Experimental dimensions and precision in trials with millet and slender leaf rattlebox

Alberto Cargnelutti Filho, Ismael Mario Márcio Neu, Marcos Vinícius Loregian, Valéria Escaio Bubans, Felipe Manfio Somavilla, Gabriel Elias Dumke

Resumo


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.

Palavras-chave


Pennisetum glaucum L. Crotalaria ochroleuca. Soil cover crop. Uniformity trial. Optimal plot size.

Texto completo:

PDF (English)

Referências


ALVARES, C. A. et al. Köppen’s climate classification map for Brazil. Meteorologische Zeitschrift, v. 22, n. 6, p. 711-728, 2013.

ASCARI, J. P. et al. Influence of biological fertilizer and plant cover in the physical properties of soil. Revista Agrarian, v. 13, n. 47, p. 42-55, 2020.

BURIN, C. et al. Plot size and number of replicates in times of sowing and cuts of millet. Revista Brasileira de Engenharia Agrícola e Ambiental, v. 20, n. 2, p. 119-127, 2016.

BURIN, C. et al. Tamanho de parcela e número de repetições na cultura do milheto em épocas de avaliação. Bragantia, v. 74, n. 3, p. 261-269, 2015.

CARGNELUTTI FILHO, A. et al. Optimal plot size for experiments with black oats and the common vetch. Ciência Rural, v. 50, n. 3, p. e20190123, 2020.

CARGNELUTTI FILHO, A. et al. Planejamentos experimentais em nabo forrageiro semeado a lanço e em linha. Bioscience Journal, v. 30, n. 3, p. 677-686, 2014a.

CARGNELUTTI FILHO, A. et al. Plot size related to numbers of treatments, repetitions, and the experimental precision in flax. Comunicata Scientiae, v. 9, n. 4, p. 629-636, 2018.

CARGNELUTTI FILHO, A. et al. Tamanho de parcela para avaliar a massa de plantas de mucuna cinza. Comunicata Scientiae, v. 5, n. 2, p. 196-204, 2014b.

DEBIASI, H. et al. Práticas culturais na entressafra da soja para o controle de Pratylenchus brachyurus. Pesquisa Agropecuária Brasileira, v. 51, n. 10, p. 1720-1728, 2016.

DONATO, S. L. R. et al. Experimental planning for the evaluation of phenotipic descriptors in banana. Revista Brasileira de Fruticultura, v. 40, n. 5, p. 1-13, 2018.

FACCO, G. et al. Basic experimental unit and plot sizes for fresh matter of sunn hemp. Ciência Rural, v.48, n.5, p. e20170660, 2018.

FACCO, G. et al. Basic experimental unit and plot sizes with the method of maximum curvature of the coefficient of variation in sunn hemp. African Journal of Agricultural Research, v. 12, n.6, p. 415-423, 2017.

FERREIRA, N. M. et al. Potential of species of green coverage in Entisol. Journal of Agricultural Science, v. 11, n. 11, p. 263-273, 2019.

GUIMARÃES, B. V. C. et al. Methods for estimating optimum plot size for ‘Gigante’ cactus pear. Journal of Agricultural Science, v. 11, n. 14, p. 205-211, 2019.

GUIMARÃES, B. V. C. et al. Optimal plot size for experimental trials with Opuntia cactus pear. Acta Scientiarum. Technology, v. 42, p. e42579, 2020.

HATHEWAY, W. H. Convenient plot size. Agronomy Journal, v. 53, n. 4, p. 279-280, 1961.

LIN, C. S.; BINNS, M. R. Relative efficiency of two randomized block designs having different plot sizes and numbers of replications and of plots per block. Agronomy Journal, v. 78, n. 3, p. 531-534, 1986.

MAYOR-DURÁN, V. M.; BLAIR, M.; MUÑOZ, J. E. Metodología para estimar el coeficiente de heterogeneidad del suelo, el número de repeticiones y el tamaño de parcela en investigaciones con frijol (Phaseolus vulgaris L.). Acta Agronomica, v. 61, n. 1, p. 32-39, 2012.

MEIER, V. D.; LESSMAN, K. J. Estimation of optimum field plot shape and size for testing yield in Crambe abyssinica Hochst. Crop Science, v. 11, n. 5, p. 648-650, 1971.

NASCENTE, A. S.; STONE, L. F. Cover crops as affecting soil chemical and physical properties and development of upland rice and soybean cultivated in rotation. Rice Science, v. 25, n.6, p. 340-349, 2018.

PARANAÍBA, P. F.; FERREIRA, D. F.; MORAIS, A. R. Tamanho ótimo de parcelas experimentais: proposição de métodos de estimação. Revista Brasileira de Biometria, v. 27, n. 2, p. 255-268, 2009.

PASSOS, A. M. A. et al. Effect of cover crops on physico-chemical attributes of soil in a short-term experiment in the southwestern Amazon region. African Journal of Agricultural Research, v. 12, n. 47, p. 3339-3347, 2017.

PFÜLLER, E. E. et al. Aspectos fenológicos e produtividade de espécies de verão para cobertura de solo em Vacaria, RS. Investigación Agraria, v. 21, n.1, p.23-30, 2019.

PIMENTEL-GOMES, F. Curso de estatística experimental. Piracicaba, SP: FEALQ, 2009. 451 p.

SANTOS, H. G. et al. Sistema Brasileiro de Classificação de Solos. Brasília, DF: Embrapa, 2018. 356 p.

SMITH, H. F. An empirical law describing heterogeneity in the yields of agricultural crops. Journal of Agricultural Science, v. 28, n. 11, p. 1-23, 1938.

SOUSA, D. C. et al. Chemical attributes of agricultural soil after the cultivation of cover crops. Australian Journal of Crop Science, v.11, n.11, p. 1497-1503, 2017.

SOUSA, R. P. et al. Optimum plot size for experiments with the sunflower. Revista Ciência Agronômica, v. 46, n. 1, p. 170-175, 2015.

SOUSA, R. P.; SILVA, P. S. L.; ASSIS, J. P. Tamanho e forma de parcelas para experimentos com girassol. Revista Ciência Agronômica, v. 47, n. 4, p. 683-690, 2016.

VUICIK, E. et al. Plantas de cobertura na entressafra das culturas da soja e trigo. Revista Cultivando o Saber, v. 9, n. 3, p. 266-273, 2018.




Revista Ciência Agronômica ISSN 1806-6690 (online) 0045-6888 (impresso), Site: www.ccarevista.ufc.br, e-mail: ccarev@ufc.br - Fone: (85) 3366.9702 - Expediente: 2ª a 6ª feira - de 7 às 17h.