Jurnal Online Universitas Jambi
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Perbaikan Pertumbuhan Gmelina arborea Roxb dan Nauclea orientalis Linn dengan Pemangkasan Akar dan pemberian Biostimulan: Enhancement of Gmelina arborea Roxb and Nauclea orientalis Linn Growth with Root Pruning and Bio-Stimulants
No full textABSTRACT
A lack of seedling maintenance could lead to decreases in the quality of their growth. Stunted root systems could lead to future disruptions in nutrient absorption. In this research, the root system was improved by applying root pruning to improve the growth of new lateral roots. Furthermore, liquid fertilizer was added to further increase plant growth. This study aims to examine the influence of root pruning and bio-stimulants towards the growth of the saplings gmelina (Gmelina arborea Roxb) and canary wood (Nauclea orientalis Linn), both of which had stunted growth in their permanent nursery in Dramaga Bogor, Indonesia. Factorial design with two analysis factors was used in this study. These were root pruning (0% and 30%) and bio-stimulants (0% and 2%). The combination of 0% root pruning and 2% bio-stimulants increased G. arborea growth (diameter, total dry weight, and number of leaves) and N. orientalis growth (height, diameter, and total dry weight). The combination of 30% root pruning and 0% bio-stimulants showed a significant influence on the number of G. arborea leaves. The combination of 30% root pruning and 2% bio-stimulants affected the leaf colour change of G. arborea and increased both of the saplings root growth. In all treatments, G. arborea and N. orientalis saplings had a seedling quality index value in the range of 0.2 – 1.1.
Keywords: bio-stimulants, Gmelina arborea, nauclea orientalis, root pruning, seedlings
ABSTRAK
Kurangnya kegiatan pemeliharaan dalam persemaian dapat menyebabkan penurunan kualitas bibit bahkan dapat menyebabkan kematian bibit. Salah satu penyebab kematian bibit adalah akar tidak dapat berkembang dengan baik sehingga fungsinya sebagai alat absorpsi unsur hara akan terganggu. Pada penelitian ini, pemangkasan akar dilakukan untuk memperbaiki sistem perakaran dan meningkatkan pertumbuhan akar lateral baru. Oleh sebab itu, penambahan pupuk cair juga dilakukan untuk meningkatkan pertumbuhan tanaman. Penelitian ini bertujuan menguji pengaruh kombinasi pemangkasan akar dan pemberian biostimulan terhadap pertumbuhan bibit gmelina (Gmelina arborea Roxb) dan gempol (Nauclea orientalis Linn) yang keduanya mengalami stagnasi di persemaian permanen Dramaga Bogor. Penelitian dilakukan menggunakan rancangan acak lengkap faktorial, dengan 2 faktor yaitu pemangkasan akar dan pemberian biostimulan. Pemangkasan akar terdiri atas 2 taraf yaitu 0% dan 30%. Pemberian biostimulan terdiri dari 2 taraf yaitu 0% dan 2%. Pemberian biostimulan 2% dapat meningkatkan pertumbuhan G. arborea (diameter, berat kering total, dan jumlah daun) dan meningkatkan pertumbuhan N. orientalis (tinggi, diameter, dan berat kering total). Pemangkasan akar 30% menunjukkan pengaruh yang signifikan terhadap penambahan jumlah daun G. arborea. Sedangkan kombinasi pemangkasan akar dan pemberian biostimulan mempengaruhi perubahan warna daun pada G. arborea dan meningkatkan pertumbuhan akar pada kedua bibit. Pada semua perlakuan, bibit G. arborea dan N. orientalis memiliki nilai indeks kualitas bibit pada kisaran 0,2 – 1,1.
Kata kunci: bibit, biostimulan, Gmelina arborea, nauclea orientalis, pemangkasan aka
Pengaruh Proses Bleaching Terhadap Finishing Kayu Pinus Dan Kayu Karet Terserang Blue Stain: The Effect of Bleaching Process on Finishing of Pine Wood and Rubber Wood Attacked by Blue Stain
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One of the problems faced by the furniture industry is the attack of coloring fungi or what is commonly called blue stain. The attack of coloring fungi causes color changes so that the appearance of the wood decreases. The bleaching process is one way that can be done to overcome the attack of blue stain. The bleaching process in the industry uses the chemical white agent 250 (WA-250). However, research related to the effect of the bleaching process on the finishing of pine wood and rubber wood attacked by blue stain has not been carried out. This study aims to determine the effect of the bleaching process on the finishing of pine wood and rubber wood attacked by blue stain. Finishing tests include testing the adhesion of the finishing layer (cross cut test) referring to ASTM D 3359, flexibility testing is carried out with a coin test, and hardness testing refers to ASTM D 3363. The results of this study are that the bleaching process does not affect the finishing process on pine wood and rubber wood attacked by blue stain, both those treated with bleaching and those without bleaching treatment, which are included in the same finishing quality category. Based on the adhesion test, it is included in class 4B (Good) and its flexibility gets a value of 5 (very good), while the hardness of the finishing layer is in the less category.
Keywords: bleaching, blue stain, finishing, pine wood, rubber wood
ABSTRAK
Permasalahan yang dihadapi oleh industri furnitur salah satunya adalah serangan jamur pewarna atau yang biasa disebut blue stain. Serangan jamur pewarna tersebut menyebabkan perubahan warna sehingga terjadi penurunan penampilan kayu. Proses bleaching merupakan salah satu cara yang dapat dilakukan untuk mengatasi adanya serangan blue stain. Proses bleaching pada industri menggunakan bahan kimia white agent 250 (WA-250). Namun, penelitian terkait pengaruh proses bleaching pada finishing kayu pinus dan kayu karet terserang blue stain belum dilakukan. Penelitian ini bertujuan mengetahui pengaruh proses bleaching terhadap finishing pada kayu pinus dan kayu karet yang terserang blue stain. Pengujian finishing meliputi pengujian daya lekat lapisan finishing (cross cut test) mengacu pada ASTM D 3359, pengujian fleksilbilitas dilakukan dengan coin test, dan pengujian kekerasan mengacu pada ASTM D 3363. Hasil penelitian ini adalah proses bleaching tidak mempengaruhi proses finishing pada kayu pinus dan kayu karet yang terserang blue stain baik yang diberi perlakuan bleaching maupun tanpa perlakuan bleaching masuk dalam kategori kualitas finishing yang sama. Berdasarkan uji daya lekat termasuk pada kelas 4B (baik) dan fleksibilitasnya memperoleh nilai 5 (sangat bagus), sedangkan kekerasan lapisan finishingnya kategori kurang.
Kata kunci: bleaching, blue stain, finishing, kayu karet, kayu pinu
Struktur Komunitas Estimasi Simpanan Karbon Tegakan Mangrove Di Pesisir Sungai Sambas Besar, Kecamatan Tekarang, Kabupaten Sambas: Community Structure and Estimation of Mangrove Stand Carbon Stock on the Coast of the Sambas Besar River, Tekarang Subdistrict, Sambas Regency
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Mangrove ecosystems play an important role in coastal protection, habitat provision, and carbon storage (blue carbon). This study aimed to analyze mangrove community structure and to estimate carbon stocks and CO₂ sequestration along the Sambas Besar River, Tekarang Subdistrict, Sambas Regency. The research was conducted in September 2025 using an exploratory approach with purposive sampling near a bridge construction area. Vegetation data were collected using line transects and quadrats of 10×10 m, 5×5 m, and 2×2 m according to growth stages. Community structure was assessed using density, frequency, dominance, and the Importance Value Index (IVI). Biomass was estimated using allometric equations for Sonneratia caseolaris, Nypa fruticans, and a general mangrove model. Carbon stocks were calculated using a carbon fraction of 0.47, and CO₂ sequestration was estimated based on molecular ratios. Three mangrove species were identified (S. caseolaris, N. fruticans, and Acanthus ilicifolius), with S. caseolaris as the dominant species (mean IVI 226.026 at the tree level and 300 at the sapling level). The average stand biomass was 35.355 t/ha, mean carbon stock was 14.266 t/ha, and estimated CO₂ sequestration reached 111.302 t/ha. Measured water parameters (pH ≈ 6.9; DO ≈ 5.4 mg/L; temperature ≈ 30 °C; salinity ≈ 12 ppt) supported mangrove ecosystem functions. These results confirm the contribution of mangrove stands to carbon storage and emission mitigation and emphasize the need for conservation management, periodic monitoring, and targeted rehabilitation.
Keywords: biomass, community structure, Sambas River, stand carbon.
ABSTRAK
Ekosistem mangrove berperan penting dalam proteksi pesisir, habitat, dan penyimpanan karbon (blue carbon). Pemahaman mengenai struktur komunitas dan estimasi simpanan karbon tegakan diperlukan untuk perencanaan konservasi dan mitigasi iklim. Penelitian ini bertujuan mengetahui struktur komunitas dan mengestimasi simpanan karbon serta serapan CO₂ pada tegakan mangrove di pesisir Sungai Sambas Besar, Kecamatan Tekarang, Kabupaten Sambas. Penelitian dilaksanakan pada Bulan September 2025 dengan pendekatan eksplorasi dan pemilihan stasiun purposive di sekitar pembangunan jembatan. Data vegetasi dikumpulkan melalui transek garis dan kuadran 10×10 m, 5×5 m, dan 2×2 m sesuai kategori pertumbuhan. Analisis meliputi kerapatan, frekuensi, dominansi, dan Indeks Nilai Penting (INP). Biomassa tegakan diperkirakan menggunakan persamaan allometrik spesifik untuk S. caseolaris, N. fruticans, dan model umum mangrove. Simpanan karbon dihitung dengan faktor fraksi karbon 0,47; serapan CO₂ dihitung berdasarkan rasio molekuler CO₂ terhadap C. Tiga spesies teridentifikasi yaitu S. caseolaris, N. fruticans, dan A. ilicifolius. S. caseolaris sebagai spesies yang dominan (INP rata-rata 226,026 pada tingkat pohon; 300 pada tingkat pancang). Rata-rata biomassa tegakan 35,355 ton/ha, simpanan karbon 14,266 ton/ha, dan estimasi serapan CO₂ 111,302 ton/ha. Parameter perairan yang telah diukur (pH ≈ 6,9; DO ≈ 5,4 mg/L; suhu ≈ 30 °C; salinitas ≈ 12 ppt) memenuhi standar yang relevan serta mendukung fungsi ekosistem mangrove. Hasil menegaskan kontribusi tegakan mangrove terhadap stok karbon dan mitigasi emisi serta menuntut pengelolaan konservasi, monitoring berkala, dan rehabilitasi terarah.
Kata kunci: biomassa, karbon tegakan, struktur komunitas, Sungai Sambas
Compliment Response Strategies of English Pre-Service Teachers
Get PDFLearning English goes beyond merely memorizing English words and grammar rules. Instead, understanding the socio-cultural background is essential as an important part of successful communication. As a part of politeness strategies, responding appropriately to an English compliment is an urgent skill to master especially by English teachers as they play an important rule for their students in the process of English learning. This article therefore is aimed at investigating how English pre-service teachers at Jambi University respond English compliments. The design of this study is descriptive qualitative. The data collection tool is an interview which then be analyzed using Thematic Analysis. Based on the data, three major findings have emerged, they are: the variations of students’ responses toward English compliments, the influences of Indonesian language system in students’ responses and students’ lack of ability in producing appropriate compliment responses
Upholding the existence of gamad dance art and educational programs: Cultural signifiances, challenges, and presevation efforts
Get PDFThis research aimed to describe and analyze the existence of Gamad dance art in Kota Mukomuko district, Mukomuko Regency, Bengkulu Province. It used qualitative research with data collection techniques consisting of interviews, observation, and documentation. The research object was the Gamad dance art in Mukomuko. The research site was at the Gamad art studio in Ujung Padang Village, Kota Mukomuko. The research showed that the Gamad dance performance had even fewer dancers. Some dances contained in the Gamad dance art were Sempaya, Bercerai Kasih, Pinang Island or Payung dance, Cis Marilom, Sakora, and others. The dance movements use Malay movements that are dominant in footwork, steps, hand swings, and silat movements. The costumes and make-up used by female dancers are baju kurung or long kebaya, songket skirts, headscarves, and beautiful make-up. The male costume uses a Malay suit with a side of songket cloth and a peci. Dance properties include scarves, handkerchiefs, umbrellas, and others. Per the host’s request, the performance time is day or night. 2) Gamad dance art still exists in the community. 3) The community preserves the Mukomuko Gamad dance art, inviting its dance group to various events
Effectiveness of principals’ supervision and the learning performance of high school teachers through digital-based PLC
Get PDFTeachers' learning performance can be improved through the principal's supervision by implementing several strategies and supporting tools. One of the strategies in learning supervision can be carried out through digital-based Professional Learning Communication (PLC) activities. The purpose of this study is to analyze the effectiveness of learning supervision in improving teacher learning performance through digital-based PLC activities, using a quantitative method with a multiple-regression research design. The results showed that the adjusted R2 (determination coefficient) was 0.934, meaning that the supervision activity of digital-based PLC (X1), and the supervision outcome activity of digital-based PLC (X2) contributed 93.4%, to the improving the learning performance of high school teachers (Y), while the remaining 6.6% explained by other factors that are not described in this study. The result of F (418.635) > F-table (3.91) and the significance value of P = 0.001 < α 0.05, means that the test model is feasible. In other words, there is a significant simultaneous influence of both variables on the improvement of high school teachers' learning performance (Y)
The analysis of teacher’s perception of the integration of Kasepuhan local wisdom into school curriculum
Get PDFThe purpose of this study is to analyze teachers' perceptions of the integration of the Kasepuhan local wisdom into school curricula. Using a survey method, data were collected through questionnaires distributed to schoolteachers to evaluate their knowledge of the Kasepuhan cultural values, the extent of integrating these values into teaching practices, and the challenges encountered in implementing local wisdom-based education. The study also examined curriculum development, assessments, teacher competence, teaching materials, learning media, and community involvement. The results revealed that while 35% of teachers know Kasepuhan values, only 13.33% believe these values are applied in schools. A significant number (40%) indicated the need for curriculum adjustments to reflect local culture better, while 70% reported that local wisdom-based assessment criteria had not been optimally implemented. Furthermore, the study concludes that although teachers recognize the importance of integrating Kasepuhan wisdom, challenges such as insufficient resources, lack of training, and limited school facilities hinder its implementation
Technology readiness for augmented reality integration in instructional design: Students’ perception
Get PDFThis research aims to explore perception of students’ technology readiness in integrating instructional design based Augmented Reality (AR). This research was qualitative research. The technique of collecting data used interview technique. The sample of this research was 17 students who have used augmented reality in learning in English Education Study Program of Universitas Muhammadiyah Muara Bungo. The technique of data analysis used thematic analysis. Researchers used MAXQDA 24 software to analyze qualitative data. The findings showed that four positive and two negative perceptions of integrating AR. Positive perceptions include optimism, innovation, perceived usefulness, and ease of use. Students believe AR enhances English instruction and transforms teaching in a digital era. It also helps develop technical skills through user-friendly tools and pre-built assets, enabling content creation without advanced programming. Negative perceptions include discomfort and insecurity in AR use. Discomfort arises from technical issues like scanning difficulties, device overheating, image freezes, internet dependency, hardware limitations, high data consumption, and app instability. Insecurity stems from limited technical skills and challenges in conceptualizing AR designs.
Speech act modes in the thesis examination process: The Case of a private university
Get PDFThis research examined speech act modes in the thesis examinations of students in Indonesian Language and Literature Education at the Faculty of Teacher Training and Education, Universitas Merangin. This research used a qualitative descriptive research design. The data obtained in this research consisted of words, phrases, clauses, and sentences during the thesis examination. Data analysis was conducted using a content analysis method that focused on the quality of meaning in the context of direct and indirect speech acts. The direct and indirect speech act modes in the examination process conducted by the examiners and students were found to be as follows:1) Declarative mode, including for managing speaking turns, opening the exam, informing, ordering, and so on; 2) Interrogative mode, aimed at asking, ordering, refuting, investigating, clarifying, and so on; 3) Imperative mode, used for ordering, prohibiting, arguing, expressing gratitude, apologizing, and so on. In-depth research in pragmatic studies is necessary to inform the development of thesis course learning plans and the implementation of thesis examinations
Analysis of teachers’ pedagogical competence in improving the quality of learning
Get PDFThis research aimed to assess the educational abilities of teachers in terms of planning learning activities, implementing the teaching process, and making efforts to increase student motivation in learning. The research employed a qualitative approach to gather data through interviews, observations, and document collection. The data analysis process encompassed information reduction, data presentation, and conclusion. The subjects who became informants were the principal, his deputy, and educators. The results indicate that educators’ pedagogical expertise in compiling learning activities is evident in their preparation of the lesson plan. However, several teachers often do not bring it, so the learning objectives are not achieved optimally. When learning, teachers demonstrate an understanding of the material by studying the textbook’s contents. However, problems still exist in class management, and there is a lack of discipline regarding time usage. To increase students' enthusiasm for learning, teachers create opportunities for active participation by utilizing information and communication technology, establishing effective communication with them, and conducting reflection to enhance the quality of learning