Shorea platyclados is one of fast growing Dipterocarp species for enrichment planting in Logged Over Area (LOA) of tropical rain forests. One of the constrain to supply the seedling for support enrichment planting is the irregular flowering of S. platyclados. Moreover, the vegetative propagation is an alternative method to provide the sustainable seedling for enrichment planting in the LOA. This experiment was carried out to assess the effects of IBA concentrations on rooting ability, the primary and secondary root length, and the accumulated number of primary and secondary roots on shoot cutting of S. platyclados. The research was conducted in Completly Randomized Design (CRD) with 5 replications. The treatment was five concentrations of IBA, i.e. 0 ppm, 25 ppm, 50 ppm, 75 ppm, and 100 ppm. The data were analyzed using one-way analysis of variance (one way ANOVA) to determine the effect of IBA concentration variation among the treatments. The Duncan Multiple Range Test (DMRT) was used for multiple comparisons among the means of treatment at tα=5%, Results showed IBA concentrations significantly affected the rotting ability, the primary and secondary root length of shoot cutting (P < 0.05). On the other hand, the number of primary and secondary roots was not significantly different among treatment (P > 0.05). For rooting ability, 100 ppm of IBA concentration was the highest of all treatments. Meanwhile, 75 ppm of IBA concentration was the best treatment for development of root, i.e. the number of primary roots, the length primary and secondary roots.
This study aimed to determine the flowering and fruiting phenology of jackfruit originated from Sumatra landraces planted in ex situ conservation in Yogyakarta within the 2018 and 2019 flowering periods. Flowering ontogeny and phenology were observed following Owens and Pushpakumara methods. Results found five developmental stages of male inflorescences, which last in 64-101 days, ended by the drought and abscissed of the males. Female inflorescences undergo five stages which take 92-160 days in total. Differences in rainfall and the dry season period resulted in different onset and duration of flowering. In 2018, which has more rainfall and a shorter dry season, flowering initiates lately (February-June) with a longer duration (6 months). In 2019, the less rainfall and more extended dry season resulted in early flowering (January-April) with a shorter duration (4 months). The Medan landrace flowered later and longer. Flowering synchrony occurred between sexes within the same tree, but there was asynchronous flowering among individual trees. Water availability is crucial in flowering and fruit production. Flowering stimulation and pollination management may also be conducted to increase flower production, pollinating agents, and fruit production and synchronize the flowering.
Bulakbaru village in JeparaDistrict is a village located in the northeastern coast of Java Sea. This village is prone to abrasion. Each year its land was reduced by between 50 to 100 meters. The existing vegetation in the area is only some mangroves, so that the condition of this coastal area has become more extreme. This condition requires efforts to improve and manage the coastal area potential with a variety of methods. Coastal rehabilitation requires strong human resources, equipped with appropriate science and technology for the coastal community. The research aims to encourage karang tarunato manage coastal potential and transfer simple technology for the rehabilitation of the coastal area so that the community can participate actively in preserving a sustainable environment. This programcomprises methods of public education, consultation, diffusion of science and technology, training and mediation. In the implementation of the program it was evident that the community, particularly members of karangtaruna, actively participated in all activities so that they could learn the science and technology and became more open-minded in managing the potential of their coastal village. Large portion of the the coastal rehabilitation technology can be transfered to the community. The village community was able to realize the importance of mutual cooperation to manage their environment in order that it can be sustainable.
Bambu petung banyak digunakan untuk bahan konstruksi bangunan karena sifatnya yang keras dan kuat. Pembiakan secara vegetatif menggunakan rimpang (rhizome), namun memiliki kelemahan, yaitu kesulitan dalam pembongkaran rumpun bambu. Oleh karena itu digunakan stek cabang,lebih praktis, bahan stekter sedia lebih banyak, mudah diperoleh, murah, tidak merusak rumpun asal, waktu pengambilan lebih cepat, dan pembentukan rumpun lebih mudah. Media pengakaran yang umum digunakan adalah top soil, namun pengadaan top soil dalam jumlah besar sulit, sehingga perlu dicari alternatif lain yaitu dengan mencampur media top soil dengan media lain. Media yang digunakan yaitu media tanah, arang sekam dan kombinasi tanah+arang sekam (2:1). Stek cabang bambu petung dengan umur pohon induk ± 2 tahun, diameter 2-3 cm dan panjang 2 ruas. Panjang tunas pada perlakuan media tanah, arang sekam dan kombinasi tanah+arang sekam menunjukkan berbeda di antara perlakuan. Jumlah tunas terbanyak terdapat pada perlakuan media arang sekam dan kombinasi tanah+arang sekam (3 tunas). Media campuran tanah+arang sekam menunjukkan panjang tunas terpanjang (37,11 cm), dan panjang akar terpanjang (17,5 cm). Media tanah dan arang sekam menunjukkan % berakar terbesar (86,67 %).Kata kunci: stek cabang, bambu petung, media tanah, arang sekam, pembiakan vegetatif. Growth of branches of petung bamboo (Dendrocalamus asper) grafting in soil media, husk charcoal, and their combinationAbstractRecently, the utilization of bamboo is more extensive, but the attention towards its regeneration is not sufficient. The use of stem or branch cuttings are more practical and having more benefits and promising because the cutting materials are more available, easier to gain, cheaper, undamaging the source clump, faster in the taking time, and easier in the clump formation. The common rooting media used is top soil (the fertile part of upper layer soil). Recently, it is quite hard to provide top soil in a large number. Thus, it is important to find an alternative source in order to decrease the use of top soil that is by mixing the top soil media with other materials. The media used were soil media, husk charcoal, and the mixture of soil and husk charcoal (2:1). The branch cuttings used were branches of petung bamboo taken from 2 years old amboo, with 2-3 cm in diameter, and 2 nodus in length. The treatment was done by giving some variations in the soil media, the husk charcoal,and the mixture of soil and huskcharcoal. The mixture of soil and huskcharcoal media gave a significant influencet o the length of sprout variable,but it did not give significant influence to the number of sprout, the length of root, and the percentage of rooting.
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