BANGLADESH JOURNAL OF FOREST SCIENCE
A Half-yearly Peer Reviewed Journal of Bangladesh Forest Research Institute
A Half-yearly Peer Reviewed Journal of Bangladesh Forest Research Institute
Effect of pre-sowing treatments on seed germination of jigni (Trema orientalis) was conducted in different growing media to optimize cultural practices for raising seedlings at nursery level. The study was conducted during 2017-2020 at Headquarters Nursery, Silviculture Research Division, Bangladesh Forest Research Institute, Chattogram. The experiment for the nursery technique were laid out in a Completely Randomized Design (CRD). The seeds of Trema orientalis have been observed to exhibit physical dormancy due to presence of hard seed-coat. To overcome this problem, seeds were heated with six water soaking treatments except two (Coated seed without treatment, To and un-coated seeds without soaking treatment, T00) and were sown in germination media such as trays, polybags and seed beds. Six pre-sowing treatments were, Coated seeds immersed in normal water for 24 hours (Tj), 72 hours (T2) and 120 hours (T3) and un-coated seeds dipped in normal water for 24 hours (T01), 72 hours (TQ2) and 120 hours (T03) respectively. Jigni seeds showed the highest germination (75.94%) in TQ3 sown in seed bed and lowest Too (20.24%) which was significantly (P<0.05) different from other treatments. The result also showed that the highest mean height (88.5 cm) and collar diameter (3.77 nun) was recoided in T03. These findings revealed that, seeds soaked in normal water for 120 horns and then sown in seedbed were found suitable for quick germination and maximum seedlings production for jigni.
Germination percentage of Tamarindus indica L. seeds were observed with 4
pre-sowing treatments viz, i) soaked in cow urine for 24 hours, ii) soaked in
cow dung slurry for 24 hours, ii) soaked in tap water for 24 hours, iv) soaked in
hot water (100 0 C) for 30 seconds and followed by one hour in tap water and v)
control, in the nursery of Bangladesh Forest Research Institute, Chattogram.
Growth performances of seedlings were also determined in nursery and field
conditions. The germination test was conducted in nursery bed filled with soil
and decomposed cow dung at a ratio of 3:1. The growth performance of
seedlings were determined by transferring the young seedling after 30-45 days
of germination having 5-6 leaves from germination bed to polybags (15 cm ×
23 cm) filled with soil mixed with cow dung. Growth performance in the field
was observed by out planting one year old seedling at 1.5 m × 1.5 m, 2.0 m ×
2.0 m and 2.5 m × 2.5 m spacing. Germination percentage was significantly
(p<0.05) influenced by pre-sowing treatments and highest germination
percentage (86%) was obtained in cow urine treatment for 24 hours and lowest
(44%) was found in hot water treatment. Growth performance of seedlings was
also influenced by pre-sowing treatments in the nursery and highest vigor index
was observed in cow urine treatment (3988) and lowest in hot water treatment
(1629). Survival percentage of seedlings was highest 98% at 2.0 m × 2.0 m
spacing in the field and average height was more than 68 cm after 12 months of
out planting. Therefore, pre-sowing treatment of seed in cow-urine for 24 hours
suggested for nursery raising and one old year seedlings may be planted at 2.0
m × 2.0 m spacing in the field for successful plantation of the species.
Germination percentage of Tamarindus indica L. seeds were observed with 4
pre-sowing treatments viz, i) soaked in cow urine for 24 hours, ii) soaked in
cow dung slurry for 24 hours, ii) soaked in tap water for 24 hours, iv) soaked in
hot water (100 0 C) for 30 seconds and followed by one hour in tap water and v)
control, in the nursery of Bangladesh Forest Research Institute, Chattogram.
Growth performances of seedlings were also determined in nursery and field
conditions. The germination test was conducted in nursery bed filled with soil
and decomposed cow dung at a ratio of 3:1. The growth performance of
seedlings were determined by transferring the young seedling after 30-45 days
of germination having 5-6 leaves from germination bed to polybags (15 cm ×
23 cm) filled with soil mixed with cow dung. Growth performance in the field
was observed by out planting one year old seedling at 1.5 m × 1.5 m, 2.0 m ×
2.0 m and 2.5 m × 2.5 m spacing. Germination percentage was significantly
(p<0.05) influenced by pre-sowing treatments and highest germination
percentage (86%) was obtained in cow urine treatment for 24 hours and lowest
(44%) was found in hot water treatment. Growth performance of seedlings was
also influenced by pre-sowing treatments in the nursery and highest vigor index
was observed in cow urine treatment (3988) and lowest in hot water treatment
(1629). Survival percentage of seedlings was highest 98% at 2.0 m × 2.0 m
spacing in the field and average height was more than 68 cm after 12 months of
out planting. Therefore, pre-sowing treatment of seed in cow-urine for 24 hours
suggested for nursery raising and one old year seedlings may be planted at 2.0
m × 2.0 m spacing in the field for successful plantation of the species.
The colonization status of arbuscular mycorrhizal (AM) fungi of Melia azedarach L.
seedlings grown from seven different types of pre-sowing treated seeds and the spore
population in the rhizosphere soils were studied. The percent root colonization varied
significantly and ranged between 14.81-95.0 in different treatments. The superior
seedlings showed heavy root colonization as compared to otherseedlings. The intensity of
colonization and spore population also varied significantly in different treatments. Spore
population was not correlated with the percent root colonization and seedling growth
parameters. Four AM genera such Glomus, Acaidospora, Entrophospora and Gigaspora were
identified from the rhizosphere soils of the seedlings. The importance ofAM fungi has been
ensured from this study for the primary establishment of M. azedarach seedlings in the
nursery
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