Optimum Size and Shape of Experimental Units for Cassava Cropping

Assis, Janilson Pinheiro de; Rodrigues, Walter; Linhares, Paulo César Ferreira; Alves, Lunara de Sousa; Pereira, Maria Francisca Soares; Paula, José Aluisio de Araújo; Oliveira, Ariana da Mota

doi:10.9734/jeai/2019/v31i630090

Cited by 3 publications

(7 citation statements)

References 9 publications

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“…It was verified that the CV was the factor that most influenced the convenient size of the plot, because there were considerable increments in the convenient size of the plot estimated with the increase in CV, for any combination of d, I and r. These results are similar to those obtained by Muniz et al (2009), Oliveira et al (2011), Silva (2009, Sousa, Silva and Assis (2016) and Assis et al (2019), with eucalyptus, candeia [Eremanthus erythropappus], melon, sunflower and cassava, respectively.…”

Section: Resultssupporting

confidence: 79%

“…Significant reductions in the convenient plot sizes were observed with the increase in the number of replicates, while d, I and CV were kept fixed. This confirms the effect of increasing the number of replicates on the improvement of experimental precision (Silva 2009;Stork et al 2007;Silva and Assis 2016;Assis et al 2019), which promotes greater efficiency in the use of small plots associated with a greater number of replicates, to detect lower percentage differences between cultivars, compared to the use of larger plots with a smaller number of replicates (Silva 2009;Silva andAssis 2016 andAssis et al 2019).…”

Section: Resultssupporting

confidence: 58%

“…In the literature there are several studies reporting the optimal plot size for different situations and different crops, such as: tomato (Lúcio et al 2010;Lúcio et al 2012), lettuce (Lúcio et al 2011), candeia [Eremanthus erythropappus] (Oliveira et al 2011), beans (Santos et al 2012), rice (Cargnelutti Filho et al 2012), coffee (Morais 2013), sunflower (Sousa et al 2015;Silva and Assis 2016) and cassava (Sousa et al 2018;Assis et al 2019), but no studies were found on the size and shape of experimental plot for sesame.…”

Section: Introductionmentioning

confidence: 99%

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Plot size and shape for Sesame experiments

Assis¹,

Lima²,

França³

et al. 2023

OLEL

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In agricultural experimentation, the use of adequate plot size and shape is an important experimental technique to increase the precision of the experiment. Thus, the objective of this study was to determine the appropriate size and shape of the plot for field experimentation with sesame. For this, the experiment was conducted in randomized complete blocks with 14 sesame cultivars in four replicates. The plots were composed of four 0.8-meter-long rows, at spacing of 0.6 m between rows and 0.1 m between plants. The plot area (0.72 m2), composed of the two central rows, was divided into 12 basic units, each constituted by one plant in the row (0.06 m2), to obtain the seed yield of sesame. The convenient size of the experimental plot was estimated by the Hatheway’s method and its adequate shape was determined by the relative information method. The Hatheway’s method allowed the estimation of several convenient plot sizes, many of sizes applicable for sesame cultivar evaluation experiments. A rectangular 1 x 6 plot (row with six plants and 0.36 m2 of floor area) was considered the adequate shape to evaluate seed yield of sesame cultivars and was also smaller than the size generally indicated in surveys with the sesame crop.

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Section: Resultssupporting

confidence: 79%

Section: Resultssupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

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Plot size and shape for Sesame experiments

Assis¹,

Lima²,

França³

et al. 2023

OLEL

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“…The maximum curvature method determines the optimal plot area that will ensure that the experimental data are representative [8][9][10]. Some scholars combined mathematical statistics formulae with Smith's empirical formula for soil heterogeneity, and thus developed a formula for determining the most appropriate area of the experiment plot, referred to as the Hatheway method, which takes the number of experimental repetitions and applies it to tomato, sunflower, cassava, papaya, and other crops [11][12][13][14]. Both methods have their advantages and disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Plot Layout Method of Field Experiment for Wheat with Border Irrigation Based on Soil Water Content Heterogeneity

Song,

Shen,

Wang

et al. 2023

Agronomy

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The objective of this research was to improve the accuracy and representativeness of experimental plot studies by determining the optimum plot area and replication number for winter wheat with border irrigation. Considering the spatial distribution of soil water content, the border effect in relation to crop growth, and the lateral seepage of soil water, we sought to study and optimize the area and specifications of irrigation experiment plots with different levels and replicates. The results show that the experimental irrigation plot consisted of two parts—the core area and the guard area. The most suitable area for the experiment plot core area, with a single level and without replicates, was 60–80 m2. The core experimental area can be arranged with two replicates per 40 m2, with differences in soil moisture content between the treatments reaching more than 15% at the two experiment levels. Each plot comprised two replicates, or if they were 20 m2, then they contained three replicates; when the soil moisture contents differed between 10% and 15%, the area of each replicate plot was 80 m2, comprising two replicates, or 30 m2 with three replicates. When the difference in soil moisture content between the treatments exceeded 15% with the three experimental levels, the area of each plot was 30 m2 and they contained two replicates, or 20 m2 containing three replicates; at differences of 10% to 15%, each replicate plot was 50 m2 containing two replicates, or 30 m2 with three replicates. The experimental plots were rectangular, with irrigation furrows dug lengthwise; therefore, the plots had aspect ratios between 7:1 and 5:1. The width of the buffer area was over 60 cm. The effect of the border on plant height and LAI for winter wheat primarily emerged with one to three rows (20–60 cm) at the jointing stage, while the effect on grain yield and biomass in winter wheat mainly emerged with one to two rows (20–40 cm). The conclusions of this research will inform the development of surface irrigation methods for silt loam in northern Henan, as a reference for optimizing experiment plots employing border irrigation with different soil textures.

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“…pequeno, mas depois que esta atinge tamanho adequado, se ganha pouco em precisão pelo aumento do tamanho da parcela com o incremento de mais área à esta parcela. Vários pesquisadores(Henriques Neto et al, 2004; Donato et al, 2008; Oliveira et al, 2011, Sousa;Silva;Assis, 2016;Sousa et al, 2018;Assis et al 2019), avaliando diferentes tamanhos de parcelas, relataram que o CV diminuí com o aumento do tamanho da parcela, mas ao se atingir o tamanho ótimo, o ganho em precisão reduz rapidamente com o acréscimo de mais área à parcela. Tabela 1.…”

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Tamanho ótimo de parcela para avaliação do rendimento de sementes do gergelim

De Sousa,

De Assis,

De Lima

et al. 2023

OLEL

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O objetivo desse trabalho foi determinar o tamanho adequado de parcela para avaliação do rendimento de sementes do gergelim. Foi realizado um experimento no delineamento em blocos completos casualizados com 14 cultivares de gergelim e quatro repetições. As parcelas foram constituídas de quatro fileiras de 0,8 metros de comprimento, espaçadas de 0,6 m e entre plantas de 0,1 m. A área útil da parcela, composta das duas fileiras centrais, foi dividida em 12 unidades básicas (UBs), cada uma constituída de uma planta na fileira, sendo medido o rendimento de sementes do gergelim por unidade básica. O rendimento de sementes das UBs adjacentes foram agrupadas de modo a formar sete tipos de parcelas de cinco tamanhos diferentes pré-estabelecidos. O tamanho ótimo da parcela experimental foi estimado por meio dos métodos da máxima curvatura modificado (0,28 m2) e do modelo linear segmentado com platô (0,27 m2), sendo o tamanho de 0,28 m2 de área útil considerada adequada para avaliação do rendimento de sementes de gergelim e menor que o tamanho geralmente usado nas pesquisas com o gergelim.

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Optimum Size and Shape of Experimental Units for Cassava Cropping

Cited by 3 publications

References 9 publications

Plot size and shape for Sesame experiments

Plot size and shape for Sesame experiments

Plot Layout Method of Field Experiment for Wheat with Border Irrigation Based on Soil Water Content Heterogeneity

Tamanho ótimo de parcela para avaliação do rendimento de sementes do gergelim

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