Simulação do desenvolvimento da batata cultivar asterix em cinco cenários de mudanças climáticas em Santa Maria, RS

Streck, Nereu Augusto; Lago, Isabel; Alberto, Cleber Maus; Bisognin, Dílson Antônio

doi:10.1590/s0006-87052006000400021

Cited by 14 publications

(24 citation statements)

References 31 publications

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“…A few studies, however, reported an increase in the duration of developmental phases, when temperature was increased by 2 up to 6 o C (Streck et al, 2006). These studies used different approaches to describe the effect of temperature Genotype Climate scenarios Developmental phase 1a 1b 2a 2b 3a 3b 4a 4b 5a 5b Hybrid Table 5.…”

Section: Resultsmentioning

confidence: 99%

“…One of such limitations is that most of the studies consider crops are free of insects, diseases and weeds (Lal et al, 1998;Streck et al, 2006), but some studies have demonstrated that plant pests increase in climate change scenarios (Ghini et al, 2008). These results showed that current modern rice genotypes could be less competitive with red rice in simulated future climates.…”

Section: Resultsmentioning

confidence: 99%

“…Coefficients r max,v , r max,r , r max,gf for each developmental phase (EM-R1, R1-R4 and R4-R9) and for each genotype, are presented in Simulations for each of the 100 years, in each scenario (Table 1), started on November 15, which is within the currently recommended sowing period (from October 1 st to December 10) for Santa Maria, RS (Sosbai, 2007). The duration, in days, of the EM-R1, R1-R4, and R4-R9 developmental phases was calculated for each of the 100 years of the climate scenarios (Streck et al, 2006). Data analysis consisted of calculating the deviations (difference between climate-change scenarios and non-climate change scenario) of the developmental phase duration, for the 100 years and averaging the deviations for each climate scenario, as suggested by Weiss et al (2003).…”

Section: Methodsmentioning

confidence: 99%

“…Crop models are some of the tools used in studies of crop development response to climate change (Streck, 2005;Streck et al, 2006). Among several environmental factors, temperature is a major abiotic factor that drives rice development (Gao et al, 1992;Infeld et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

“…Linear models usually work well at "normal" temperature, but fail when crops develop at under and above "normal" temperature (Streck et al, 2007). Therefore, when assessing crop development response to climate change scenarios, nonlinear models should be preferred (Streck et al, 2006). Some researches have been devoted to study the effect of climate change on rice development (Lal et al, 1998;Tao et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Impact of increasing mean air temperature on the development of rice and red rice

Lago

Streck

Alberto

et al. 2008

Pesq. agropec. bras.

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-The objective of this study was to assess the development response of cultivated rice and red rice to different increases in minimum and maximum daily air temperatures, in Santa Maria, Rio Grande do Sul State, Brazil. One hundred years climate scenarios of temperatures 0, +1, +2, +3, +4, and +5 o C, with symmetric and asymmetric increases in minimum and maximum daily air temperatures were created, using the LARS-WG Weather Generator, and a 1969-2003 database. Nine cultivated rice genotypes (IRGA 421, IRGA 416, IRGA 417, IRGA 420, BRS 7 TAIM, BR-IRGA 409, EPAGRI 109, EEA 406 and a hybrid), and two red rice biotypes (awned black hull-ABHRR, and awned yellow hull-AYHRR) were used. The dates of panicle differentiation (R1), anthesis (R4), and all grains with brown hulls (R9) were estimated with a nonlinear simulation model. Overall, the duration of the emergence-R1 phase decreased, whereas the duration of the R1-R4 and R4-R9 phases most often increased, as temperature increased in the climate change scenarios. The simulated rice development response to elevated temperature was not the same, when the increase in minimum and maximum temperature was symmetric or asymmetric.Index terms: Oryza sativa, global warming, phenology, simulation, weeds. Impacto do aumento na temperatura média do ar sobre o desenvolvimento do arroz e do arroz-vermelhoResumo -O objetivo deste trabalho foi avaliar a resposta do desenvolvimento do arroz cultivado e do arroz vermelho a diferentes aumentos nas temperaturas mínima e máxima diárias do ar, em Santa Maria, RS, Brasil. Foram criados cenários climáticos de cem anos de 0, +1, +2, +3, +4 e +5 o C, com aumentos simétricos e assimétricos nas temperaturas mínima e máxima diária do ar, usando o Weather Generator LARS-WG e uma base de dados de 1969-2003. Foram usados nove genótipos de arroz cultivado (IRGA 421, IRGA 416, IRGA 417, IRGA 420, BRS 7 TAIM, BR-IRGA 409, EPAGRI 109, um híbrido e EEA 406) e dois biótipos de arroz-vermelho (casca preta aristado e casca amarela aristado). A data da diferenciação da panícula (R1), a antese (R4) e todos os grãos com casca marrom (R9) foram estimados com um modelo não linear. Em geral, a duração da fase emergência-R1 diminuiu, enquanto a duração das fases R1-R4 e R4-R9 aumentaram, com o aumento da temperatura nos cenários de mudança climática. A resposta simulada do desenvolvimento do arroz à elevação da temperatura não foi a mesma, quando o aumento na temperatura mínima e máxima foi simétrico ou assimétrico.Termos para indexação: Oryza sativa, aquecimento global, fenologia, simulação, planta daninha.

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Section: Resultsmentioning

confidence: 99%