Yield and morphophysiological indices of irrigated rice genotypes in contrasting ecosystems

Authors

  • Marcos Paulo dos Santos Federal University of Goiás image/svg+xml
  • Alencar Junior Zanon Instituto Rio Grandense do Arroz - IRGA
  • Santiago Vianna Cuadra Embrapa Clima Temperado
  • Silvio Steinmetz Embrapa Clima Temperado
  • João Rodrigo de Castro Federal University of Goiás image/svg+xml
  • Alexandre Bryan Heinemann Embrapa Arroz e Feijão, Santo Antônio de Goiás, GO

DOI:

https://doi.org/10.5216/pat.v47i3.45955

Keywords:

Oryza sativa L., ecophysiology, sowing date, solar radiation.

Abstract

Rice phenology and development are events controlled by environmental and genetic factors, and the yield potential of the crop is defined by their interaction. This study aimed at analyzing the performance of irrigated rice genotypes in contrasting ecosystems and their effects on morphophysiological characteristics. Two ecosystems (tropical and subtropical) were analyzed, as well as cultivars recommended for tropical (BRS Catiana and BRS Jaçanã) and subtropical (BRS Pampa, BRS 7 Taim and IRGA 424) regions. The experiments were arranged in a complete randomized block design, with four replicates, being the factors the genotypes, sowing times and sites. The phenological development, biomass dynamics, radiation use efficiency and grain yield were evaluated. The accumulated degree-days demand for flowering decreased faster in the tropical ecosystem than in the subtropical ecosystem for late sowing. The radiation use efficiency values were similar in the subtropical ecosystem and yield was high for all sowing dates. On the other hand, the tropical ecosystem showed a high variation for radiation use efficiency values and yield. The higher accumulation of degree-days and solar radiation during the reproductive and grain-filling phases contributed to increase yield in both ecosystems.

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Author Biographies

  • Marcos Paulo dos Santos, Federal University of Goiás
    Produção Vegetal. Ecofisiologia de grandes culturas
  • Alencar Junior Zanon, Instituto Rio Grandense do Arroz - IRGA
    Pesquisador
  • Santiago Vianna Cuadra, Embrapa Clima Temperado
    Agrometeorologia
  • Silvio Steinmetz, Embrapa Clima Temperado
    Agrometeorologia
  • João Rodrigo de Castro, Federal University of Goiás
    Produção Vegetal. Ecofisiologia de grandes culturas
  • Alexandre Bryan Heinemann, Embrapa Arroz e Feijão, Santo Antônio de Goiás, GO
    Graduado em Agronomia pela Universidade Federal de Viçosa (1991), Mestrado em Irrigação e Drenagem pela ESALQ/Universidade de São Paulo (1996), Doutorado em Irrigação e Drenagem pela ESALQ/Universidade de São Paulo (2001), Pós-Doutorado em Produção Vegetal pela ESALQ/Universidade de São Paulo (2001-2002) e Pós-Doutorado em Aplicação de Modelos de Simulação de Crescimento no Melhoramento de Arroz de Terras Altas e Milho pelo CIRAD (França). Atualmente é pesquisador da Empresa Brasileira de Pesquisa Agropecuária, Unidade Arroz e Feijão. Tem experiência na área de Agronomia, com ênfase em Modelagem, atuando principalmente nos seguintes temas: utilização de modelos de simulação de crescimento de culturas para tomada de decisão em irrigação, manejo e melhoramento de culturas anuais.

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Published

2017-09-04

Issue

v. 47, n. 3, Jul./Sep. 2017

Section

Research Article

License

Authors will not be paid for published articles and must waive their copyright in favor of the PAT journal. On the other hand, they are solely responsible for the content of those articles, even if the Editor holds the right to adjust them to the norms of the journal. Authors are allowed to publish their articles simultaneously in their institutional repositories, as soon as the original publication at the PAT journal is mentioned.

How to Cite

SANTOS, M. P. DOS et al. Yield and morphophysiological indices of irrigated rice genotypes in contrasting ecosystems. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], v. 47, n. 3, p. 253–264, 4 Sep.2017.