Abstract
ABSTRACT The objective of this study was to evaluate the growth of crisp lettuce in hydroponic cultivation, following the nutrient film technique (NFT), using optimized mineral and organomineral nutrient solutions. The experiment was set in 8 x 3 factorial scheme, with treatments distributed in randomized blocks and split plots, with three replicates. The plots corresponded to eight nutrient solutions, of which four were mineral solutions with chemical composition suggested by Bernardes, Furlani, Castellane & Araújo and Ueda, and four were organomineral solutions, suggested by this research with chemical composition similar to those of the previously mentioned mineral solutions. The subplots corresponded to three varieties of crisp lettuce: Thaís, Vanda and Verônica. At 25 days after transplanting, the following parameters were evaluated: stem and crown diameter, root length, leaf area and number of leaves. For stem and crown diameters and number of leaves, the mineral solutions promoted the highest means. The mineral solution of Furlani and the organomineral solutions, except the modified solution of Castellane & Araújo, promoted the greatest root lengths. The smallest leaf area was obtained in the organomineral solution of Ueda. The cultivar Verônica had the highest root length and stem diameter.
Highlights
The consumption of vegetables has increased due to the population growth, and because of the trend of change in the food habit of the consumer, making inevitable the need to increase production
This study aimed to evaluate the growth of hydroponic lettuce cultivated with different mineral and organomineral solutions optimized using the Solver tool of the Microsoft Office Excel
Except for the modified solution of Ueda (UO), the cultivar Verônica showed the highest means of crown diameter (CD), but without differing statistically from the cultivar Vanda with the use of the modified solution of Bernardes (BO), mineral solutions of Furlani (FM) and Castellane & Araujo (CM) and from the cultivar Thaís with the use of the mineral solution of Ueda (UM)
Summary
The consumption of vegetables has increased due to the population growth, and because of the trend of change in the food habit of the consumer, making inevitable the need to increase production. Various studies have already been conducted with the cultivation of this vegetable using the technique of hydroponics, such as Magalhães et al (2010), Paulus et al (2012) and Sarmento et al (2014). In the last years a few studies on the use of biofertilizer in the production of hydroponic lettuce have been conducted, such as Costa et al (2006), Dias et al (2009) and Monteiro Filho et al (2014)
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