The objective of this work was to select superior sugarcane (Saccharum officinarum) clones with good stability and adaptability, considering the genotype x environment interaction in two productive cycles. Twenty-five early clones plus five control clones were evaluated during two cuts (ratoon cane and plant cane) in 24 environments. A randomized complete block design was used, with three replicates. Tons of stems per hectare and tons of pol per hectare were evaluated. To verify adaptability and stability, the bisegmented regression and the multivariate (AMMI and GGE biplot) methods were used. According to the three methods, which are complementary regarding the desired information, the most promising clones in terms of stability and general adaptability are G5, G12, and G13; the last two are closest to the ideal genotype. The G13 clone is highly productive in favorable and unfavorable environments, presenting the highest averages for ton of stems and pol per hectare. The G3, G4, G10, G15, G17, G18, G22, G23, G25, G26, and G30 clones are not recommended for the 24 evaluated environments.
ResumoO uso de bioestimulantes na cultura da cana-de-açúcar (Saccharum officinarum L.) é uma prática de manejo que potencialmente pode incrementar sua produtividade e o seu rendimento industrial, favorecendo o bom desempenho dos processos vitais da planta, permitindo obter melhores e maiores colheitas, mesmo sob condições ambientais adversas. Para o efeito desejado com o uso de bioestimulantes específicos é importante conhecer o processo regulado pelo hormônio ou grupo de hormônios, a dose necessária para manipular o processo, bem como o órgão da planta onde ocorrerão as reações biológicas. Por sua composição de múltiplos hormônios em baixas concentrações, bem como pelas pequenas doses recomendadas, a aplicação isolada de um bioestimulante dificilmente poderá regular ou manipular
The purpose of this study was to identify the ideal sample size representing a family in its potential, to identify superior families and, in parallel, determine in which spatial arrangement they may have a better accuracy in the selection of new varieties of sugarcane. For such purpose, five families of full-sibs were evaluated, each with 360 individuals, in the randomized blocks design, with three replications in three different spacing among plants in the row (50 cm, 75 cm, and 100 cm) and 150 cm between the rows. To determine the ideal sample size, as well as the better spacing for evaluation, the bootstrap method was adopted. It was observed that 100 cm spacings provided the best average for the stalk numbers, stalk diameter and for estimated weight of stalks in the stool. The spacing of 75 cm between the plants allowed a better power of discrimination among the families for all characters evaluated. At this 75 cm spacing was also possible to identify superior families with a sample of 30 plants each plot and 3 reps in the trial. Highlights The bootstrap method was efficient to determine the ideal sample size, as well as the best spacing for evaluation. The 75-cm spacing had the highest power of discrimination among families, indicating that this spacing is the most efficient in evaluating sugarcane families for selection purposes. From all the results and considering selective accuracy as the guiding parameter for decision making, the highest values obtained considering the number of stalks and weight of stalks in the stools were found at the 75-cm spacing.
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Ata da Defesa com as respectivas assinaturas dos membros da banca encontra-se no processo de vida acadêmica do aluno. AGRADECIMENTOSPrimeiramente agradeço a Deus por ter me dado saúde, capacitação e sabedoria para conquistar mais essa etapa. Agradeço a minha esposa Fabiani de Azevedo que sempre me apoiou em todos os momentos desta minha jornada e aos meus familiares pelo apoio.Um agradecimento mais que especial ao meu orientador Professor Dr.Antônio Carlos Pacagnella Júnior, pelos ensinamentos, dedicação e amizade, sempre contribuindo com o trabalho e me motivando a cada etapa.
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