Tamanho de amostra de caracteres de genótipos de soja

Filho, Alberto Cargnelutti; Evangelista, Dilson Henrique Ramos; Gonçalves, Elaine Cristine Piffer; Storck, Lindolfo

doi:10.1590/s0103-84782009005000016

Cited by 21 publications

(19 citation statements)

References 13 publications

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“…During the second season, the data were similar to the first, but with higher values ranging from 16.41% to 31.04%, where the largest variability was at the beginning of the crop cycle. The plant height CV values were similar to those of plant height at maturity, and the number of nodes per plant in a soybean culture (CARGNELUTTI FILHO et al, 2009) and were similar to those for the plant height of crambe (CARGNELUTTI FILHO et al, 2011). These results suggest that at the beginning of the cycle, in both years, a larger sample size is required to estimate mean plant height, and in the second season, a larger sample size should be permitted in comparison to the first season.…”

Section: Resultssupporting

confidence: 72%

“…The variability in the stem diameter CV values was minimal within and between seasons, demonstrating the homogeneity of observations. This CV trend was similar to that found for the height of insertion of the first pod in the cultivation of soybeans, evaluated in five experiments, with 28 soybean genotypes (CARGNELUTTI FILHO et al, 2009). …”

supporting

confidence: 86%

“…The ideal sample size has been determined to estimate the mean of morphological traits in crops, such as soybean (CARGNELUTTI FILHO et al, 2009), castor bean (CARGNELUTTI FILHO et al, 2010), other bean crops (CARGNELUTTI FILHO et al, 2008) and turnip (CARGNELUTTI FILHO et al, 2014). However, similar studies for pigeonpea have not been conducted.…”

Section: Introductionmentioning

confidence: 99%

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Sample size for morphological traits of pigeonpea

Facco

Filho

Lúcio

et al. 2015

SCA

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The objectives of this study were to determine the sample size (i.e., number of plants) required to accurately estimate the average of morphological traits of pigeonpea (Cajanus cajan L.) and to check for variability in sample size between evaluation periods and seasons. Two uniformity trials (i.e., experiments without treatment) were conducted for two growing seasons. In the first season (2011/2012), the seeds were sown by broadcast seeding, and in the second season (2012/2013), the seeds were sown in rows spaced 0.50 m apart. The ground area in each experiment was 1,848 m 2 , and 360 plants were marked in the central area, in a 2 m × 2 m grid. Three morphological traits (e.g., number of nodes, plant height and stem diameter) were evaluated 13 times during the first season and 22 times in the second season. Measurements for all three morphological traits were normally distributed and confirmed through the Kolmogorov-Smirnov test. Randomness was confirmed using the Run Test, and the descriptive statistics were calculated. For each trait, the sample size (n) was calculated for the semiamplitudes of the confidence interval (i.e., estimation error) equal to 2, 4, 6, ..., 20% of the estimated mean with a confidence coefficient (1-α) of 95%. Subsequently, n was fixed at 360 plants, and the estimation error of the estimated percentage of the average for each trait was calculated. Variability of the sample size for the pigeonpea culture was observed between the morphological traits evaluated, among the evaluation periods and between seasons. Therefore, to assess with an accuracy of 6% of the estimated average, at least 136 plants must be evaluated throughout the pigeonpea crop cycle to determine the sample size for the traits (e.g., number of nodes, plant height and stem diameter) in the different evaluation periods and between seasons. Key words: Cajanus cajan L., sample dimensioning, experimental precision ResumoOs objetivos deste estudo foram determinar o tamanho de amostra (número de plantas) para estimação da média de caracteres morfológicos de feijão guandu (Cajanus cajan L.) e verificar se há variabilidade do tamanho de amostra entre as épocas de avaliação e entre os anos agrícolas. ensaios de uniformidade (experimentos sem tratamentos), em dois anos agrícolas. No primeiro ano agrícola (2011/2012), a semeadura foi realizada a lanço e no segundo ano agrícola (2012/2013), a semeadura foi realizada em linhas espaçadas a 0,50 m. A área útil, em cada um dos experimentos foi de 1.848 m 2 , e foram demarcadas 360 plantas, na área central, em um gride de 2 m × 2 m. Foram avaliados três caracteres morfológicos (número de nós, altura de planta e diâmetro de caule) em 13 épocas no primeiro ano agrícola e em 22 épocas no segundo ano agrícola. Em todos os caracteres foi verificada a normalidade, por meio do teste de Kolmogorov-Smirnov e a aleatoriedade pelo Run Test e calculadas as estatísticas descritivas. Para cada caractere, foi calculado o tamanho de amostra (n), para as semiamplitudes do intervalo de confiança (...

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Section: Resultssupporting

confidence: 72%

supporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

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Sample size for morphological traits of pigeonpea

Facco

Filho

Lúcio

et al. 2015

SCA

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“…Cargnelutti Filho et al (2009), besides verifying variability in sample size among the traits, found differences regarding the sample size among soybean genotypes. This can also be described in the present study, once that for the cultivar BRS Progresso, in general, the sample sizes were smaller than for cultivar Temprano.…”

mentioning

confidence: 83%

Sample Sufficiency for Estimation of the Mean of Rye Traits at Flowering Stage

Bandeira¹,

Filho²,

Carini³

et al. 2018

JAS

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The objective of this study was to determine the sample size to estimate the traits mean in cultivars and sowing times, at flowering of rye culture. Ten uniformity trials were performed combining two cultivars in five sowing times. In the flowering of culture, in 100 plants of each uniformity trial, eleven traits were evaluated. The descriptive statistics was calculated and it was determined the sample size to estimate the mean in levels of precision (amplitude of the confidence interval of 95% for 5, 10, …, 35% of the mean) by resampling with replacement. The cob length presented the lowest variability among the eleven traits and, consequently, smaller sample size in both cultivars and five sowing time. There is variability in the sample size to estimate the mean among the traits, cultivars and sowing times. The measurement of 425, 276, 189 and 138 plants in cultivar BRS Progresso and 642, 413, 285 and 211 plants in cultivar Temprano, are enough to estimate the mean amplitude of the confidence interval of 95% maximum of 20, 25, 30 and 35%, respectively, for all the traits and sowing times.

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“…The greater the degree of confidence, the lower the error values, which may be determined by the researcher in the experimental planning phase. Nevertheless, sample size may be estimated to obtain the desired accuracy (Cargnelutti Filho et al, 2009). The lower the estimation error allowed, the higher the number of observations to be evaluated.…”

Section: Introductionmentioning

confidence: 99%

Sample Size for Morphological Traits of Sunn Hemp

Schabarum¹,

Filho²,

Lavezo³

et al. 2017

JAS

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Sunn hemp (Crotalaria juncea L.) is an annual leguminous plant used for crop rotation, biomass formation, biological nitrogen fixation, and nematode control. To this end, sampling is an important tool owing to its advantages, such as low cost and fast data acquisition. This study aimed to determine the sample size required to estimate the mean morphological traits of sunn hemp and to assess sample size variability among traits, crop development stages, and sowing seasons. Two uniformity trials were performed in the field during the 2014/2015 harvest. Crops were sown in October and December on an experimental area of the Department of Crop Science at the Federal University of Santa Maria, Brazil. An area of 1,200 m 2 was allocated for each trial. Each trial was divided into 2 m × 2 m grids, which formed 25 rows and 12 columns. One plant was marked per plot, totaling 300 plants in each trial. Leaf number and plant height were assessed weekly. Stem diameter and root length were measured at flowering. Normality and randomness tests were performed on each trait. The sample sizes (plants number) were calculated for the confidence interval half-widths (estimation errors) of the 2, 4, …, 20% mean estimates. There is variability of the sample size (plants number) between morphological traits, crop development stages, and sowing seasons. When choosing a single sample size to evaluate the morphological traits of sunn hemp, at least 70 plants should be sampled for an accuracy of 10% and a 95% confidence level.

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Tamanho de amostra de caracteres de genótipos de soja

Cited by 21 publications

References 13 publications

Sample size for morphological traits of pigeonpea

Sample size for morphological traits of pigeonpea

Sample Sufficiency for Estimation of the Mean of Rye Traits at Flowering Stage

Sample Size for Morphological Traits of Sunn Hemp

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