Variação temporal do tamanho de amostra para experimentos em estufa plástica

ABSTRACT

The present work had as objective to estimate the sample size in each crop, for experiments accomplished in plastic greenhouse with the culture of the cucumber of the type conserves, cultivate Mandarina, in which the weight of the total fresh mass of the fruits was evaluated. The cultivation was accomplished in the area of the Department of Fitotecnia - UFSM and it was constituted of six lines with twelve portions of five plants in each line. The test of Bartlett was applied to verify the homogeneity of the variances among the crops and among the lines inside of each crop. It was verified that in 7 of the 13 crops, the variances among the lines came homogeneous. The sizes of samples found among all the portions were 44 and 22 portions and 10 and 11 portions for line for the semi-widths of the average of 10 and 20%, respectively, to 5% of error probability.

RESUMO

O trabalho teve como objetivo estimar o tamanho de amostra em cada colheita, para experimentos realizados em estufa plástica com a cultura do pepineiro do tipo conserva, cultivar Mandarina, na qual se avaliou a da massa da matéria fresca total dos frutos. O cultivo foi realizado na área do Departamento de Fitotecnia - UFSM e se constituiu de seis linhas com doze parcelas de cinco plantas em cada linha. Aplicou-se o teste de Bartlett para verificar a homogeneidade das variâncias entre as colheitas e entre as linhas dentro de cada colheita. Verificou-se que, em 7 das 13 colheitas, as variâncias entre as linhas se apresentaram homogêneas. Os tamanhos de amostras encontrados entre todas as parcelas foram 44 e 22 parcelas e 10 e 11 parcelas por linha para as semi-amplitudes da média de 10 e 20%, respectivamente, a 5% de probabilidade de erro.