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      Experimental dimensions and precision in trials with millet and slender leaf rattlebox Translated title: Dimensionamentos experimentais e a precisão em ensaios com milheto e crotalária ochroleuca

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          Abstract

          ABSTRACT - The objective of this study was to determine the optimal plot size to evaluate fresh matter in millet (Pennisetum glaucum L.) and slender leaf rattlebox (Crotalaria ochroleuca), in scenarios formed by combinations of numbers of treatments, numbers of replicates, and levels of precision. Fifteen uniformity trials with millet and slender leaf rattlebox, in single cropping or intercropping, were carried out. Fresh matter was evaluated in 540 basic experimental units (BEU) of 1 m × 1 m (15 trials × 36 BEU per trial). The soil heterogeneity index of Smith (1938) was estimated. Plot size was determined by the method of Hatheway (1961) in scenarios formed by combinations of i treatments (i = 5, 10, 15 and 20), r replicates (r = 3, 4, 5, 6, 7 and 8), and d precision levels (d = 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18% and 20%). To evaluate the fresh matter of millet and slender leaf rattlebox, in single or intercropping, in experiments in completely randomized or randomized block designs, with 5 to 20 treatments and with five replicates, plots with 10 m² of usable area are sufficient for differences between treatments of 10% of the overall mean of the experiment to be considered significant at 0.05 probability level.

          Translated abstract

          RESUMO - O objetivo deste trabalho foi determinar o tamanho ótimo de parcela para avaliar a massa de matéria fresca de milheto (Pennisetum glaucum L.) e de crotalária ochroleuca (Crotalaria ochroleuca) em cenários formados por combinações de números de tratamentos, números de repetições e níveis de precisão experimental. Foram conduzidos 15 ensaios de uniformidade com milheto e crotalária ochroleuca, em cultivo solteiro e em consórcio. Foi avaliada a massa de matéria fresca em 540 unidades experimentais básicas (UEB) de 1 m × 1 m (15 ensaios × 36 UEB por ensaio). Foi estimado o índice de heterogeneidade do solo de Smith (1938). Foi determinado o tamanho de parcela por meio do método de Hatheway (1961) em cenários formados pelas combinações de i tratamentos (i = 5, 10, 15 e 20), r repetições (r = 3, 4, 5, 6, 7 e 8) e d níveis de precisão (d = 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18% e 20%). Para avaliar a massa de matéria fresca de milheto e de crotalária ochroleuca, em cultivo solteiro ou em consórcio, nos delineamentos inteiramente casualizado ou de blocos completos ao acaso, com 5 a 20 tratamentos e com cinco repetições, parcelas de 10 m² de área útil são suficientes para que diferenças entre tratamentos de 10% da média geral do experimento sejam consideradas significativas a 0.05 de probabilidade.

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          Köppen's climate classification map for Brazil

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            An empirical law describing heterogeneity in the yields of agricultural crops

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              Convenient plot size

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                Author and article information

                Journal
                rca
                Revista Ciência Agronômica
                Rev. Ciênc. Agron.
                Universidade Federal do Ceará (Fortaleza, CE, Brazil )
                0045-6888
                1806-6690
                2021
                : 52
                : 3
                : e20207434
                Affiliations
                [2] Santa Maria Rio Grande do Sul orgnameUniversidade Federal de Santa Maria orgdiv1Department of Plant Sciences Brazil alberto.cargnelutti.filho@ 123456gmail.com
                [4] Santa Maria Rio Grande do Sul orgnameUniversidade Federal de Santa Maria orgdiv1Graduate in Agronomy Brazil felipe-somavilla@ 123456hotmail.com
                [3] Santa Maria-RS Rio Grande do Sul orgnameUniversidade Federal de Santa Maria orgdiv1Postgraduate Program in Agronomy Brazil
                Article
                S1806-66902021000300412 S1806-6690(21)05200300412
                10.5935/1806-6690.20210045
                7dd66d80-1e38-4300-9710-8fb695b2e7bd

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 29 May 2020
                : 10 September 2020
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 30, Pages: 0
                Product

                SciELO Brazil

                Categories
                Scientific Article

                Soil cover crop,Uniformity trial,Optimal plot size,Pennisetum glaucum L,Crotalaria ochroleuca,Cultura de cobertura de solo,Ensaio de uniformidade,Tamanho ótimo de parcela

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