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EnglishThis study aimed to verify the influence of the basic experimental unit (BEU) size in the estimation of the optimum plot size to evaluate the fresh matter of sunn hemp (Crotalaria juncea L.) using the modified maximum curvature method. The fresh matter of sunn hemp was evaluated in uniformity trials in two sowing season in flowering. In each sowing season, 4,608 BEUs of 0.5×0.5m (0.25m2) were evaluated and 36 BEU plans were formed with sizes from 0.25 to 16m2. In each evaluation period for each BEU plan, using fresh matter data, optimum plot size was estimated through the modified maximum curvature method. Estimation of the optimum plot size depends on the BEU size. Assessing fresh matter in BEUs that are as small as possible is recommended in order to use it to estimate the optimum plot size. Key words: Crotalaria juncea L.; modified maximum curvature; uniformity trials; experimental planing. portuguesO objetivo deste trabalho foi verificar a influencia do tamanho da unidade experimental basica (UEB) na estimativa do tamanho otimo de parcela, para a avaliacao da massa de materia verde de crotalaria juncea (Crotalaria juncea L.), pelo metodo da maxima curvatura modificado. Avaliou-se a massa de materia verde de crotalaria juncea, no florescimento da cultura, em ensaios de uniformidade conduzidos em duas epocas de semeadura. Em cada epoca foram avaliadas 4.608 UEB de 0,5×0,5m (0,25m2) e formaram-se 36 planos de UEB com tamanhos entre 0,25 e 16m2. Em cada epoca, para cada plano de UEB, com os dados de massa de materia verde, estimou-se o tamanho otimo de parcela, pelo metodo da maxima curvatura modificado. A estimativa do tamanho otimo de parcela depende do tamanho da unidade experimental basica. E indicado avaliar a massa de materia verde em UEB de menor tamanho possivel, para serem usadas na estimacao do tamanho otimo de parcela. Palavras-chave: Crotalaria juncea L.; maxima curvatura modificado; ensaios de uniformidade; planejamento experimental.

Basic experimental unit and plot sizes for fresh matter of sunn hemp