Abstract
ABSTRACT Nitrogen (N) is the second most accumulated nutrient in rocket. This nutrient greatly affects growth, productivity and quality of the vegetable. Rocket is the second most widely grown leafy vegetable in hydroponic system; however, no studies on how N concentration in nutrient solution affects this crop can be found in literature. We studied four concentrations (79.2; 118.8; 158.4 and 237.6 mg L-1 of N) in a randomized block design with five replicates. Maximum number of leaves, leaf area, dry mass and productivity of rocket cv. ‘Folha larga’ were obtained with the highest N concentration. The rocket quality, evaluated by the nitrate content, was maximum with 210.2 mg L-1 of N and its value in the concentration which maximized productivity is in the acceptable range for vegetables; so, it is recommended to grow rocket with 237.6 mg L-1 of N in the nutrient solution.
Highlights
O nitrogênio (N) é o segundo nutriente mais acumulado pela rúcula, o qual afeta sobremaneira o crescimento, produtividade e qualidade desta hortaliça
This study aimed to evaluate the effect of N concentration in the nutrient solution regarding productivity and quality of rocket grown under hydroponic system
Leaf area and shoot dry mass positively responded to the increase of N concentration in the nutrient solution, using linear equation adjustment, whereas plant height showed the maximum value (37.7 cm) with 229.5 mg L-1 of N (Figure 1)
Summary
O nitrogênio (N) é o segundo nutriente mais acumulado pela rúcula, o qual afeta sobremaneira o crescimento, produtividade e qualidade desta hortaliça. Seu valor na concentração que maximizou a produtividade encontra-se na faixa aceitável para hortaliças; de modo que se recomenda o cultivo da rúcula com 237,6 mg L-1 de N na solução nutritiva. Considering the leafy vegetables, rocket is the second most cultivated under hydroponic system, being lettuce the first one (Matos et al, 2016). The nutrient solutions must have very high nitrogen (N) concentrations (Urlić et al, 2017). Considering the nutrients, N is an extremely important one, as it is the second most accumulated nutrient in rocket (Grangeiro et al, 2011), showing effect on growing and productivity, as well as on quality (Petropoulos et al, 2016). Researches about N for the rocket crop under soil-free cultivation system are still scarce, but studies on field conditions are common, though (Steiner et al, 2011; Yoruk et al, 2018; Barros Júnior et al, 2020; Silva et al, 2020)
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