Abstract
The effects of planting density on the growth of Welsh onion in NFT (Nutrient Film Technique), were investigated to obtain basic knowledge to promote stable production and improve its quality.
Welsh onion was grown for 14 weeks on a panel (99 × 31 × 2 cm) with different numbers of planting holes (36, 68, 84 or 116 holes per panel). Three plants were planted per hole. The leaf sheath became significantly thinner at higher planting densities. The thinnest diameter of leaf sheath 5.9 mm was attained, when a panel with 116 holes was used. The shoot and root weight per plant tended to decrease at higher planting densities. However, the yield per one square meter tended to increase at higher planting densities and the yield amounted to 4.3 kg on panel with 116 holes.
It was considered from a suitable diameter of leaf sheath and yield that Welsh onion grown as a condiment is suitable for growing hydroponically on a panel with 116 holes (380 holes per square meter; 1134 plants per square meter).
