Optimal size of experimental plots of papaya trees using a modified maximum curvature method

Silva, Mauricio dos Santos da; Silva, Sebastião de Oliveira e; Donato, Sérgio Luíz Rodrigues; Filho, Orlando Melo Sampaio; Silva, Gilmara de Melo Araújo

doi:10.1590/0103-8478cr20180930

Cited by 2 publications

(2 citation statements)

References 9 publications

(11 reference statements)

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“…Size and shape of experimental plots have been discussed by several papers. Sousa et al (2016, Guimarães et al (2019a, 2019b and Silva et al (2019) reported a reduction in CV with increasing plot size. However, after determining the optimum plot size, no significant increase in precision has been reported with increasing plot size (CARGNELLUTI FILHO et al, 2018).…”

Section: Relation Between Relative Information and Coefficient Of Variationmentioning

confidence: 96%

Plot Size and Shape for Field Trials With Forage Cactus Pear

et al. 2021

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This study aimed to determine the size and shape of experimental plots that provide maximum precision using relative information method. This trial was conducted at the Federal Institute of Bahia. Plant height, cladode length, cladode width, cladode thickness, cladode area, cladode area index, number of cladodes, cladode total area and yield were measured in the third production cycle, 930 days after planting. The plants, defined as basic units, were arranged in 39 plot sizes so that the crop would fill the whole experimental area. Then, plot shapes with higher relative information and equal plot size in basic units were selected. The experimental plot with eight basic units in size ensures higher efficiency in the experimental evaluation. This combination between size and shape, besides meeting all evaluation requirements of the characteristics normally assessed in studies with forage cactus pear, has the maximum control of soil heterogeneity, thereby decreasing experimental error and significantly increasing precision.

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Section: Relation Between Relative Information and Coefficient Of Variationmentioning

confidence: 96%

Plot Size and Shape for Field Trials With Forage Cactus Pear

et al. 2021

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“…Therefore, to ensure sampling representativeness to evaluate experiments is necessary to consider the arrangement and the plant species within a silvopastoral system (Albrecht and Kandji, 2003;Nair et al, 2009;Oliveira et al, 2016a). Different models have already used heterogeneity in the soil (Lorentz et al, 2010;Li, 2019;Pereira et al, 2017;Saste and Sananse, 2015;Silva et al, 2019). While the modified maximum curvature (MMC) method correlates the ideal number of samples with the coefficient of variation (Facco et al, 2018;Pereira et al, 2017;Silva et al, 2019), the Hatheway method estimates the minimum difference between the treatments determining the optimal number of repetitions per plot (Donato et al, 2018;Mello et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Sampling representativeness of soil carbon and physiological parameters of marandu palisadegrass in a tropical silvopastoral system

Oliveira

Azevedo

Ribeiro

et al. 2021

Sci. agric. (Piracicaba, Braz.)

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The sampling methods for soil and plant evaluation in integrated production systems need to be refined for their use in experiments. This study purposed a sampling representativeness model to evaluate soil carbon and physiological parameters of marandu palisadegrass intercropped with double rows of eucalyptus in a silvopastoral system in southeastern Brazil. Four transects were delimited within the silvopastoral system and the soil was sampled at 0-5, 5-10, and 10-20 cm depths to evaluate two parameters of soil organic matter: total organic carbon (TOC) and soil microbial carbon (Cmic). We also evaluated three physiological parameters of marandu palisadegrass: stomatal conductance, transpiration rate, and photosynthetic rate. The sampling strategy was evaluated by the Hatheway and Modified Maximum Curvature (MMC) methods.We found that cultivation of the alley with forage grass and double rows of eucalyptus must be considered to ensure sampling representativeness in a silvopastoral system, once TOC and Cmic and physiological parameters showed variation within the integrated production system. The MMC method could be useful to evaluate silvopastoral systems for experiments and characterization of agricultural areas, as 11 soil samples are representative to evaluate Cmic and TOC, and 13 samples are enough to evaluate the physiological parameters in marandu palisadegrass. The Hatheway method could be applied to experiments that need higher accuracy with a reduction in the minimum difference to be detected between the treatments and a consequent increase in the number of samples to be collected.

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Optimal size of experimental plots of papaya trees using a modified maximum curvature method

Cited by 2 publications

References 9 publications

Plot Size and Shape for Field Trials With Forage Cactus Pear

Plot Size and Shape for Field Trials With Forage Cactus Pear

Sampling representativeness of soil carbon and physiological parameters of marandu palisadegrass in a tropical silvopastoral system

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