EVALUATIONS OF GROWTH AND NUTRITIONAL PROFILE OF MICROGREENS OF DIFFERENT CROPS UNDER VARIOUS LEDs LIGHT SPECTRUMS

Abstract

This present study was conducted at an indoor structure on the 5 floor of Dr. Wazed Mia Research Centre, Sher-e-Bangla Agricultural University, Dhaka. During the period from November to December, 2020. The experiment comprised of single factors that is viz., Five different concentrations of LEDs light (White light L 1 II : 100; Red light L 2 : 100; Blue light L 3 : 100; Red: Blue light L 4 th : 70:30 and Red: Green: Blue light L 5 : 70:10:20). Four different crops (C 1 : Mustard, C 2 : Lettuce, C 3 : Broccoli) were used as microgreen crops. Results showed that the highest hypocotyl length of C 1 , C 2 , C 3 and C 4 were (10.53cm, 8.47cm, 15.23cm and 11.43cm) from the treatment of L 4 C 1 , L 4 C 2, L 4 C 3, and L 4 C 4 whereas the lowest (7.67 cm, 5.53 cm, 11.2 cm and 7.73 cm) were found from the control treatment L 1 L 4 C 3, and L 4 C 1 C 4 , L 1 C 2 L 1 C 3 and L 1 C 4 respectively. Treatment of L 4 registered the highest fresh weight of C 1 , C 2 , C 3 (0.1, 0.1, 0.1 and 0.1kg) and yield (0.115, 0.110, 0.135 and .125kg). The treatment L 4 C 1 , L 4 C 2, L 4 C 3, and L 4 C 4 gave the highest SPAD value C 1

(16.9nm), C 3 (55.3nm) and C 4 (49.9nm), nitrogen (%) of C 1

(16.93%), C 3 (55.27%) and C 4 (93.93%), potassium (%) of C 1 (0.19%), C 2 (0.19%), C 3 (0.22%), C 2 (0.22%) and C 4 (0.23%), C 3 : Radish, C 4 C 1 and C 4 , L 4 (38.2nm), C 2 (38.23%), C 2 (0.16%) and antioxidant capacity of C 1 (0.19%) and C 4 (0.18%). The highest and lowest gross income was obtained from L 4 C 1 , L 4 C 2, L 4 C 3, and L 4 C 4 treatment and L 1 C 1 , L 1 C 2 L 1 C 3 and L 1 C 4 treatment. The highest (4.1, 3.9, 4.9 and 4.5) and lowest (2.6, 2.4, 2.7 and 2.6) benefit cost ratio was noted for L 4

L 4 C 3, and L 4 C 4 treatment and L 5 C 1 , L 5 C 2 L 5 C 3 and L 5 C 4 treatment. So, Red and Blue (70:30) light can be economically used.