Tamanho ótimo de parcela para avaliação da massa e diâmetro de cabeças de brócolis

Brum, Betânia; Brandelero, Fernanda Daniela; Vargas, Thiago de Oliveira; Storck, Lindolfo; Zanini, Pedro Paulo Gonçalves

doi:10.1590/0103-8478cr20150236

Cited by 11 publications

(13 citation statements)

References 12 publications

(17 reference statements)

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“…Plot arrangement influenced the experimental precision, i.e., plots with greater dimension and perpendicularly located to the plant rows, regardless of shape, usually have lower coefficients of variation. This was also reported by DONATO et al (2008) andBRUM et al (2016), who calculated the optimal plot size in bananas and broccoli, respectively, observed a decrease in CV with a differentiated rate of decrease and an increase in plot size. Figure 1 shows that the estimates of optimal plot size (x 0 ) for the morpho-agronomic traits ranged from x 0 = 1.64 bu, approximately x 0 = 2 bu for the precocity character (PREC) to x 0 = 6.46 bu (7 bu) for the number of commercial fruits per plant at nine months (NCF9) character.…”

Section: Resultssupporting

confidence: 83%

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

Silva

Donato

et al. 2019

Cienc. Rural

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This study aimed to evaluate the optimum plot size for the papaya crop by using the modified maximum curvature method under soil and climatic conditions of the Recôncavo Baiano. The experiment comprised a uniformity test using the CNPMF-L78 strain developed by Embrapa Mandioca and Fruticultura, planted at a spacing of 3 m x 2 m, with 16 central rows and 22 plants per row, totaling 352 plants and an area of 2,112 m2. The following parameters were evaluated: plant height and diameter; height of insertion of the first fruits; precocity; number of commercial fruits per plant; productivity; length, diameter, weight, firmness, internal cavity diameter, pulp thickness, and soluble fruit solids. Each plant was considered as a basic unit, with an area of 6 m2, thus making up 352 basic units whose adjacent units were combined to form 11 pre-established parcel arrangements with rectangular and row formats. The optimal plot size is seven plants perpendicular to the crop rows, that is, seven rows with one plant in each row, corresponding to the area of 42 m2, considering spacing of 3 m between rows and 2 m between papaya plants in the soil and climatic conditions of the Recôncavo Baiano.

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Section: Resultssupporting

confidence: 83%

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

Silva

Donato

et al. 2019

Cienc. Rural

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“…The CV Xo to optimum plot size ranged from 8% for aerial part height to 20% for root dry matter. Similar results were verified by Brum et al (2016) in the evaluation of two characteristics in broccoli using Paranaíba et al's (2009) method. Such a behavior is explained due to the fact that the CV Xo is dependent on X 0 , as can be seen in the equation 3 for Meier and Lessman's (1971) To emphasize the importance of the results, the characteristic root dry matter is taken as basis, using the equation 5 and classification of CV according Pimentel-Gomes (2009) which considers as low values up to 10%, average values between 10 and 20%, high to values between 20% and 30% and very high values above 30%.…”

Section: Resultssupporting

confidence: 81%

“…From 128 cells containing three seeds, four cells only did not show formation of seedling. For purpose of this research, the values of the missing cells were obtained by mean of the two neighboring seedlings in the row, as recommended by Brum, Brandelero, Vargas, Storck, and Zanini (2016). Therefore, for low frequency of fault and good development of seedlings, the data obtained are suitable for study proposed.…”

Section: Resultsmentioning

confidence: 99%

Comparison of Methodologies to Determine the Optimum Plot Size for Okra Seedlings Evaluation

Santos¹,

Pinto²,

Almeida³

et al. 2019

JAS

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The production of okra using seedlings is a practice increasingly used by farmers. However, this system still lacks further research involving substrates, tray types, cell volume, pest control and disease. For this it is important to determine the optimum size of the plots, in order to reduce the experimental errors and the expenses with the experiment. The objective of this work was to determine the optimum plot size for experiments involving okra seedlings produced in Styrofoam trays of 128 cells using different methods. The methods were the maximum curvature, the maximum curvature with bootstrap simulation and the maximum curvature of the coefficient of variation. The evaluated characteristics were aerial part height, stem diameter, aerial dry matter, root dry matter, total dry matter and quality of seedlings as measured by Dickson quality index. The results showed that the optimum plot size is different between the evaluated characteristics and for characteristics there is no significant difference in the optimum plot size between the three different methods. The optimum size for evaluating okra seedlings produced in Styrofoam trays of 128 cells is 10 seedlings per plot and is indicated the use of the maximum curvature method using a bootstrap simulation.

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“…According to [31], experimental units with up to 20 BUs (12.00 m²) can be used as basic units of practical size and therefore used for discussion purposes. We verified that to detect a 10% difference between averages of cultivars, it is possible obtaining plots of practical size with CV up to 18%, except for 4, 8, and 12 cultivars combined with three for the CV of 24%, using 4, 8, 12, and 16 treatments with seven replicates and for the CVs of 30 and 41.86% (CV of one BU) none combinations should be recommended.…”

Section: Discussionmentioning

confidence: 99%

Optimum Size and Shape of Experimental Units for Cassava Cropping

Assis

Rodrigues

Linhares

et al. 2019

JEAI

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In agricultural experimentation, the right size and shape of experimental units increase the precision of the experiment. This study determines the optimum size and shape of the experimental unit for field experimentation with cassava. For this, we carried out a uniformity test in Pacajús, Ceará, under dry conditions, with the cultivar 'Mastruço' planted at a spacing of 1.00 m x 0.60 m. The root yields were collected in 15 rows with 40 plants each, comprising 31 types of experimental units of 23 different pre-established sizes. The optimum size of the experimental unit was estimated by the Hatheway method, and the shape was determined by the relative information method. The Hatheway method indicated several optimum sizes of experimental units, many of which were applicable for evaluation experiments of cassava cultivars. The 15 x 1 rectangular experimental unit (15 rows with one plant and 9.00 m² of useful area) was considered the ideal shape for assessment of cassava production, which was smaller than the size suggested in surveys with of cassava cropping. There was a continuous nonlinear reduction of the coefficient of variation with the increase in plot size.

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Tamanho ótimo de parcela para avaliação da massa e diâmetro de cabeças de brócolis

Abstract: RESUMO O objetivo deste trabalho foi determinar o tamanho ótimo de parcela (Xo), por amostragem na área total e nas frações de áreas, a fim de avaliar a massa e o diâmetro

Cited by 11 publications

References 12 publications

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

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

Comparison of Methodologies to Determine the Optimum Plot Size for Okra Seedlings Evaluation

Optimum Size and Shape of Experimental Units for Cassava Cropping

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