Resumo

OSTENGO, Santiago et al. TUC 95-10 productive performance analysis by a multienvironment and multi-age mixed model. Rev. ind. agric. Tucumán [online]. 2014, vol.91, n.2, pp.25-29. ISSN 1851-3018.

In 2011, the Sugarcane Breeding Program of Estación Experimental Agroindustrial Obispo Colombres (Tucumán, R. Argentina) released TUC 95-10 variety commercially. The new cultivar was evaluated in a series of multienvironment trials across different crop ages to assess its productive performance in Tucumán sugarcane area and compare it with LCP 85-384, the principal variety in the province. On account of their flexibility, linear mixed models (LMM) allow evaluating the suitability of varieties with a multienvironment and multi-age single model, since they consider the existence of heterogeneous residual variances among different environments and the possible lack of independence among observations, i.e temporal correlations among crop ages and spatial correlation among neighboring plots. This work aimed to evaluate TUC 95-10 productive performance and industrial quality with a multienvironment LMM through different crop ages. The trials were conducted at six locations during three crop ages (plant, first and second ratoon). LMM alternatives contemplated correlations (temporal and/or spatial) and heteroscedasticities for tons of cane per hectare (TCH), sugar content (SC%) and ton of sugar per hectare (TSH) in the structure of (co) variances of errors. The adjusted LMM provided a better fit of the data than that obtained with an ANOVA model with classical assumptions of homogeneity of variances and independence of observations, while providing more precise estimates (lower standard error) for statistical comparisons of expected yields. The results from comparisons of means and standard errors of the best models proved that TUC 95-10 is a variety with high yield potential, with TCH and TSH values significantly superior to those of LCP 85-384 across locations and crop ages.

Palavras-chave : sugarcane; new cultivar; LCP 85-384; multienvironment trials.

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