Variability, plot size and border effect in lettuce trials in protected environment

Abstract

The variability within rows of cultivation may reduce the accuracy of experiments conducted in a complete randomized block design if the rows are considered as blocks, however, little is known about this variability in protected environments. Thus, our aim was to study the variability of the fresh mass in lettuce shoot, growing in protected environment, and to verify the border effect and size of the experimental unit in minimizing the productive variability. Data from two uniformity trials carried out in a greenhouse in autumn and spring growing seasons were used. In the statistical analyses, it was considered the existence of parallel cultivation rows the lateral openings of the greenhouse and of columns perpendicular to these openings. Different scenarios were simulated by excluding rows and columns to generate several borders arrangements and

Calculation of the ideal plot size for experiments using eucalyptus

“…Cargnelutti Filho et al (2011), Morais et al (2014), Padrón et al (2018) and Santos et al (2018), used the method of maximum modified curvatures for maize, tissue vines, pepper and lettuce cultures, while Rodríguez et al (2018) used the same method for sweet potato culture, demonstrating that this is an well established method.…”