Abstract
ABSTRACT The square lattice 4x4 design was compared to a randomized block design, for carrot F1 hybrids. Sixteen experimental carrot hybrids were evaluated in Brasília, in 2014/15 and 2015/16 agricultural years. A square lattice 4x4 design with three replications was used. The experimental plot consisted of 1.5 m2 useful area. The experimental area was installed on the second half of November 2014 and 2015. Cultural practices were the usually given to the carrot crop in Brazilian savannah region. The incidence of leaf blight was evaluated 90 days after sowing date and, after 100 days, roots were harvested and yield components evaluated. We evaluated the three possible analyses in lattice: 1) as randomized block design; 2) intrablock analysis with adjusted treatments and blocks within unadjusted repetitions; 3) analysis with recovery of interblock information with adjusted treatments. The analysis in lattice permitted to reduce the mean squares of error and coefficients of variation; moreover, these were more efficient than the randomized block design experiments for most evaluated characters. Thus, use of the analysis in lattice is preferred in experiments with carrot when evaluating large number of treatments.
Highlights
Comparou-se o delineamento em látice quadrado 4x4 ao de blocos ao acaso para híbridos F1 de cenoura
An alternative for greater local control is the use of incomplete blocks, square latices
The use of lattice designs is common in experiments with corn or soybeans, Hortic. bras., Brasília, v.36, n.2, April - June 2018 since they usually require the evaluation of large number of genotypes, either for cultivar release or for evaluation of many genotypes generated in large diallel crosses or, in the evaluation of tens or hundreds progenies in recurrent selection programs
Summary
Comparou-se o delineamento em látice quadrado 4x4 ao de blocos ao acaso para híbridos F1 de cenoura. The use of complete randomized block design for local control, is common, considering environmental homogeneity within each replication. Bras., Brasília, v.36, n.2, April - June 2018 since they usually require the evaluation of large number of genotypes, either for cultivar release or for evaluation of many genotypes generated in large diallel crosses or, in the evaluation of tens or hundreds progenies in recurrent selection programs. In greenhouses these designs are rarely used, except for potatoes (Bearzoti et al, 1997). Methodologies for these analyzes are described in Pimentel-Gomes (2009)
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