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Ciência Rural

Print version ISSN 0103-8478

Abstract

CARGNELUTTI FILHO, Alberto et al. Sample size to estimate the average of morphological and productive traits of turnip. Cienc. Rural [online]. 2014, vol.44, n.2, pp.223-227. ISSN 0103-8478.  http://dx.doi.org/10.1590/S0103-84782014000200005.

The aim of this research was to determine the sample size to estimate the average of morphological and productive traits of turnip (Raphanus sativus L.). In a experiment, 300 plants were randomly selected and measured for morphological traits (plant height and number of leaf at 21, 35, 48, 55, 62, 70, 77 and 91 days after sowing) and productive (fresh and dry matter of roots, stem, leaf and total of 91 days after sowing). Measures of central tendency and variability were calculated, normality was checked and the sample size was calculated. The sample size of productive traits is greater than morphological to estimate average and it has the same precision. For the morphological and productive traits studied 231 plants are enough to predict the average, with an estimation error maximum of 10% of estimated average, with a degree confidence of 95%.

Keywords : Raphanus sativus L.; experimental planning; sampling.

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