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Pesquisa Agropecuária Tropical

On-line version ISSN 1983-4063

Abstract

ALVAREZ, Rita de Cassia Felix; CRUSCIOL, Carlos Alexandre Costa  and  NASCENTE, Adriano Stephan. Growth analysis and yield of traditional, intermediate and modern upland rice cultivars. Pesqui. Agropecu. Trop. [online]. 2012, vol.42, n.4, pp.397-406. ISSN 1983-4063.  http://dx.doi.org/10.1590/S1983-40632012000400008.

The growth analysis allows the characterization and understanding of the upland rice cultivars development. This study aimed at characterizing, by using the growth analysis, the physiological components and agronomic performance, as well as the differences among traditional, intermediate and modern upland rice cultivars. The experiment was conducted under upland rice conditions, favored by the use of supplementary irrigation. The experimental design was randomized blocks, with three treatments consisting of traditional (Caiapó), modern (Maravilha) and intermediate (BRS Primavera) cultivars and eight replications. The leaf area index (LAI), instantaneous growth rate (IGR), relative growth rate (RGR), net assimilation rate (NAR) and specific leaf area (SLA), as well as grain yield and yield components, were evaluated. The intermediate and traditional cultivars presented the highest total dry matter accumulation rate, while the traditional and modern ones showed the highest LAI. The intermediate cultivar presented the highest IGR, RGR, NAR and SLA levels, as well as the highest grain yield, as a consequence of the higher spikelet fertility and 1,000 grain mass.

Keywords : Oryza sativa L.; plant development; leaf area index; plant physiological components.

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