Abstract
Growth, mineral content and antioxidant activity of romaine lettuce in relation to development stage in soilless system
Highlights
In recent years, there had been an increased focus on vegetable production and marketing with regard to quality and produce safety (Hewett, 2006; Kader, 2008; Petropoulos et al, 2018)
The average plant weights and number of leaves per plant were significantly influenced by harvesting stage when these attributes increased with plant development and their highest values attained at the third growth stage (56 days after planting (DAP)) (Table 1)
Harvesting at 42 and 56 DAP resulted in 142 and 250% higher lettuce fresh weight compared to early harvesting at 28 DAP (Table 1)
Summary
There had been an increased focus on vegetable production and marketing with regard to quality and produce safety (Hewett, 2006; Kader, 2008; Petropoulos et al, 2018). Longifolia) is an important leafy vegetable all over the world, which normally consumed raw as salad or as ready-to-eat produce. Lettuce leaves is a good source of minerals, such as calcium (Ca), phosphorous (P), magnesium (Mg), and potassium (K) (Conversa et al, 2004; Kim et al, 2016). As consumer preferences for normally consumed raw or ready-to eat vegetables are driven by their visual appearance of product (e.g., mini-sized heads of lettuce) which might push farmers to harvest head lettuce at a smaller and immature stage (Gil et al, 2012). We need to have a successful strategy of cultivation (e.g., optimum growth stage) that enhance biomass, chemical composition and nutritional value and attain consumer’s acceptance
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