Reference evapotranspiration based on temperature in Minas Gerais state, Brazil

ABSTRACT In the last decades, the areas of irrigated crops in the state of Minas Gerais have grown considerably, contributing to increase agricultural production in the country. Among the techniques of irrigation management, the determination of the water consumption by the plants is based on the re...

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Bibliographic Details
Published in:Ciência e agrotecnologia 2019, Vol.43
Main Authors: Pinheiro, Marcus André Braido, Oliveira, Aline Lílian Marques, Borges Júnior, João Carlos Ferreira, Oliveira, Evandro Chaves de, Carvalho, Luiz Gonsaga de
Format: Article
Language:English
Subjects:
AGRICULTURE, MULTIDISCIPLINARY
Hargreaves-Samani
Mean Absolute Error
Penman-Monteith-FAO
Water resources management
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Summary:ABSTRACT In the last decades, the areas of irrigated crops in the state of Minas Gerais have grown considerably, contributing to increase agricultural production in the country. Among the techniques of irrigation management, the determination of the water consumption by the plants is based on the reference evapotranspiration (ET0), the objective of this work was to evaluate and calibrate the Hargreaves-Samani (HS) method and a Proposed Method (MP) against the standard Penman-Monteith-FAO method (PM-FAO) for the state of Minas Gerais. For that, data from 52 conventional meteorological stations of the National Institute of Meteorology (INMET) were used. ET0 was estimated by the methods cited including the Hargreaves-Samani calibrated method (HScal) based on the mean absolute error (MAE). The analysis of the methods was carried out using the following statistical indicators: root mean square error (RMSE), systematic root mean square error (RMSEs), unsystematic root mean square error (RMSEun), the proportions of systematic and unsystematic mean square error, Willmott’s concordance index (d), confidence index (C) and Pearson correlation coefficient (r). It was verified that after the calibration, the HScal method obtained a superior performance to the original HS method in all the studied stations. It was also observed a superior MP performance with respect to the HScal method, in all stations studied. RESUMO Nas últimas décadas, as áreas de cultivos irrigados no estado de Minas Gerais vêm crescendo bastante, contribuindo assim para aumento da produção agrícola no País. Dentre as técnicas de manejo da irrigação, tem-se a determinação do consumo de água pelas plantas tomando por base a evapotranspiração de referência (ET0), diante disso, objetivou-se com este trabalho, avaliar e calibrar o método Hargreaves-Samani (HS) e um Método Proposto (MP) frente ao método padrão Penman-Monteith-FAO (PM-FAO) para o estado de Minas Gerais. Para tanto, foram utilizados dados de 52 estações meteorológicas convencionais do Instituto Nacional de Meteorologia (INMET). Estimou-se a ET0 pelos métodos citados incluindo o método Hargreaves-Samani calibrado (HScal). com base no erro absoluto médio (EAM). A análise dos métodos foi conduzida mediante aos seguintes indicadores estatísticos: raiz quadrada do erro quadrático médio (REQM), raiz quadrada do erro quadrático médio sistemático (REQMs), raiz quadrada do erro quadrático médio não sistemático (REQMns), proporções do erro quadrátic
ISSN:1413-7054
1981-1829
1981-1829
DOI:10.1590/1413-7054201943004219