RESUMOEvaluating the quality of scions is extremely important and it can be done by characteristics of shoots and roots. This experiment evaluated height of the aerial part, stem diameter, number of leaves, petiole length and length of roots of papaya seedlings. Analyses were performed from a blank trial with 240 seedlings of "Golden Pecíolo Curto". The determination of the optimum plot size was done by applying the methods of maximum curvature, maximum curvature of coefficient of variation and a new proposed method, which incorporates the bootstrap resampling simulation to the maximum curvature method. According to the results obtained, five is the optimal number of seedlings of papaya "Golden Pecíolo Curto" per plot. The proposed method of bootstrap simulation with replacement provides optimal plot sizes equal or higher than the maximum curvature method and provides same plot size than maximum curvature method of the coefficient of variation.
ABSTRACT-Were evaluated three characters in papaya seedlings 'Baixinho de Santa Amália' to estimate the optimum plot size and the number of replications in a completely randomized experiment, a randomized block and Latin square. The characters were seedling height, leaf number and length of roots from uniformity test with 240 seedlings. The determination of the optimum plot size was done by applying the method of Hatheway (1961). The number of seedlings per plot for seedling production is variable depending on the number of treatments and replications assumed precision, the character in question and the experimental design. Comparing designs, the plot size is greater in the Latin square, followed by a randomized block design and completely randomized, and this difference is more pronounced the lower the number of treatments and replicates used. For the same number of treatments and the same precision, the most efficient use of the experimental area is given using smaller plot, with more replications, which require less space in the nursery than larger plots with fewer replications. For experiments completely randomized and randomized blocks with five or more treatments, four replications, and precision of 15% around the mean, it is recommended to use nine seedlings per plot. Index terms: Carica papaya L., experimental precision, experimental planning, design experimental. TAMANHO DE PARCELA NA AVALIAÇÃO DE MUDAS DE MAMOEIRO'BAIXINHO DE SANTA AMÁLIA' EM TUBETES RESUMO-Foram avaliados três caracteres em plântulas de mamoeiro 'Baixinho de Santa Amália' com objetivo de estimar o tamanho ótimo de parcelas e o número de repetições em experimento inteiramente ao acaso, em blocos ao acaso e em quadrado latino. Os caracteres foram altura da plântula, número de folhas e comprimento da maior raiz a partir de ensaio em branco com 240 plântulas. A determinação do tamanho ótimo de parcela foi feita aplicando-se o método de Hatheway (1961). O número de plântulas por parcela para produção de mudas é variável em função do número de tratamentos e de repetições, precisão assumida, do caráter em questão e do delineamento experimental. Na comparação entre delineamentos, o tamanho de parcela é maior no quadrado latino, seguido de blocos ao acaso e inteiramente ao acaso, sendo que esta diferença é mais acentuada quanto menor for o número de tratamentos e de repetições. Para um mesmo número de tratamentos e mesma precisão, o uso mais eficiente de área experimental se dá utilizando-se parcelas menores, com maior número de repetições, as quais demandam menor espaço em viveiro do que parcelas maiores, com menor número de repetições. Para experimentos inteiramente ao acaso e em blocos ao acaso com cinco ou mais tratamentos, quatro repetições, e, precisão de 15% em torno da média, recomenda-se o uso de nove plântulas por parcela. Termos para indexação: Carica papaya L., precisão experimental, planejamento experimental, delineamentos experimentais.
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