Initial growth of cassava plants cv. Mossoró under different water regimes

Autores

  • Domingos Ferreira de Mélo Neto Universidade Federal do Ceará
  • Daniel Gomes Coelho Universidade Federal de Viçosa
  • Moab Torres de Andrade Universidade Federal de Viçosa
  • Jandelson de Oliveira Alves Universidade Federal do Vale do São Francisco

DOI:

https://doi.org/10.18227/1982-8470ragro.v12i3.5155

Palavras-chave:

Biomass accumulation. Drought tolerance. Water deficit. Manihot esculenta Crantz. Irrigation management.

Resumo

The sprouting phase of cassava is critical for the establishment of the plant, with this phase being dependent on soil moisture. As such, this study evaluated the effect of different irrigation levels on the initial growth of cassava cv. Mossoró in semi-arid conditions. The experiment was conducted under completely randomized design conditions with 5 replications. The treatments in pots containing one plant per experimental unit consisted of 5 irrigation levels, 0, 25, 50, 75 and 100% of the reference evapotranspiration (ETo, mm day-1), which corresponded to totals for the experimental period of 11.20; 42.15; 73.09; 104.03 and 134.97 mm, respectively. At 30 days after planting, the number of leaves and stems, as well as the dry mass of the shoot and the root had increased sharply for irrigation levels up to 73.09 mm. For higher irrigation levels there was a tendency for plant growth stabilization; however, above 104.03 mm there was a decrease. Shoot and root dry mass ratio showed severe water stress at the 11.20 mm level, being more damaging to root growth. Plant height showed a positive linear trend as the level of irrigation was increased, as opposed to water use efficiency. Therefore, irrigation with 50% replacement of ETo (73.09 mm) provided the best conditions for early growth of cassava.

Biografia do Autor

Domingos Ferreira de Mélo Neto, Universidade Federal do Ceará

Estudante de Doutorado do Programa de Pós-Graduação em Agronomia (Fitotecnia), Departamento de Fitotecnia

Daniel Gomes Coelho, Universidade Federal de Viçosa

Estudante de Doutorado do Programa de Pós-Graduação em Ciências Agrárias (Fisiologia Vegetal), Departamento de Biologia Vegetal

Moab Torres de Andrade, Universidade Federal de Viçosa

Estudante de Doutorado do Programa de Pós-Graduação em Ciências Agrárias (Fisiologia Vegetal), Departamento de Biologia Vegetal

Jandelson de Oliveira Alves, Universidade Federal do Vale do São Francisco

Mestre em Agronomia (Produção Vegetal)

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Publicado

29/10/2018

Edição

Seção

Original Scientific Article