Abstract

The study aimed to determine the microbiological quality for coliform in three lettuce cultivars grown hydroponically with optimized solutions. The study was conducted in a protected environment and driven in a hydroponic system adopting the technique of laminar flow nutrientes-NFT, on the premises of the State University of Paraíba-Campus II in Lagoa Seca, PB having the following coordinates: 7°10′15″S; 35°51′14″W. The experimental design was a randomized block with a split-plot treatment in 7 × 3 factorial, with three replicates whose factors were 7 hydroponic solutions with three lettuce cultivars. The optimized solutions were formulated taking as reference the nutrient solution Furlani. The plot was constituted by nutrient solution (S). S1 = Furlani solution; S2 = domestic wastewater; S3 = optimized domestic wastewater; S4 = well water; S5 = optimized well water; S6 = wastewater from the UASB reactor and S7 = optimized wastewater from the UASB reactor and as for the subplot the three lettuce cultivars (Thais, Vanda and Veronica). In none of the samples of the three lettuce cultivars in the first experiment did the microbiological quality increase at 45°C, by the Most Probable Number (MPN) table, when the tube combination was 0-0-0, that is, without growth in none of the tubes, it is assumed that the MPN is less than 1.8 μg. ll samples were considered acceptable for the microbiological standard of thermotolerant coliforms at 45 °C/g. The leaf chlorophyll content is positively correlated with the N content in the plant.

Highlights

  • The vegetables in general are essential and take a expressive part of the diet on a significant amount of the world’s population

  • The study was conducted in a protected environment and driven in a hydroponic system adopting the technique of the laminar flow of nutrients (NFT) in the facilities of the State University of Paraíba-UEPB campus II in Lagoa Seca PB having the following coordinates: 7°10′15′′S; 35°51′14′′W at an altitude of 634meters, climate characterized as tropical humid (s’), with an average annual temperature around 22 °C, minimum 18 °C and maximum 33°C according to the climate classification Koppen adapted to Brazil (1971)

  • The analysis of the microbiological quality of the three cultivars of lettuce as in the first experiment can be seen in Table 5 in the samples was no growth at 45 °C, by Most Probable Number table (MPN), when the combination of the tubes is 0-0-0, or no growth on any of the tubes, it is assumed that the MPN is less than 1.8/g

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Summary

Introduction

The vegetables in general are essential and take a expressive part of the diet on a significant amount of the world’s population. They are usually consumed “in natura” and, without washing and appropriate sanitary control, serves as transmitters of disease-causing by pathogenic microorganisms (Itohan et al, 2011). The sanitary quality of lettuce irrigated with recycled water samples was compared with marketed in work Varallo et al (2011). Microbiological contamination may occur in lettuce before and after harvest, through contact with soil, contaminated irrigation water, and by the hands of transport handles (Constantin et al, 2013)

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