1. Emyra Deska Rizki Utami
2. Reni Indrayanti
3. Adisyahputra
4. Ekaputri Azrai

Pak choi is a group of plants in the mustard family. The production factors affecting pak choi cultivation are seeds, nutrients, and pesticides. This study aimed to (1) test the seed viability and vigor of two pak choi cultivars and (2) determine the effect of different cultivars on the growth and yield of pak choi plants. The plant cultivars used in this study are ‘Brisk Green’ and ‘Nauli’. Viability and vigor testing of two pak choi cultivars showed no significant differences between pak choi cultivar ‘Brisk Green’ and cultivar ‘Nauli’ in the viability of seeds, with the percentage of Maximum Growth Potential (MGP) being 95.5 and 97.0%. Germination Potential (GP) was 86.5 and 84.0%. The vigor of seeds showed that the Seed Vigor Index (SVI) was 84.5 and 81.5%, and the Speed of Gemination (SG) was 12.4 and 12.0% at 5-7 days after sowing. Evaluation of plant growth showed that Pak choi cv. ‘Nauli’ has the highest number of leaves and fresh weights than ‘Brisk Green’, and it showed more resistance to watery soft rot due to the fungus of Sclerotinia sclerotiorum. This experiment also showed that growing plants in the indoor hydroponic planting system could be prospective for developing pak choi plants.