Abstract
We investigated the effects of leaf- and root-pruning treatment of cell seedlings at planting time on plant growth, nitrogen uptake, harvest time, and yield in Japanese bunching onion (Allium fistulosum L.). Leaf-pruning treatment had a negative effect on the number of living leaves and leaf sheath diameter, which were inhibited until harvest on August 20; however, although the number of roots and root growth were temporarily inhibited, the growth was equal to that of the control on July 19. Root-pruning treatment negatively affected the number of emergent leaves, plant height, number of living leaves, shoot weight, leaf sheath diameter, number of roots, and growth of roots until harvest on August 20. The total amount of nitrogen uptake was lower in the root-pruning treatment than that in the leaf-pruning treatment. Plants of all treatments reached the market standards for height on July 19, although the target yield of 300 kg・a−1 was reached from the control on July 19, then from the leaf-pruning treatment on August 5, and from the root-and leaf-pruning treatments on August 20.
