha-1) in the form of urea were the treatments tested. Irrigation was performed through a conventional spray system. The NO3 content in the sap and the relative chlorophyll index were measured in leaves using a portable meter with NO3 selective electrode and the SPAD-502 portable chlorophyll meter device, respectively. Tanzania guinea grass was very responsive to N fertilization, except in the winter. The critical ranges of the SPAD reading proved to be more adequate for monitoring the nutritional state of N of Tanzania guinea grass in the different seasons of the year than the NO3content in the sap and the total N content in the dry matter. Use of the chlorophyll meter is more advantageous than the use of the portable meter with an nitrate selective electrode for predicting the nutritional status of Tanzania guinea grass.
abstract_unstemmed	The objective of this study was to evaluate the effects of nitrogen (N) fertilization in the four seasons of the year on forage production, nitrate (NO3) in the sap, total N in the forage and relative chlorophyll index (SPAD reading) in the leaves of irrigated Panicum maximum cv. Tanzania grass, establishing their critical ranges. In addition, we evaluated the ability to predict forage production based on NO3 in the sap, total N in the forage and relative chlorophyll index. The soil in the experimental area was classified as an Oxisol (Red-Yellow Latosol) with a clayey texture. Annual rates of N (0, 200, 400 and 800 kg ha-1) in the form of urea were the treatments tested. Irrigation was performed through a conventional spray system. The NO3 content in the sap and the relative chlorophyll index were measured in leaves using a portable meter with NO3 selective electrode and the SPAD-502 portable chlorophyll meter device, respectively. Tanzania guinea grass was very responsive to N fertilization, except in the winter. The critical ranges of the SPAD reading proved to be more adequate for monitoring the nutritional state of N of Tanzania guinea grass in the different seasons of the year than the NO3content in the sap and the total N content in the dry matter. Use of the chlorophyll meter is more advantageous than the use of the portable meter with an nitrate selective electrode for predicting the nutritional status of Tanzania guinea grass.
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title_short	Production and nutrition of irrigated Tanzania guinea grass in response to nitrogen fertilization
url	https://doi.org/10.1590/S1516-35982014000500003 https://doaj.org/article/556353d7663341e9bacdc70a18b56ba9 http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000500238&lng=en&tlng=en https://doaj.org/toc/1806-9290
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author2	Inêz Pereira da Silva Francisco Morel Freire Mozart Martins Ferreira Édio Luiz da Costa Maria Helena Tabim Mascarenhas Matheus Ferreira França Teixeira
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Production and nutrition of irrigated Tanzania guinea grass in response to nitrogen fertilization

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