Data/hora: 10/06/2024 15:06:43

Provedor de dados: | 75
País: | Brazil
Título: | Evaluation of crisphead lettuce cultivars in different cover types by manova and discriminant analysis
Autores: | Oliveira,Izabela Regina C de; Rezende,Marcelo T; Dias,Carlos Tadeu dos S; Gomes,Daniela de S; Botrel,Élberis P; Gomes,Luiz Antônio A.
Data: | 2013-09-01
Ano: | 2013
Palavras-chave: | Lactuca sativa; Cover crop; Multivariate analysis; Organic production.
Resumo: | In many agricultural experiments the variables are biologically correlated and it is inappropriate to study them only under univariate analysis. Therefore, we evaluated commercial characteristics of crisphead lettuce cultivars and covers under a multivariate approach, using canonical discriminant analysis. We used a split plot design and we tested the cover crop, cultivar and interaction effects by using MANOVA (α= 5%). Means and its standard errors were obtained for average total weight, weight of the head, volume and density of plants. Canonical discriminant analyses were performed using PROC CANDISC procedure in SAS (SAS Institute, 2008) system. Canonical plots were obtained using JMP 9.0 (SAS Institute, 2010) linked to SAS database. With these plots it was possible to note the differences among factors levels. When polyethylene film was used as cover the plants had inferior commercial characteristics than plants in which cover crops were used. Thus, the cover with polyethylene film can be discouraged in the cultivation of crisphead lettuce, promoting environmental sustainability. We suggest these multivariate techniques in horticulture studies.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362013000300015
Editor: | Associação Brasileira de Horticultura
Relação: | 10.1590/S0102-05362013000300015
Formato: | text/html
Fonte: | Horticultura Brasileira  v.31 n.3 2013
Fonte: | info:eu-repo/semantics/openAccess