Effect of planting density on growth and quality in hydroponics of Sedum sarmentosum.

摘要

The effect of planting densities on the growth of Sedum samentosum (4 collections) was investigated using nutrient film technique (NFT) with Yamazaki' lettuce nutrient solution (1982) from September 5th to October 24th in non-heating plastic film house. At 40 days, the plant height of 4 collections showed the range of 15.0-18.9 cm, and mean plant height was high the order of 10x10, 2.5x2.5, and 5x5 cm. The growth of 'Pohang' and 'Wando' collections was better compared to that of 'Gunsan' and 'Wanju' collections. Number of node, stem diameter, and fresh and dry weight per plant were decreased in higher planting density. Despite the lower fresh weight per plant obtained, the fresh yield per m2 was significantly increased in higher planting density. The mean fresh yield was 14.9 kg.m-2 in 2.5x2.5 cm, and 'Pohang' collection showed the highest fresh yield (17.6 kg.m-2). The first optimized harvesting time base on plant height was 30-40 days after NFT culture during autumn season. In eating quality, compression force of stem and bitterness of shoot were decreased in higher planting density. However, the heavy labor demanding high density cutting needs to be improved for hydroponic culture of S. sarmentosum.