Cotton water requirements

Detalhes bibliográficos
Autor(a) principal: de Azavedo, Pedro Vieira
Data de Publicação: 1993
Outros Autores: Rao, T. V. Ramana, Neto, Malaquias da Silva Amorin, Pereira, José Renato Cortez, Sobrinho, José Espínola, Maciel, Girlene Figueiredo
Tipo de documento: Artigo
Idioma: por
Título da fonte: Pesquisa Agropecuária Brasileira (Online)
Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/3948
Resumo: A field experiment with irrigated cotton was conducted at Sousa, PB, Brazil, in the period from August to December, 1990. Its objective was to measure daily maximum crop evapotranspiration (ETm) and reference potential evapotranspiration (ETo), estimated by climatological methods, in order to establish the seasonal behaviour of the crop coefficient (Kc = ETm/ETo). A 0.7 ha plot was planted in a 1.00 m row and 0.20 m between plant spacing. Irrigation was made by furrows. The meteorological parameters were daily observed above the canopy. The maximum daily water consumption occurred in the tenth week (ETm = 6.4 mm/day) and the seasonal total water consumption of 440.0 mm. ETo showed a tendency for overestimating ETm in the phases of germination and vegetative growth and for underestimating it in the period of full crop development. The methods of estimation of ETo showed statistically no significant differences, with Penman's method showing the lowest difference in relation to those values suggested by FAO. Kc values showed good agreement with those suggested by FAO. A Kc characteristic curve was established for the crop growing season. The crop showed a low transpiration rate even in excellent soil water conditions.
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spelling Cotton water requirementsNecessidades hídricas da cultura do algodoeiroevapotranspiration; water consumption; crop coefficient; growing seasonevapotranspiração; consumo hídrico; coeficiente de cultivo; ciclo vegetativoA field experiment with irrigated cotton was conducted at Sousa, PB, Brazil, in the period from August to December, 1990. Its objective was to measure daily maximum crop evapotranspiration (ETm) and reference potential evapotranspiration (ETo), estimated by climatological methods, in order to establish the seasonal behaviour of the crop coefficient (Kc = ETm/ETo). A 0.7 ha plot was planted in a 1.00 m row and 0.20 m between plant spacing. Irrigation was made by furrows. The meteorological parameters were daily observed above the canopy. The maximum daily water consumption occurred in the tenth week (ETm = 6.4 mm/day) and the seasonal total water consumption of 440.0 mm. ETo showed a tendency for overestimating ETm in the phases of germination and vegetative growth and for underestimating it in the period of full crop development. The methods of estimation of ETo showed statistically no significant differences, with Penman's method showing the lowest difference in relation to those values suggested by FAO. Kc values showed good agreement with those suggested by FAO. A Kc characteristic curve was established for the crop growing season. The crop showed a low transpiration rate even in excellent soil water conditions.Um experimento com algodão herbáceo irrigado foi conduzido em Sousa-PB, no período de agosto a dezembro de 1990. Objetivou o monitoramento diário da evapotranspiração máxima medida (ETm) e o potencial de referência (ETo), estimados por métodos climatológicos, visando estabelecer o comportamento estacional do coeficiente de cultivo (Kc = ETm/ETo). Uma parcela de 0,7 ha foi semeada num espaçamento de 1,00 m entre fileiras e 0,20 m entre covas. As irrigações foram efetuadas por sulcos. Os parâmetros meteorológicos foram monitorados diariamente sobre a vegetação. O consumo hídrico diário foi máximo na décima semana (ETm = 6,4 mm/dia) e totalizou 440,0 mm no ciclo vegetativo. ETo mostrou uma tendência para sobrestimar ETm nos subperíodos de germinação e crescimento vegetativo, e subestimá-la após o completo desenvolvimento da cultura. Os métodos de estimativa de ETo apresentaram diferenças estatisticamente não significativas. O método de Penman indicou as menores diferenças em relação aos valores da FAO. Os valores de Kc mostraram-se bastante consistentes com os sugeridos pela FAO. Determinou-se uma curva característica para o ciclo vegetativo da cultura. Observou-se uma baixa taxa transpiratória da cultura, mesmo em ótimas condições de umidade no solo.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária Brasileirade Azavedo, Pedro VieiraRao, T. V. RamanaNeto, Malaquias da Silva AmorinPereira, José Renato CortezSobrinho, José EspínolaMaciel, Girlene Figueiredo1993-07-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/3948Pesquisa Agropecuaria Brasileira; v.28, n.7, jul. 1993; 863-870Pesquisa Agropecuária Brasileira; v.28, n.7, jul. 1993; 863-8701678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/3948/1239info:eu-repo/semantics/openAccess2011-08-23T15:05:50Zoai:ojs.seer.sct.embrapa.br:article/3948Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2011-08-23T15:05:50Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Cotton water requirements
Necessidades hídricas da cultura do algodoeiro
title Cotton water requirements
spellingShingle Cotton water requirements
de Azavedo, Pedro Vieira
evapotranspiration; water consumption; crop coefficient; growing season
evapotranspiração; consumo hídrico; coeficiente de cultivo; ciclo vegetativo
title_short Cotton water requirements
title_full Cotton water requirements
title_fullStr Cotton water requirements
title_full_unstemmed Cotton water requirements
title_sort Cotton water requirements
author de Azavedo, Pedro Vieira
author_facet de Azavedo, Pedro Vieira
Rao, T. V. Ramana
Neto, Malaquias da Silva Amorin
Pereira, José Renato Cortez
Sobrinho, José Espínola
Maciel, Girlene Figueiredo
author_role author
author2 Rao, T. V. Ramana
Neto, Malaquias da Silva Amorin
Pereira, José Renato Cortez
Sobrinho, José Espínola
Maciel, Girlene Figueiredo
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv

dc.contributor.author.fl_str_mv de Azavedo, Pedro Vieira
Rao, T. V. Ramana
Neto, Malaquias da Silva Amorin
Pereira, José Renato Cortez
Sobrinho, José Espínola
Maciel, Girlene Figueiredo
dc.subject.por.fl_str_mv evapotranspiration; water consumption; crop coefficient; growing season
evapotranspiração; consumo hídrico; coeficiente de cultivo; ciclo vegetativo
topic evapotranspiration; water consumption; crop coefficient; growing season
evapotranspiração; consumo hídrico; coeficiente de cultivo; ciclo vegetativo
description A field experiment with irrigated cotton was conducted at Sousa, PB, Brazil, in the period from August to December, 1990. Its objective was to measure daily maximum crop evapotranspiration (ETm) and reference potential evapotranspiration (ETo), estimated by climatological methods, in order to establish the seasonal behaviour of the crop coefficient (Kc = ETm/ETo). A 0.7 ha plot was planted in a 1.00 m row and 0.20 m between plant spacing. Irrigation was made by furrows. The meteorological parameters were daily observed above the canopy. The maximum daily water consumption occurred in the tenth week (ETm = 6.4 mm/day) and the seasonal total water consumption of 440.0 mm. ETo showed a tendency for overestimating ETm in the phases of germination and vegetative growth and for underestimating it in the period of full crop development. The methods of estimation of ETo showed statistically no significant differences, with Penman's method showing the lowest difference in relation to those values suggested by FAO. Kc values showed good agreement with those suggested by FAO. A Kc characteristic curve was established for the crop growing season. The crop showed a low transpiration rate even in excellent soil water conditions.
publishDate 1993
dc.date.none.fl_str_mv 1993-07-01
dc.type.none.fl_str_mv
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/3948
url https://seer.sct.embrapa.br/index.php/pab/article/view/3948
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/3948/1239
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
dc.source.none.fl_str_mv Pesquisa Agropecuaria Brasileira; v.28, n.7, jul. 1993; 863-870
Pesquisa Agropecuária Brasileira; v.28, n.7, jul. 1993; 863-870
1678-3921
0100-104x
reponame:Pesquisa Agropecuária Brasileira (Online)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
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reponame_str Pesquisa Agropecuária Brasileira (Online)
collection Pesquisa Agropecuária Brasileira (Online)
repository.name.fl_str_mv Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv pab@sct.embrapa.br || sct.pab@embrapa.br
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