Methods of Soybean Genotypes Selection in Paraná State, Brazil

Abstract

The soybean crop presents several cultivars available. The performance of each cultivar in the field is associated with its genetic characteristics and the interaction of these with environment. Specific recommendations according to environment are made soybean cultivars release based on adaptability and stability analyzes. This research evaluated twelve soybean cultivars in the northern region of Paraná State Brazil, in order to recommend the most suitable and stable cultivar. The experiment was designed in complete randomized blocks four sites: Maringá, Floresta, Cambé and Apucarana, with four replications, in 2017/2018 growing season. Totaling 48 experimental units per site, that is, a total of 192 in the experiment. The variables evaluated were: one thousand grain mass, productivity, hectoliter weight, number of pods per plant and number of grains per plant. The cultivars were evaluated for adaptability and stability by the methodologies proposed by Lin and Binns (1988) and a bi-segmented regression method according to Cruz et al. (1989). The results indicated that the selection was more reliable when the two methodologies were used, due to their correlation coefficients. Soybean cultivar 3 presented promising behavior in regions studied.

Modelo de Estabilidade de Ecovalência e Eberhart & Russell na definição da dose mais sustentável de fornecimento de nitrogênio em aveia

“…Modelos matemáticos possuem grande aplicabilidade no estudo de sistemas agrários. Alguns destes modelos foram desenvolvidos para o estudo da característica da estabilidade, que é a capacidade de uma cultivar em apresentar um comportamento previsível de acordo com o estímulo ambiental que a mesma está sendo exposta [2,6]. Dentre estas técnicas, podemos citar o modelo de Wrike [12] conhecido também como modelo de Ecovalência e o modelo de Eberhart & Russel [3].…”