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Dede J. Sudrajat

Forest Tree Seed Technology Research Institute

Author-ID : 2436352

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences

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Comparison of Nyamplung Plant Establishment: Direct Seeding, Bare-root, Blocked Media, and Containerized Seedlings Dede J. Sudrajat; Nurhasybi Nurhasybi; Eliya Suita
Jurnal Manajemen Hutan Tropika Vol. 24 No. 2 (2018)
Publisher : Institut Pertanian Bogor (IPB University)

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Nyamplung (Calophyllum inophyllum L.), a native multipurpose tree species, produces good general-purpose timber, biodiesel, and medicine. The most widely used method of establishing the species is transplanting nursery-grown containerized seedlings. The research was aimed to compare the success of plant establishment methods, including direct seeding, direct seeding using seed pellet, bare-root seedling, containerized, and blocked media seedlings. Randomized block design with three blocks was set up for evaluation of field performances including seedling survival, height, collar diameter, root development, and biomass at nine months old. The estimated cost based on 1000 target plants in each method was calculated. Seedling grown up on blocked media and containerized media had the highest field performances (survival, growth, and biomass) followed by bare-root seedlings. Direct seeding using seed pellet tended to have better root formation, especially in tap root length, tap root biomass, and bellow-ground biomass. Based on the cost estimation, direct seeding was twice lower compared to transplanting of containerized and blocked media seedlings. However, planting of blocked media and containerized seedlings was more effective in rapidly growth and establishing canopy, but need higher cost. Whereas direct seeding using seed pellet was more cost efficient. Direct seeding using seed pellet was a promising alternative method for plant establishment of nyamplung.

EFFECT OF GAMMA IRRADIATION ON SEED GERMINATION, STORAGE, AND SEEDLING GROWTH OF Magnolia champaca L. Muhammad Zanzibar; Dede J. Sudrajat
Indonesian Journal of Forestry Research Vol 3, No 2 (2016): Indonesian Journal of Forestry Research
Publisher : Secretariat of Agency for Standardization of Environment and Forestry Instruments

Gamma irradiation of seeds is known as an important factor in stimulating biochemical and physiological processes. This paper investigates the effect of seed irradiation on the seed germination, storability, and seedling growth traits of Magnolia champaca. Seeds were irradiated with 0, 5, 10, 15, 20, 40, 60, 80 and 100 Gy by Cobalt-60. The treated seeds were grouped into three lots, namely germination test, storage test and seedling growth characteristics. Observations were made for seed germination percentage, germination index, mean germination time, germination value and growth traits such as height, collar diameter, number of leaves, root length, and dry weight. Results showed that irradiation at a dose of 30 Gy was close to LD50, and irradiation at doses of 80 Gy and higher caused lethal effect. The maximum increase of germination parameters on irradiated seed was recorded at a dose of 10 Gy, and then it decreased. Growth rate in terms of seedling height, collar diameter, number of leaves, and dry weight have also increased in gamma irradiation doses up to 80 Gy, but the dose of 10 Gy resulted in survival and growth that was more stable and gave the highest values for most of the parameters. Hence, lower dose (10 Gy) of irradiation treatment can be used to increase seed germination, storability and seedling growth of M. champaca.

Seeds Characteristics of Gelam (Meulaleca leucadendra): Seed Maturity, Morphology, Germination and Storability Dede J. Sudrajat
Jurnal Perbenihan Tanaman Hutan Vol 4, No 2 (2016): Jurnal Perbenihan Tanaman Hutan
Publisher : Forest Tree Seed Technology Research & Development Center (FTSTRDC)/ Balai Penelitian dan

Gelam (Meulaleuca leucadendra (L.) L.) is a potential species for construction timbers adapted to degraded swamp forest. Cultivation of this species is still limited and needs supporting of information of seed procurement technology, such as seed maturity, germination technique and storability. The present paper deals with assessing of seed maturity, morphology, germination and storability of the species. The seeds were collected from three natural populations, i.e. Landasan Ulin, Gasing, and Jabiren, and tested in a laboratory. The results showed that seed maturity can be identified from source of fruit/stalk. Seeds from the second and third fruit stalks resulted the best germination capacity,i.e 984 seedlings-0.1 g and 809 seedlings -0.1 g , repectively. Fruit morphology, seed germination, and storability were significantly different among populations. Fruit from Gasing with length of 3.81 mm, diameter of 3.79 mm and weight of 0.037 g had higher sizes than fruits from Landasan Ulin and Jabiren. The best seed germination of the three seedlots was resulted from top paper method with 12 hours lighting period. In the nursery practices, the mixed media of sand and rice husk charcoal (1:1 v/v) gave the best result of germination. The best storage of seeds was refrigerator room wraped by impermeable plastic bag. Seeds from Jabiren provided the best germination and storability that gave a germination capacity of 925seedlings-0.1g and 731 seedlings-0.1 g before and after storage for one year, respectively.

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