The consumption of vegetables in daily meals can contribute to a healthy life, since the youth. However, there are few studies that aim to identify the students' eating habits regarding potatoes, carrots and beets. In this aspect, the objective was to evaluate the frequency and reason for consumption of potatoes, carrots and beets by students in the Agronomy area, in a public university federal. To that end, a questionnaire composed of objective questions regarding the socioeconomic profile, frequency and eating habits was applied to 32 students. It was observed that most of the students presented a food frequency in relation to potatoes, carrots and beets, with the potato being the most consumed daily. On average, these vegetables are consumed 2 to 4 times a week, with female participants being the most frequent consumers. It was also observed that the taste (28.12%) and nutritional value (35.42%) are the main factors that lead agronomy students to consume the tuberosas, and their consumption is discouraged due to economic reasons, such as high price and market for potato (50.00%) and carrot (31.25%), and for sensorial issues such as appearance (beet and carrot - 31.25%) and flavor (beet - 31.25%).

Regional residues of agricultural, livestock and forestry activities can be used in the formulation of substrates that allow the adequate supply of nutrients in family agricultural production. The objective of this research was to determine the efficiency of different formulations of substrates enriched with babassu biochar for the commercial development of lettuce through sensorial analysis. The experiment was conducted in the period from November 2016 to February 2017. The design was completely randomized, with nine treatments and 15 replicates. Dystrophic Yellow Latosol (dYL), increasing doses of biochar (B); organic fertilizer (OF) and mineral fertilizer (MF) were used in the substrate preparation. The treatments evaluated were: S1 = dYL, S2 = dYL +10 t ha-1B, S3 = dYL +20 t ha-1B, S4 = dYL 30 t ha-1 B, S5 = dYL + 2 t ha-1 OF, S6 = dYL + 5 t ha-1 OF, S7 = dYL +8 t ha-1 OF, S8 = dYL +10 t ha-1 B + 2 t ha-1 OF, S9 = dYL + MF. At 80 days after sowing, sensory analyzes were carried out in order to judge the visual characteristics of the lettuce per treatment. Based on the multicriteria analysis the S4 substrate, the one that contain 30 t ha-1 of biochar proved to be the most successful substrate to comply with the study variables. Thus, the use of biochar can be considered as a viable alternative to mineral fertilizer in terms of sensory analysis.