Effect of nitrogen levels on growth and development of three Lisianthus (Eustoma grandiflorum (Raf.) Shinn) cultivars pot-planted in Ho Chi Minh City

Lisianthus (Eustoma grandiflorum (Raf.) Shinn) is favored in decoration because of its long-Lasting and colorful flowers. The objective of the experiment was to evaluate the effects of different levels of nitrogen on the growth and development of three Lisianthus cultivars pot-planted in Ho Chi Minh City. The experiment was laid out in split - plot design (SPD) with four levels of nitrogen (3; 4; 5; 6 g/pot) being the main factor and three lisianthus cultivars (Pink; Yellow; White/Purple) being the subordinate factor. Each pot was planted with one plantlet. The results indicated that plants applied with 4.0 g nitrogen per pot gave the best performance in plant height (18.41 cm) and number of leaves (24.08 leaves/plant) at 60 days after planted (DAP). The Pink cultivar reached the highest plant height (19.92 cm), number of leaves (43.53 leaves/plant) as well as number of flowers buds (12.31 buds/plant). The Pink cultivar, when applied with 4.0 g nitrogen/pot, gave the highest plant height (21.38 cm) at 60 DAP