Thermal time in sprinkler-irrigated lowland rice

Authors

  • Alex Cristiano Bartz Universidade Federal do Pampa, Rua Luiz Joaquim de Sá Britto, s/no, Promorar, CEP 97650-000 Itaqui, RS.
  • Martina Muttoni Universidade Federal do Pampa, Rua Luiz Joaquim de Sá Britto, s/no, Promorar, CEP 97650-000 Itaqui, RS.
  • Cleber Maus Alberto Universidade Federal do Pampa, Rua Luiz Joaquim de Sá Britto, s/no, Promorar, CEP 97650-000 Itaqui, RS.
  • Nereu Augusto Streck Universidade Federal de Santa Maria, Avenida Roraima, no 1.000, Camobi, CEP 97105-900 Santa Maria, RS.
  • Géter Alves Machado Universidade Federal do Pampa, Rua Luiz Joaquim de Sá Britto, s/no, Promorar, CEP 97650-000 Itaqui, RS.
  • Robson Giacomeli Universidade Federal do Pampa, Rua Luiz Joaquim de Sá Britto, s/no, Promorar, CEP 97650-000 Itaqui, RS.
  • Diogo Balbé Helgueira Universidade Federal de Pelotas, Campus Universitário, s/no, CEP 96010-610 Capão do Leão, RS.
  • Diogo da Silva Moura Universidade Federal de Pelotas, Campus Universitário, s/no, CEP 96010-610 Capão do Leão, RS.

DOI:

https://doi.org/10.1590/S1678-3921.pab2017.v52.23857

Keywords:

Oryza sativa, degree-day, irrigation water depth, phenology, water availability

Abstract

The objective of this work was to evaluate methods of thermal time calculation and the duration of the development stages of lowland rice (Oryza sativa) irrigated by sprinkling. The experiment was conducted during three growing seasons (2010/2011, 2011/2012, and 2014/2015), with five irrigation water depths, six cultivars, and four replicates. Six methods of thermal time calculation were tested: two using the minimum basal temperature; two using the minimum and optimum temperatures; and two using the minimum, optimum, and maximum basal temperatures. For the thermal time calculation, the crop development cycle was divided into the vegetative, reproductive, and grain-filling phases. The methods that used the three cardinal temperatures showed the lowest coefficients of variation for most of the developmental phases. Both irrigation water depths and rice cultivars affected the thermal time of the development stages. The greater the water availability, the lower the duration of the development cycle. Thermal time values depend on the calculation method.

Author Biographies

Alex Cristiano Bartz, Universidade Federal do Pampa, Rua Luiz Joaquim de Sá Britto, s/no, Promorar, CEP 97650-000 Itaqui, RS.

http://lattes.cnpq.br/3028705184260604

Martina Muttoni, Universidade Federal do Pampa, Rua Luiz Joaquim de Sá Britto, s/no, Promorar, CEP 97650-000 Itaqui, RS.

http://lattes.cnpq.br/4498354781089037

Cleber Maus Alberto, Universidade Federal do Pampa, Rua Luiz Joaquim de Sá Britto, s/no, Promorar, CEP 97650-000 Itaqui, RS.

http://lattes.cnpq.br/2747295128900648

Nereu Augusto Streck, Universidade Federal de Santa Maria, Avenida Roraima, no 1.000, Camobi, CEP 97105-900 Santa Maria, RS.

http://lattes.cnpq.br/8121082379157248

Géter Alves Machado, Universidade Federal do Pampa, Rua Luiz Joaquim de Sá Britto, s/no, Promorar, CEP 97650-000 Itaqui, RS.

http://lattes.cnpq.br/8541790020070784

Robson Giacomeli, Universidade Federal do Pampa, Rua Luiz Joaquim de Sá Britto, s/no, Promorar, CEP 97650-000 Itaqui, RS.

http://lattes.cnpq.br/2361134063710575

Diogo Balbé Helgueira, Universidade Federal de Pelotas, Campus Universitário, s/no, CEP 96010-610 Capão do Leão, RS.

http://lattes.cnpq.br/0908651654173829

Diogo da Silva Moura, Universidade Federal de Pelotas, Campus Universitário, s/no, CEP 96010-610 Capão do Leão, RS.

http://lattes.cnpq.br/9310744543659819

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Published

2017-07-20

How to Cite

Bartz, A. C., Muttoni, M., Alberto, C. M., Streck, N. A., Machado, G. A., Giacomeli, R., … Moura, D. da S. (2017). Thermal time in sprinkler-irrigated lowland rice. Pesquisa Agropecuaria Brasileira, 52(7), 475–484. https://doi.org/10.1590/S1678-3921.pab2017.v52.23857

Issue

v.52, n.7, jul. 2017

Section

AGROMETEOROLOGY