2017 ASHS Annual Conference

Generally, the rice nursery facility in Korea is used only from April to June when the rice is nursery. Except these days, it does not use installed multi-layer system and nursery beds. Baby leaf vegetables are cultivated within 30 days from sowing to harvesting time and also contain a lot of functional ingredients. Therefore, the objective of this study was conducted to produce baby leaf vegetables using rice nursery beds for year-round utilization in rice nursery facility. This experiment was conducted to investigate the effect on growth and leaf color of baby leaf lettuce ‘red salad bowl’ grown in multi-layer system. The experimental material was 'Red Salad Ball' lettuce which leaf color is red (KOREGON co. Ltd, Korea), and was cultivated in Chuncheon, Gangwon-do, Republic of Korea on August 28, 2015. plants were raised seediling for 12 days, and then grown for 14 days in a multi-layer system. Rice nursery beds was filled with horticultural soil(Baroker, Seoul bio co. Ltd, Korea) and line sowing(3 x 3 cm, 150 lips / tray). The multi-layer system was built up to 6 layers, 1st floor height was 20cm over ground and rest floors are 30cm apart. Baby leaf lettuce were cultured by six- treatement, 20cm(S1), 80cm(S3), 170cm(S6), from the 1st layer to the 6th layer (S1S6), from the 3rd layer to the 6th layer (S3S6), and from the 6th layer to the 1st layer (S6S1).Treatment of S1S6, S3S6 and S6S1 wee transferred after 5days of layer treatment. During grow periods, each of multi-layer’s average temperature is 20 ~ 21 ℃ and the average light intensity is 753.8μmol·m⁻²·s⁻¹ for S6, 85.1μmol·m⁻²·s⁻¹ for S3 and 71.4μmol·m⁻²·s⁻¹ for S1. Plant length and leaf length at S3 were the longest 14.2cm and 13.6cm, respectively, and the fresh weight was high at S6 and low at S1. The Hunter a value was the lowest at S1, but S6 was high. The contents of polyphenols and flavonoids were no sifnificant different according to the layer, but anthocyanin was higher cultivated in S6 layer. The result of this study showed that baby leaf lettuce ‘red salad bowl’ grown in multi-layer system is advantageous for the product quality improvement to grow in S3 and S6 treatment which the light intensity was upper than 85μmol·m⁻²·s⁻¹. However, when it is inevitably cultivated in the lower layer, moving at a high layer 9 days before the harvest will help to improve quality.