Supplementary irrigation in Sudan grass: Leaf area index, dry matter production and water use efficiency

Autores

  • Wellington Mezzomo Universidade Federal de Santa Maria http://orcid.org/0000-0002-1169-0620
  • Marcia Xavier Peiter Professora associada da Universidade Federal de Santa Maria
  • Adroaldo Dias Robaina Professor titular da Universidade Federal de Santa Maria
  • Jardel Henrique Kirchner Professor do Instituto Federal do Rio Grande do Sul
  • Rogério Ricalde Torres Professor do Instituto Federal do Rio Grande do Sul
  • Bruna Dalcin Pimenta Doutoranda na Universidade Federal de Santa Maria
  • Anderson Crestani Pereira Mestrando na Universidade Federal de Santa Maria
  • Luís Humberto Bahú Ben Universidade Federal de Santa Maria
  • Marcos Vinicius Loregian Mestrando na Universidade Federal de Santa Maria
  • Pablo Eanes Cocco Rodrigues Doutorando da Universidade Federal de Santa Maria

DOI:

https://doi.org/10.15361/1984-5529.2020v48n2p85-98

Resumo

The study was carried out in the municipality of Santiago, Rio Grande do Sul, Brazil, with the objective of evaluating the effect of the application of increasing supplementary irrigation depths on the leaf area index , dry matter  accumulation and water use efficiency of Sudan grass (Sorghum sudanense (Piper) Stapf) submitted to four standardization cuts of the aerial part, at 50, 80, 110 and 140 days after sowing (DAS) with irrigation depths of 60%, 80%, 100%, 120% and 140% of the difference between reference evapotranspiration (ETo) and effective precipitation-(EP), plus the control treatment (without irrigation: only EP). Between cuts, leaf area index and shoot dry mass were evaluated every fortnightly. The experimental design was in randomized blocks, with six treatments and four blocks, totaling 24 experimental units. Both the leaf area index and the dry mass production showed an increasing behavior until the treatment with 100% of ETo-EP; after this treatment the production was stable, with some of the highest averages in the treatment with 140% ETo-EP, and the lowest averages were observed in the treatment without irrigation. There was a decrease in dry mass production throughout the experiment due to the natural loss of the yield potential of the crop. At second cut (80 DAS), the leaf area index showed the highest values. The highest water use efficiency in the sum of the four cuts was in the treatment with 100% of ETo-EP and the lowest in the treatment with 60% of ETo-EP.

Biografia do Autor

Wellington Mezzomo, Universidade Federal de Santa Maria

Doutorando no Programa de Pós Graduação em Engenharia Agrícola, Departamento de Engenharia Rural, área de concentração Engenharia de Água e Solo, Laboratório de Engenharia de Irrigação.

Marcia Xavier Peiter, Professora associada da Universidade Federal de Santa Maria

Departamento engenharia rural, área engenharia agrícola

Adroaldo Dias Robaina, Professor titular da Universidade Federal de Santa Maria

Departamento engenharia rural, área engenharia agrícola

Bruna Dalcin Pimenta, Doutoranda na Universidade Federal de Santa Maria

Departamento engenharia rural, área engenharia agrícola

Anderson Crestani Pereira, Mestrando na Universidade Federal de Santa Maria

Departamento engenharia rural, área engenharia agrícola

Luís Humberto Bahú Ben, Universidade Federal de Santa Maria

Departamento engenharia rural, área engenharia agrícola

Marcos Vinicius Loregian, Mestrando na Universidade Federal de Santa Maria

Departamento da fitotecnia, área experimentação agrícola

Publicado

29/06/2020

Edição

Seção

Irrigação e Drenagem