Watermelon evapotranspiration and crop coefficient in Teresina microregion - Piaui, Brazil

  • Valber Mendes Ferreira Universidade Estadual Paulista Júlio de Mesquita Filho-UNESP/SP
  • Antonio Evaldo Klar Prof. Titular - Depto. Eng. Rural, FCA, Botucatu-SP
  • Aderson Soares Andrade Júnior Embrapa Meio Norte, Teresina, PI
  • Edson Alves Bastos Embrapa Meio Norte, Teresina, PI
  • Simone Raquel Mendes Oliveira Colégio Técnico de Teresina, Universidade Federal do Piauí

Abstract

The determination of crop coefficient (Kc) values during the crop development cycle is essential to obtain the water requirements for the culture. The present study aimed to determine the evapotraspiration and Kc on Shadow, Top Gun and Crimson Sweet watermelon cultivars, during different stages of development using the method of soil water balance. The experiment was conducted at Embrapa Meio Norte in Teresina, PI, experimental field, from August to October, 2010. The evapotranspiration reference was estimated by Penman-Monteith, based on meteorological data obtained by an automatic weather station. According to the results, the ETc was 224.4 mm, corresponding to an average of 3.8 mm day-1. The higher water demand was 5.5 mm day-1, obtained at the intermediate phenological stage. The Kc values were 0.39, 0.80, 1.14, 0.59 (Crimson Sweet), 0.35, 0.72, 1.20, 0.30 (Top gun) and 0.34, 0.58, 0.89, 0.55 (Shadow), for initial, growth, intermediate and final phases, respectively.

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Author Biographies

Valber Mendes Ferreira, Universidade Estadual Paulista Júlio de Mesquita Filho-UNESP/SP
Possui graduação em Agronomia pela UFPI, Mestrado em Agronomia pela UFPI e Doutorado em Irrigação e Drenagem pela UNESP
Antonio Evaldo Klar, Prof. Titular - Depto. Eng. Rural, FCA, Botucatu-SP
Prof. Titular - Depto. Eng. Rural, FCA, Botucatu-SP

Aderson Soares Andrade Júnior, Embrapa Meio Norte, Teresina, PI
Embrapa Meio Norte, Teresina, PI
Edson Alves Bastos, Embrapa Meio Norte, Teresina, PI
Embrapa Meio Norte, Teresina, PI
Simone Raquel Mendes Oliveira, Colégio Técnico de Teresina, Universidade Federal do Piauí
Doutora em Engenharia Agrícola, Professora do Colégio Técnico de Teresina da Universidade federal do Piauí.
Published
29-12-2015
How to Cite
Ferreira, V. M., Klar, A. E., Andrade Júnior, A. S., Bastos, E. A., & Oliveira, S. R. M. (2015). Watermelon evapotranspiration and crop coefficient in Teresina microregion - Piaui, Brazil. Comunicata Scientiae, 6(4), 488-494. https://doi.org/10.14295/cs.v6i4.609
Section
Original Article