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## Bragantia

*versão impressa* ISSN 0006-8705*versão On-line* ISSN 1678-4499

#### Resumo

CARGNELUTTI FILHO, Alberto et al. Plot size and number of repetitions in vetch.* Bragantia* [online]. 2017, vol.76, n.2, pp.178-188.
Epub 15-Maio-2017. ISSN 0006-8705. http://dx.doi.org/10.1590/1678-4499.084.

The objectives of this work were to determine the optimum plot size and number of repetitions to evaluate the fresh matter weight of vetch (Vicia sativa L.) in sowing densities. Fortyeight uniformity trials of 6 m × 6 m were conducted. Sixteen trials were evaluated in each sowing density (40, 60, and 80 kg∙ha−1). Each trial was divided into 36 basic experimental units (BEU) of 1 m × 1 m, totaling 1,728 BEU. In each BEU, the fresh matter was weighed. The optimum plot size was determined by the method of maximum curvature of the coefficient of variation model. The means were compared among sowing densities by the Scott-Knott’s test. The number of repetitions — for experiments with completely randomized and randomized block designs, in scenarios of i treatments (i = 3, 4, …, 50) and d minimal differences between treatments means being detected as significant with 5% probability by Tukey’s test, expressed in percentage of the experiment average (d = 10%, 11%, …, 20%), was determined by iterative process until convergence. The optimum plot size to evaluate the fresh matter weight of vetch is 4.52 m2 at the 3 sowing densities. Four repetitions, to evaluate up to 50 treatments, in completely randomized and randomized block designs, are enough to identify as significant, at 5% probability by Tukey’s test, differences between treatment means of 29.15% of the experiment average.

**Palavras-chave
:
***Vicia sativa* L.; uniformity trials; experimental design; cover crops; experimental precision.