Optimizing Growth and Nutrient Properties of Red Amaranth Microgreens through Blue Light Duration and Calcium Ascorbate Application

The experiment involved blue light exposure durations (4 hours, 8 hours, and 12 hours) and white light as control. Calcium ascorbate was applied at varying concentrations (10 ppm, and 15 ppm) and water as control. The results revealed that the combination of 4 hours of blue light exposure and 10 ppm calcium ascorbate application significantly increased plant height. Furthermore, 12 hours of blue light exposure led to a thicker and wider cotyledon area, resulting in a deep purple color characteristic of red amaranth microgreens. Fresh weight and dry weight were highest on red amaranth microgreen exposed to 12-hour blue light duration. Shelf life analysis indicated that microgreens grown under 12 hours of blue light exposure with 10 ppm calcium had an extended shelf life at room temperature. Analysis of nutrient content revealed that nitrogen levels were highest in the control group. However, phosphorus content was highest in microgreens exposed to 4 hours of blue light, potassium content was highest in microgreens exposed to 12 hours of blue light. Overall, the combination of 12 hours of blue light exposure and 10 ppm calcium ascorbate application resulted in quality red amaranth microgreens with desirable growth and nutrient properties.