Information from all plants in a row are usually collected in greenhouse experiments. This increases experimental cost, labor, time and space for collecting data from all plants and fruits. The sample size and sampling method for sweet pepper experiments in greenhouse were determined, during winter-spring of 2000 and summer-fall of 2001. The greenhouse was located at the Universidade Federal de Santa Maria, Brazil. The experiment was conducted with ten rows of 23 m length with 72 plants per row. Fresh fruit weight variances were heterogeneous among rows for each cultivation season, between the two seasons. The sample sizes estimated for the winter-spring and summer-fall seasons were, respectively, 56 and 50 plants per row in each crop with 95% of confidence.
Capsicum annuum; sample size; protected environment
