THE EFFECT OF THE ADDITION OF Azolla microphylla ON HOAGLAND NUTRIENT SOLUTION TO BIOMASS AND NITRATE ELEMENT UPTAKE OF ROMAINE LETTUCE (Lactuca sativa L. var. longifolia) IN HYDROPONIC DEEF FLOW TECHNIQUE (DFT) SYSTEM

• Main Author: Divakania
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/42887
• Institution: Institut Teknologi Bandung

Deep Flow Technique (DFT) system become a soilless agricultural system easily applied and ideal for romaine lettuce (Lactusa sativa L. var. Longifolia). This vagetable need high nitrogen element during the growing season. The addition of nitrogen element can be done in various ways such as addition of nitrogenated plant on growing media. Based on that, the aim of the research was to evaluate the effect of the addition of nitrogenated plant Azolla microphylla on Hoagland nutrient solution to trigger the romaine lettuce growth. The research was done with a Complete Random Design on romaine lettuce using three different treatments of nutrients consisted full Hoagland (A/control), full Hoagland + Azolla microphylla (B) and Hoagland minus N + Azolla microphylla (C) that was repeated six times. A plant’s biomass measurement is done by measuring the dry weight of crowns and roots using oven, testing nitrate element uptake on romaine lettuce using Kjeldahl and Titrimetry method, and testing nitrtae element on Hoagland using Brusin method. The data processing using one way ANOVA and LSD. The result of this research represent the dry weight of crowns and roots, and nitrate element uptake of romaine lettuce successive of the highest to the lowest are A/control treatment, there are 1,6 gramme/plant, 0,74 gramme/plant, 0,97%, than followed by B treatment are 0,83 gramme/plant, 0,71 gramme/plant, 0,17% and the lowest is C treatment, there are 0,08 gramme/plant, 0,46 gramme/plant, -11%. Based on the result, it can be inferred that add the Azolla microphylla on Hoagland nutrient solution can bring down biomassa of romaine lettuce.