IRRIGAMETER USE FOR ESTIMATING CROP EVAPOTRANSPIRATION IN PROTECTED ENVIRONMENT

Authors

  • Lorena Júlio Gonçalves Laboratory of Agricultural Hydraulics and Irrigation and Drainage, Universidade Estadual do Sudoeste da Bahia, Vitória da Conquista, BA http://orcid.org/0000-0002-0793-9630
  • Cristiano Taglieferre Laboratory of Agricultural Hydraulics and Irrigation and Drainage, Universidade Estadual do Sudoeste da Bahia, Vitória da Conquista, BA http://orcid.org/0000-0003-4776-473X
  • Manoel Nelson de Castro Filho Laboratory of Agricultural Hydraulics and Irrigation and Drainage, Universidade Estadual do Sudoeste da Bahia, Vitória da Conquista, BA http://orcid.org/0000-0001-6783-9861
  • Diogo Ulisses Gomes Guimarães Agronomist Engineer, Vitória da Conquista, BA http://orcid.org/0000-0001-8706-4725
  • Felizardo Adenilson Rocha Department of Environmental Engineering, Instituto Federal da Bahia, Vitória da Conquista, BA http://orcid.org/0000-0001-6410-5176

DOI:

https://doi.org/10.1590/1983-21252019v32n322rc

Keywords:

Climatic variables. Irrigation management. Cowpea beans. Water Consumption.

Abstract

In the face of climatic adversities associated with water lacking for irrigation, crop cultivation in greenhouses in Brazil has increased significantly, thereby demanding research that makes it possible to estimate crop water demand when grown in these environments. Therefore, the objective of this study was to evaluate the performance of Irrigameters to estimate the evapotranspiration of cowpea grown in protected environment. The experiment was conducted in the experimental area of the State University of Southwest of Bahia (UESB) under protected environment and the cowpea variety used was BRS Guariba. For this study, two Irrigameters were installed for the direct estimation of the daily crop evapotranspiration. Likewise, with the use of an automatic weather, the meteorological data were collected and the crop evapotranspiration (ETc) was estimated using the Kc values recommended for different phases of the crop. The data collected by the Irrigameter were compared with the data estimated by the Penman-Monteith method, as well as with Radiation and Blaney Criddle methods at one-, two- and three-day intervals. The results show that all the methods were efficient and accurate at estimating ETc at all studied intervals.

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Published

27-08-2019

Issue

Section

Agricultural Engineering