Nursery Growing Media Practice: Impact on Seed Germination and Initial Seedling Development of Hymenodictyon orixensis (Roxb.) Mabberley - A Vulnerable Native Tree Species

다국어 초록 (Multilingual Abstract)

Hymenodictyon orixensis (Roxb.) Mabberley (locally known as Bhutum in Bangladesh) is both an ecologically and economically valuable multipurpose tree species for afforestation and reforestation programs in Bangladesh. Seed germination and seedling development study of H. orixense were conducted to find out the response to different growing medium, e.g., polybag (15×10 cm (T0) and 20×15 cm (T1)), sand medium in propagator house (T2), conventional nursery bed (T3), and root trainer (T4) in the Nursery. Consequently, germination behavior and seedling morphological parameters of H. orixense were assessed. The results revealed that the sand medium of the propagator house (T2) provided the highest germination % (58.57±22.30) and the highest germination energy (11.43±2.43) followed by seedlings growing in 20×15 cm polybags (T1) containing forest topsoil and cow-dung at a ratio of 3:1. Except for germination energy, germination values, and germination capacity, other seed biology parameters, particularly imbibition, germination period, germination rate, and plant survival percent in T1, T2, T3, and T4 were significantly (p＜0.05) different from T0. Each phenotypic parameter of seedlings and dry matter of shoot and root significantly differed from control except root length (p＜0.992). Based on this study, Polybags of 20×15 cm size are regarded as the best medium for quality seedling development of H. orixense. The nursery bed (T3) had the lowest germination performance and developed more inferior quality seedlings. Thereby, 20×15 cm size of polybags with conventional soil and cow-dung media is recommended for maximum germination and to grow the quality seedlings of H. orixense in the Nursery.

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