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Provedor de dados:  65
País:  Brazil
Título:  Actual evapotranspiration and crop coefficient of sweet orange during the initial development phase in the Rio Largo region, Alagoas
Autores:  Silva,Ricardo Barros
Souza,José Leonaldo de
Ferreira Júnior,Ricardo Araújo
Santos,Marcos Alex dos
Souza,Renan Cantalice de
Santos,Wellington Manoel dos
Data:  2019-01-01
Ano:  2019
Palavras-chave:  Citrus sinensis (L.) Osbeck
Evapotranspiration reduction
Water balance.
Resumo:  ABSTRACT: Determining actual crop evapotranspiration (ETa) is paramount for irrigation management. The principal measurement methods and physical models generally require crop and weather data that are not readily available. We determined the crop coefficient (Kc) of sweet oranges during the initial development stage and evaluated the performance of the Poulovassilis semi-empirical model coupled with a simple soil water balance for estimating the ETa. The ETa was inferred from the variation in the soil water content over time, measured by time-domain reflectometry. In the Poulovassilis model, the ETa is obtained by multiplying the crop evapotranspiration (ETc) by an adjustment coefficient (ca), which accounts for a reduction in the evapotranspiration caused by soil water depletion. Soil water storage was obtained using the daily and 10-day soil water balances, computed by considering inputs and outputs of water from the system. The empirical parameter, ca, was determined using inverse modeling. The optimal ca value obtained through inverse modeling was 0.05 and 0.03 for the daily and 10-day soil water balances, respectively. The model performed better for the daily soil water balance than the 10-day balance, with performance comparable with the other ETa models. Average Kc during the sweet orange initial crop stage was 0.85.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000600202
Editor:  Universidade Federal de Santa Maria
Relação:  10.1590/0103-8478cr20180707
Formato:  text/html
Fonte:  Ciência Rural v.49 n.6 2019
Direitos:  info:eu-repo/semantics/openAccess
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