Yield and morphophysiological indices of irrigated rice genotypes in contrasting ecosystems

Authors

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

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, Universidade Federal de 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, Universidade Federal de 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

How to Cite

SANTOS, M. P. dos; ZANON, A. J.; CUADRA, S. V.; STEINMETZ, S.; CASTRO, J. R. de; HEINEMANN, A. B. Yield and morphophysiological indices of irrigated rice genotypes in contrasting ecosystems. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], Goiânia, v. 47, n. 3, p. 253–264, 2017. Disponível em: https://revistas.ufg.br/pat/article/view/45955. Acesso em: 22 dec. 2024.

Issue

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

Section

Research Article

License

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