THE INFLUENCE OF LIGHT WAVELENGTHS TOWARD THE GROWTH OF BRASSICA RAPA L

• Main Author: MAIZA (NIM : 90216005), RIZKY
• Format: Theses
• Language: Indonesia
• Subjects: Fisika
• Online Access: https://digilib.itb.ac.id/gdl/view/30620
• Institution: Institut Teknologi Bandung

This research aims to analyze the influence of wavelength from light source on growth of Brassica rapa L (pakcoy). The lamps used in the research were 11 watt UV light, 8 watt white LED light, red LED light, green and blue 3 watt LED lights, and 150 watt infrared light, placed in boxes except infrared one. The irradiation was done in the cropping room made from cardboard with size of 23 cm x 27 cm x 40 cm for 9 hours every day. The measurement done was a biometric measurement by measuring stem height, leaves width and their numbers. The observations were done for 14 days starting from the first day of planting. From the measurement result, the pakcoy can grow well on 8 watt white LED light. While in other light sources, it cannot grow well because the wavelength did not fulfill what pakcoy need. Then, the experiment was carried out by combining white LED light with blue, red and UV. The cropping room was made larger with a size of 40 cm x 27 cm x 46 cm. The experimental result showed that all pakcoy plants can grow well. The lighting by using a combination of lights was useful in the development and the growth of pakcoy. From the three treatments, pakcoy with white LED light and UV showed its faster growth for width, length and number of leaves.