The diazotroph bacteria as ecofriendly biofertilizers play an important role in improving the N status and availability of paddy soil. Laboratory experiment to study nitrogenase activity and IAA production of diazotroph from rice rhizosphere and to assess its effect on the growth of rice seedling has been conducted from September to October 2014 in Agronomy and Horticulture Laboratory Faculty of Agriculture Jenderal Soedirman University, Purwokerto. The experiment was arranged as a completely randomized design and consisted of seven treatments and provided with 4 replications. The treatments were the isolates of indegenous diazotroph (T1 = A11003, T2 = A230041, T3 = A24001, T4 = A230022, T5 = A230021, T6 = A230042 and T7 = without inoculation). The nitrogenase activity measured by acetylene reduction assay method and IAA production was measured by HPLC method. Plant height, leaf greeness, leaf area, total dry weight and total root length were determined on 21 days after sowing. The experimental results showed that the isolat A230021 was identified as Rhizobium sp. LM-5 and have the highest nitrogenase activity at 0.07 µM C2H4 ml -1 h -1 and IAA production reached 19.01 ppm. Inoculation with strains of diazotroph enhanced chlorophyl content, total root length, and biomass production.
Tengger tribe is one of the tribes in Indonesia that live around Bromo Tengger Semeru National Park (BTSNP) area. BTSNP area inhabited by the Tengger tribe people is an area in Indonesia with high biodiversity. The local wisdom of the Tengger tribe is in terms of the use of natural resources for various requirements of their lives. This study aimed to explore the utilization of multiple plants by the Tengger tribe in Ngadas and Ranupani villages around BTSNP. This research used surveys and group discussion (GDF) methods involving traditional leaders and some people of the Tengger tribe. The data obtained were analyzed descriptively and qualitatively. The results showed that the plants used for traditional medicinal materials were 25 species, food sources were 17 species, industrial materials and household were 11 species, building materials were 17 species, ecological functions were nine species, and traditional ritual ceremonies were seven species. The Tengger tribe used the natural resources in the form cultivation plants and non-cultivation plants to support in all aspects of their livelihood.
Restoration through re-vegetation activities is one of the solutions to recover degraded peatlands quickly. Shorea balangeran is one of the most promising species of Dipterocarpaceae that can be chosen for the degraded peatlands rehabilitation. The bagworm is one of the potential pests to damage the S. balangeran in Ogan Komering Ilir (OKI) regency. The objective of the study was to provide various information about bagworm insect pests on S. balangeran. Two measuring plots of 50 x 32 m laid on 2017 planted S. balangeran in agrosilvofishery based on integrated peat restoration pilot project. The variables observed were the number of attacked plants to calculate incidence and the number of attacked leaves in each observation unit (tree) using a scoring system to calculate the intensity. The data obtained were analyzed by descriptive quantitatively. The results showed that there were two species of bagworm in S. balangeran. The incidence of both bagworms was quite high, but the intensity of damage was still relatively mild. However, control measures for bagworms still need to be carried out.
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