Improved modeling of maize canopy water loss : case study in Brazil

Detalhes bibliográficos
Autor(a) principal: Santos, Antonio Odair
Data de Publicação: 2000
Outros Autores: Bergamaschi, Homero, Bergonci, Joao Ito, Rosa, Luis Mauro Gonçalves
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/77262
Resumo: The precise determination of water loss from plant canopies is important for monitoring crop water usage and for many agricultural management operations related to water use planning. The aim of this study was to estimate water loss from sunlit and shaded fractions of a maize (Zea mays L.) canopy, under wellwatered conditions, using the Penman-Monteith energy balance equation. Estimated values were validated by a heat pulse system, which was used to measure stem sap flow and by a weighing lysimeter. Water loss was corrected to account for the effect of row structure in the early stages of maize. Results showed that estimated transpiration of the shaded canopy ranged from 30% to 45% for total transpiration, under fluctuation of atmospheric demand. Hourly and daily estimations of transpiration showed good agreement with lysimeter and heat pulse measurements.
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spelling Santos, Antonio OdairBergamaschi, HomeroBergonci, Joao ItoRosa, Luis Mauro Gonçalves2013-08-23T01:46:36Z2000http://hdl.handle.net/10183/77262000294813The precise determination of water loss from plant canopies is important for monitoring crop water usage and for many agricultural management operations related to water use planning. The aim of this study was to estimate water loss from sunlit and shaded fractions of a maize (Zea mays L.) canopy, under wellwatered conditions, using the Penman-Monteith energy balance equation. Estimated values were validated by a heat pulse system, which was used to measure stem sap flow and by a weighing lysimeter. Water loss was corrected to account for the effect of row structure in the early stages of maize. Results showed that estimated transpiration of the shaded canopy ranged from 30% to 45% for total transpiration, under fluctuation of atmospheric demand. Hourly and daily estimations of transpiration showed good agreement with lysimeter and heat pulse measurements.La determinación exacta de la pérdida de agua por el canopeo de las plantas es importante para conocer el consumo de agua por los cultivos y para muchas actividades agrícolas relacionadas con la planificación del uso de agua. El objetivo de este estudio fue estimar la pérdida de agua del canopeo del maíz expuesto al sol y parcialmente sombreado, sin restricciones hídricas. Para ello se utilizó la ecuación del balance de energía de Penman-Monteith. Las estimaciones obtenidas fueron validadas por un sistema de pulsos de calor, el cual fue usado para medir el flujo de savia del tallo, y por un lisímetro de pesadas. La pérdida de agua fue corregida para considerar el efecto del surco en los estadios juveniles del maíz. Los resultados logrados mostraron que la transpiración del canopeo sombreado oscilaba entre el 30 y 45 % del total transpirado considerando las fluctuaciones de la demanda atmosf érica. Las estimaciones horarias y diarias de la transpiración presentaron una buena relación con las mediciones del lisímetro y los pulsos de calor.application/pdfengAgriscientia. Cordoba. Vol. 17 (2000), p. 11-19MilhoRelação água-plantaTranspiracao vegetalIrrigaçãoModelingTranspirationIrrigationMaizeModeloPulso de calorIrrigaciónImproved modeling of maize canopy water loss : case study in BrazilModelo de simulación mejorado de la pérdida de agua por el canopeo del maíz : un estudio piloto para BrasilEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000294813.pdf000294813.pdfTexto completo (inglês)application/pdf392870http://www.lume.ufrgs.br/bitstream/10183/77262/1/000294813.pdf37f925db5db5ee6fe2d7155306ce58e1MD51TEXT000294813.pdf.txt000294813.pdf.txtExtracted Texttext/plain28422http://www.lume.ufrgs.br/bitstream/10183/77262/2/000294813.pdf.txt4c28d7076207a1b699a054f04af97541MD52THUMBNAIL000294813.pdf.jpg000294813.pdf.jpgGenerated Thumbnailimage/jpeg1486http://www.lume.ufrgs.br/bitstream/10183/77262/3/000294813.pdf.jpg550f1a3f2a5af2cb5b2145e38e154cb3MD5310183/772622022-02-22 05:08:19.584946oai:www.lume.ufrgs.br:10183/77262Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2022-02-22T08:08:19Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Improved modeling of maize canopy water loss : case study in Brazil
dc.title.alternative.es.fl_str_mv Modelo de simulación mejorado de la pérdida de agua por el canopeo del maíz : un estudio piloto para Brasil
title Improved modeling of maize canopy water loss : case study in Brazil
spellingShingle Improved modeling of maize canopy water loss : case study in Brazil
Santos, Antonio Odair
Milho
Relação água-planta
Transpiracao vegetal
Irrigação
Modeling
Transpiration
Irrigation
Maize
Modelo
Pulso de calor
Irrigación
title_short Improved modeling of maize canopy water loss : case study in Brazil
title_full Improved modeling of maize canopy water loss : case study in Brazil
title_fullStr Improved modeling of maize canopy water loss : case study in Brazil
title_full_unstemmed Improved modeling of maize canopy water loss : case study in Brazil
title_sort Improved modeling of maize canopy water loss : case study in Brazil
author Santos, Antonio Odair
author_facet Santos, Antonio Odair
Bergamaschi, Homero
Bergonci, Joao Ito
Rosa, Luis Mauro Gonçalves
author_role author
author2 Bergamaschi, Homero
Bergonci, Joao Ito
Rosa, Luis Mauro Gonçalves
author2_role author
author
author
dc.contributor.author.fl_str_mv Santos, Antonio Odair
Bergamaschi, Homero
Bergonci, Joao Ito
Rosa, Luis Mauro Gonçalves
dc.subject.por.fl_str_mv Milho
Relação água-planta
Transpiracao vegetal
Irrigação
topic Milho
Relação água-planta
Transpiracao vegetal
Irrigação
Modeling
Transpiration
Irrigation
Maize
Modelo
Pulso de calor
Irrigación
dc.subject.eng.fl_str_mv Modeling
Transpiration
Irrigation
Maize
dc.subject.spa.fl_str_mv Modelo
Pulso de calor
Irrigación
description The precise determination of water loss from plant canopies is important for monitoring crop water usage and for many agricultural management operations related to water use planning. The aim of this study was to estimate water loss from sunlit and shaded fractions of a maize (Zea mays L.) canopy, under wellwatered conditions, using the Penman-Monteith energy balance equation. Estimated values were validated by a heat pulse system, which was used to measure stem sap flow and by a weighing lysimeter. Water loss was corrected to account for the effect of row structure in the early stages of maize. Results showed that estimated transpiration of the shaded canopy ranged from 30% to 45% for total transpiration, under fluctuation of atmospheric demand. Hourly and daily estimations of transpiration showed good agreement with lysimeter and heat pulse measurements.
publishDate 2000
dc.date.issued.fl_str_mv 2000
dc.date.accessioned.fl_str_mv 2013-08-23T01:46:36Z
dc.type.driver.fl_str_mv Estrangeiro
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dc.relation.ispartof.pt_BR.fl_str_mv Agriscientia. Cordoba. Vol. 17 (2000), p. 11-19
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