Análise conjunta de ensaios de cultivares de milho por classes de interação genótipo x ambiente

Abstract

Resumo -O objetivo deste trabalho foi avaliar a contribuição do uso de classes de cultivares com e sem interação genótipo x ambiente, na qualidade da análise conjunta de ensaios de milho, quanto à produtividade de grãos. Foram usados dados de produtividade de grãos de milho de 99 ensaios, distribuídos em 12 grupos, cada um com as mesmas cultivares, em diferentes ambientes. Em cada grupo, 9 a 40 cultivares foram avaliadas em 5 a 12 ambientes, durante três anos agrícolas. Para cada grupo, foi realizada análise de variância conjunta e cada cultivar foi testada quanto a sua contribuição para a interação, tendo-se formado duas classes de cultivares: CI, que contribuem para a interação com o ambiente; e SI, que não contribuem para a interação com o ambiente. Para cada classe, realizou-se nova análise de variância conjunta e testou-se a contribuição da cultivar para a interação. A classificação das cultivares quanto a sua contribuição para a interação genótipo x ambiente permite realizar análise conjunta para cada classe de cultivares, com melhor acurácia na comparação das médias das cultivares da classe SI e na análise da interação das cultivares da classe CI.Termos para indexação: Zea mays, acurácia seletiva, análise de adaptabilidade, indicação de cultivares. Joint analysis of corn cultivar trials by classes of genotype x environment interactionAbstract -The objective of this work was to evaluate the contribution of the use of classes of cultivars with and without interaction with the environment, on the quality of joint analysis of corn trials for grain productivity. Corn grain productivity data from 99 trials, distributed in 12 groups, each with the same cultivars in different environments, were used. In each group, 9 to 40 cultivars were assessed in 5 to 12 environments during three farming years. For each group, joint analysis of variance was performed and each cultivar was tested for its contribution to the interaction, forming two classes of cultivars: CI, which contribute to the interaction; and SI, which do not contribute to the interaction. For each class, a new joint analysis of variance was performed and the contribution of the cultivar to the interaction was tested. The classification of cultivars based on their contribution to the genotype x environment interaction allows performing joint analysis for each cultivar class with better accuracy when comparing means of the SI cultivars and when analyzing the interaction of the CI cultivars.

Wheat yield obtained from nitrogen dose and fractionation

“…The wide variation of grain yield is associated with variability of crop conditions, and the proper management of critical nitrogen on wheat productivity increased (Storck et al, 2014). Nitrogen is one of the most required nutrients and, in most cases, is not offered at the optimal dose and time to ensure productivity (Camponogara et al, 2016).…”

Adaptability and Stability of Yield and Industrial Grain Quality with and without Fungicide in Brazilian Oat Cultivars

“…An efficient analysis in describing this interaction requires more adjusted models in defining cultivars for recommendation [5]- [24]. The analysis of adaptability and stability detail the effects of this interaction enabling define predictable and responsive behavior cultivars to environmental variations [6]- [17].…”

“…Sensitivity to environmental conditions and susceptibility to foliar diseases may be associated with large variability of edaphoclimatic conditions in Brazil and the indication of cultivars of reduced adaptability and stability to different microclimates [16] [17]. In modern agriculture, the recommendation of cultivars with high grain yield and with stability to climatic variations is decisive, by taking advantage of improved environments or that showing adequate performance under adverse conditions [6]- [18].…”

Adaptability and stability of peach and nectarine cultivars in subtropical climate

“…Differential performance of genotypes in different environments, i.e., the interaction genotypes x environments, results in changes in the values of differences between genotypes from one year to another (Silva, 2008). This inconsistency of cultivar performance in response to environmental stimuli makes it difficult to identify adapted and stable cultivars (Storck et al, 2014).…”