Experimental strategies for clonal eucalyptus

Mendes, Matheus Henrique Silveira; Rosse, Leonardo Novaes; Toledo, Fernando H.; Ramalho, Magno Antônio Patto

doi:10.1515/sg-2014-0005

Cited by 3 publications

(5 citation statements)

References 6 publications

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“…There is not much information in this regard (RESENDE, 2002). However, the results show also that there were no big variations in the classification of treatments using plots of one plant compared to plots ranging from five to even 100 plants (ANDRADE et al, 2006;MENDES et al, 2014).…”

Section: Resultsmentioning

confidence: 79%

Performance of Eucalyptus clones according to environmental conditions

Souza¹,

Ramalho²,

Lima³

et al. 2017

Sci. For.

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The aim of this study was to verify if the selection site of clones affects their performance when used in other regions and to estimate the contribution of climate and soil factors in clonal performance when these were evaluated under different environmental conditions. Growth data were used for assessment of 49 Eucalyptus clones in eight environments. Clonal tests were set up in a randomized block design, with 30 or 40 replications, and plots consisted of one plant. Data concerning the volume of trees at three years of age were considered. Regression equations between the dependent variable (volume) and the independent variables (environmental factors) were obtained. It was found that the clones showed great variation in volumetric performance in different environments. The clone x location interaction was significant, showing that response of the clones did not coincide in different locations. For most of the clones, the selection site did not propitiate greater adaptation to the region of origin. The response to environmental factors varied among clones, especially for altitude, rainfall, boron, and zinc. Two clones stood out as the most stable and adapted to the three regions of planted forest.

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Section: Resultsmentioning

confidence: 79%

Performance of Eucalyptus clones according to environmental conditions

Souza¹,

Ramalho²,

Lima³

et al. 2017

Sci. For.

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“…Essas metodologias são empregadas frequentemente em diversas culturas, como cana-de-açúcar (Leite et al, 2009); melão (Dias, 2013); eucalipto (Mendes et al, 2014); tabaco (Toledo et al, 2013); mamão (Lima et al, 2007); sorgo (Lopes et al, 2005); milho (Cargnelutti Filho et al, 2011); café (Moraes, 2013) simulações, para cada tamanho de parcela, identificou-se a tendência da acurácia, sendo que o valor aumenta à medida que a quantidade de plantas em cada parcela aumenta. O comportamento desses dados resultou numa equação ajustada pelo modelo de Gompertz, e o possível ponto em que ocorre a mudança de curvatura é com 50 plantas, sendo de 0,70 a estimativa de acurácia seletiva média nessa condição.…”

Section: Resultsunclassified

“…Com as facilidades computacionais disponí-veis atualmente, os trabalhos de simulação tornaramse mais frequentes nos programas de melhoramento (Moraes, 2013;Toledo et al, 2013;Mendes et al, 2014). Uma das áreas em que a simulação ainda tem muito a contribuir é na avaliação de alternativas visando a melhoria da precisão experimental, entre elas a escolha do tamanho ideal das parcelas.…”

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Estratégias Experimentais Para Avaliar O Milho Hibrido

Maes¹,

Ramalho²,

Silva³

2017

RBMS

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RESUMO -Esse experimento foi realizado com o objetivo de propor o número de plantas na avaliação de híbridos simples de milho, se há necessidade de bordadura nos experimentos e se as diferentes linhas das parcelas afetam o desempenho dos híbridos. Foram avaliados seis híbridos simples comerciais no delineamento de blocos casualizados, com três repetições e parcelas de quatro linhas, com 40 plantas por linha. A colheita foi realizada por planta georreferenciada em cada linha/parcela. Para cada tamanho de parcela foram efetuadas 1.000 reamostragens, sendo realizadas as análises de variância e estimadas a acurácia e a coincidência na detecção dos dois melhores híbridos identificados na parcela padrão (160 plantas). Não há necessidade de bordadura e o desempenho dos híbridos não varia em função das linhas das parcelas. As estimativas da acurácia e a coincidência dos experimentos em identificar os dois melhores híbridos são muito grandes, em relação ao emprego de 160 plantas, a partir de parcelas com 50. A variação dentro das parcelas é sempre inferior à observada entre parcelas. Portanto, para reduzir custos e melhorar a eficiência dos programas de melhoramento de milho, as parcelas de avaliação de híbrido simples não necessitam ter mais do que 50 plantas.Palavras-chave: tamanho da parcela, efeito de bordadura, acurácia, melhoramento de milho. EXPERIMENTAL STRATEGIES TO EVALUATE CORN HYBRIDSABSTRACT -This experiment was conducted with the objective of proposing the number of plants for evaluating simple corn hybrids, as well as the need of borders in the experiment, and if the distinct plot lines affect hybrid performance. We evaluated six simple commercial hybrids, in a randomized block design, with three replicates and four lines of 40 plants each. Harvesting was conducted per georeferenced plant in each line/plot. For each plot size, we conducted 1.000 re-samplings, performing variance analyses and estimating the accuracy and coincidence in identifying the two best hybrids from the standard plot (160 plants). There is no need for borders, and hybrid performance does not vary in function of plot lines. The accuracy and coincidence estimates for identifying the two best hybrids are large in relation to the employment of 160 plants, based on plots with 50 plants. The range within the plots is always inferior to that observed between plots. Therefore, to reduce and improve the efficiency of corn breeding programs, the plots for evaluating simple hybrids have no need for more than 50 plants.

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“…For other spacings, the rank coincidences were always low. Mendes et al (2014), working with eucalyptus, estimated rank coincidence above 90% and found 55 plants for plot size.…”

Section: Study Of Parameters Through Bootstrappingmentioning

confidence: 99%

“…In other species, such as Eucalyptus, it has already been confirmed that decreases in plot size from 100 to 25 plants does not affect accuracy of selection and experimental precision, and such decreases may reduce costs in the breeding program (17). Working with brachiaria grass, Dias et al (2014) measured fresh biomass volume and carried out analysis through the bootstrapping method and the maximum curve of the coefficient of variation.…”

Section: Study Of Parameters Through Bootstrappingmentioning

confidence: 99%

Effect of plot size and plant spatial arrangement on the efficiency of family selection in sugarcane

Moraes

Mendes

Leite³

et al. 2021

Rev. FCA UNCUYO

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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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Experimental strategies for clonal eucalyptus

Cited by 3 publications

References 6 publications

Performance of Eucalyptus clones according to environmental conditions

Performance of Eucalyptus clones according to environmental conditions

Estratégias Experimentais Para Avaliar O Milho Hibrido

Effect of plot size and plant spatial arrangement on the efficiency of family selection in sugarcane

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