Abstract
ABSTRACT: The objectives of this study were to fit the Gompertz and Logistic models for the fresh and dry matter of leaves and the fresh and dry matter of shoots of three lettuce cultivars and indicate the best model to describe their growth in autumn-winter. The lettuce cultivars Gloriosa, Pira Verde, and Stella were evaluated in the autumn-winter of 2016 and 2017, in soilless in a protected environment. After transplantation, the fresh and dry matter of leaves and shoots were weighed every seven days. These dependent variables were fit using the accumulated thermal sum. The parameters of the Gompertz and Logistic models were estimated, the assumptions of the models were verified, the indicators of fit quality and critical points were calculated and the parametric and intrinsic curvature measures quantified. The Logistic and Gompertz models presented a satisfactory adjustment for the fresh and dry matter of leaves and the fresh and dry matter of shoots, for the lettuce cultivars Gloriosa, Pira Verde and Stella, in autumn-winter. The Logistic model best describes the growth of the lettuce cultivars.
Highlights
Lettuce (Lactuca sativa L.) is a temperate leafy green vegetable (SALA & COSTA, 2012)
The assumptions of normality, homogeneity, and independence of errors were met in both the Gompertz and Logistic models for fresh and dry matter of leaves and fresh and dry matter of shoots of lettuce cultivars in both experiments, as the Shapiro-Wilk, Durbin-Watson, and BreuschPagan tests had p-values equal to or greater than 0.05
The estimate of parameter c, represents the growth speed, which was higher in the Logistic model (Tables 1 and 2)
Summary
Lettuce (Lactuca sativa L.) is a temperate leafy green vegetable (SALA & COSTA, 2012). Its leaves are consumed as raw salads, soups, and creams, and is a source of dietary fibers, vitamins, and minerals (NTSOANE et al, 2016). It is the main leafy green vegetable sold and consumed in Brazil, mainly because of its ease of production and acquisition. Lettuce cultivars are classified as crisphead, iceberg, or butterhead and other types (‘mimosa’, romaine, baby, and purple), corresponding to 43.3%, 41.2%, 5.0% and 10.5%, respectively, of the lettuce traded at the General Warehousing Company of São Paulo (CEAGESP, 2017).
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
