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The aim of this study was to determine the optimum plot size to evaluate the fresh matter of aerial part of dwarf pigeon pea (Cajanus cajan (L.) Millsp), cultivar IAPAR 43 (Aratã), in scenarios formed by combinations of numbers of treatments, number of replications, and precision levels. The fresh matter of aerial part was weighed on basic experimental units of 1 m × 1 m in three uniformity trials with size of 24 m × 12 m (288 m2 in each trial). The soil heterogeneity index of Smith was estimated. Also, the optimum plot size was determined by Hatheway’s method in scenarios formed by combinations of BASIC AREAS Article Plot size related to numbers of treatments and replications, and experimental precision in dwarf pigeon pea Alberto Cargnelutti Filho1*, André Lavezo2, Cláudia Marques de Bem2, Fernanda Carini2, Denison Esequiel Schabarum2, Cirineu Tolfo Bandeira2, Jéssica Andiara Kleinpaul2, Cleiton Antonio Wartha3, Daniela Lixinski Silveira2, Rafael Vieira Pezzini2, Rosana Marzari Thomasi1, Fernanda Martins Simões1, Ismael Mario Márcio Neu2 1.Universidade Federal de Santa Maria Departamento de Fitotecnia Santa Maria (RS), Brazil. 2.Universidade Federal de Santa Maria Programa de Pós-Graduação em Agronomia Santa Maria (RS), Brazil. 3.Universidade Federal de Viçosa Programa de Pós-Graduação em Fitotecnia Viçosa (MG), Brazil. *Corresponding author: alberto.cargnelutti.filho@gmail.com Received: Mar. 15, 2017 – Accepted: May 29, 2017 i treatments (i = 5, 10, 15, and 20), r replications (r = 3, 4, 5, 6, 7 8, 9, and 10), and d precision levels (d = 5%, 10%, 15%, 20%, 25%, and 30%). In experiments designed on randomized block design with 5 to 20 treatments and four replications, plots with 9 m2 were enough to identify significant differences among treatments regarding the fresh matter of aerial part in dwarf pigeon pea at 5% probability of 30% of the experiment overall mean.