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Abstract

Resumo -O objetivo deste trabalho foi determinar a precisão experimental na avaliação da massa de matéria verde de nabo forrageiro, em cenários formados por combinações de tamanhos de parcela e número de tratamentos e de repetições. Utilizaram-se os dados de massa de matéria verde de 3.456 unidades experimentais básicas de 0,5×0,5 m (0,25 m 2 ). Os cenários (1.728) foram planejados e formados pela combinação de seis tamanhos de parcela (0,25, 0,50, 1,00, 1,50, 2,00 e 2,25 m 2 ), i tratamentos (i = 5, 6,..., 20) e r repetições (r = 3, 4,..., 20). Em cada cenário, foram realizadas 2.000 reamostragens, com reposição. Calculou-se a média das 2.000 estimativas, em cada cenário, quanto à diferença mínima significativa pelo teste de Tukey, ao índice de variação e ao coeficiente de variação experimental. Essas estatísticas, nesta ordem, são adequadas para avaliar a precisão experimental. Parcelas com o tamanho de seis unidades experimentais básicas (1,50 m 2 ) são suficientes para identificar diferenças significativas na massa de matéria verde de nabo forrageiro entre tratamentos, menores ou iguais a 36,88% da média geral do experimento, pelo teste de Tukey, a 5% de probabilidade, em experimentos em delineamento inteiramente casualizado, com 5 a 20 tratamentos e cinco repetições.Termos para indexação: Raphanus sativus, coeficiente de variação, diferença mínima significativa, índice de variação, planejamento experimental, reamostragem. Experimental precision related to plot sizes, numbers of treatments and replicates in forage turnipAbstract -The objective of this work was to determine the experimental precision in the evaluation of forage turnip fresh matter weight, in scenarios formed by combinations of plot sizes and number of treatments and replicates. Data from fresh matter weight of 3,456 basic experimental units of 0.5×0.5 m (0.25 m 2 ) were used. The scenarios (1,728) were planned and formed by the combinations of six plot sizes (0.25, 0.50, 1.00, 1.50, 2.00, and 2.25 m 2 ), i treatments (i = 5, 6,..., 20), and r replicates (r = 3, 4,..., 20). For each scenario, 2,000 resamplings were carried out, with replacement. The average of these 2,000 estimates, in each scenario, was calculated for the least significant difference by Tukey's test, the variation index, and the experimental coefficient of variation. These statistics, in that order, are adequate to evaluate the experimental precision. Plots with the size of six basic experimental units (1.50 m 2 ) are sufficient to identify significant differences turnip fresh matter weight between treatments, less than or equal to 36.88% of the overall mean of the experiment, by Tukey's test, at 5% probability, in experiments in a completely randomized design with 5 to 20 treatments and five replicates.

Genetic variability of hull-less barley accessions based on molecular and quantitative data

“…Traits such as thousand seed weight (3.57%), protein (1.63%), cycle (0.78%), height (0.70%), lodging degree (0.38%) and hectoliter grain weight (0.24%) showed little contribution concerning variability. These results were different from the outcomes reported by Amabile et al (2013b), who found a contribution of 11.15%, for cycle, and 1.53%, for class 1.…”

“…The two-rowed materials located on the left side of the plot showing greater distances, and the six-rowed barley genotypes located on the right side and which were more grouped. Amabile et al (2013b) found the same type of grouping.…”

“…bras., Brasília, v.50, n.2, p.160-167, fev. 2015 DOI: 10.1590/S0100-204X2015000200008 additional information concerning existing variability in working collections (Manjunatha et al, 2007;Shakhatreh et al, 2010;Amabile et al, 2013b). The molecular variability of hull-less barley was quantified by Yu et al (2002) and Yang et al (2010).…”

“…Later on, the morphological and agronomical characterization of a set of barley accessions was made by Monteiro (2012), who included some "naked barley" (or hull-less barley) from the germplasm bank kept by Embrapa Recursos Genéticos e Biotecnologia. However, despite the gains obtained in a barley breeding program in the Cerrado biome, little is known about the variability existing in germplasm banks in Brazil (Amabile et al, 2013b). Barley is generally grown in Brazilian regions with temperate climate, more frequently in the southern part of the country for their cooler temperatures (Caierão et al, 2006).…”

Tamanho de unidades experimentais básicas e tamanho ótimo de parcelas para nabo-forrageiro

“…Essa metodologia diferencia-se da utilizada por Cargnelutti Filho et al (2014a) por contemplar mais tamanhos de parcela e por incluir cenários com o delineamento de blocos ao acaso, comumente utilizados em experimentos em campo; conforme sugerido pelos autores.…”