Teak Research Articles

Quality Test of Soil Transmitted Helminth Eggs using Natural Dye Extracted from Teak Leaves (Tectona grandis) at Concentrations of 40%, 60%, 80%, and 100% as an Alternative Dye in the Sedimentation Method

Quality Test of Soil Transmitted Helminth Eggs using Natural Dye Extracted from Teak Leaves (Tectona grandis) at Concentrations of 40%, 60%, 80%, and 100% as an Alternative Dye in the Sedimentation Method

Preparation of Tectona grandis Leaves derived Activated Carbon for High-Performance Supercapacitor Application

In energy-based applications, biomass porous micro/nanostructures activated carbon materials are the significant candidates, because of their high specific surface area, superior electrical conductivity, affordability and environmental friendliness. In this work, the activated carbon was prepared from Tectona grandis leaves as a biomass, and thus activated by 25% K2CO3 solution. The prepared carbon was designated as TGLAC. Second carbon was prepared from TGLAC was doped with urea and named as N-doped TGLAC. The physico-chemical analytical methods were employed to access the phase structure, bonding nature and morphological properties of the freshly prepared activated carbon material. Three electrode systems were utilized to estimate the supercapacitor features in 1 M Na2SO4 electrolyte. The prepared activated carbon electrode provides a specific capacitance of 371 F g–1 at 1 A g–1 and a 62% rate capability at 5 A g–1. It retains 94% of its initial capacitance during the cyclic stability analysis at 5 A g–1 over 5,000 cycles. This study demonstrates that carbon based materials obtained from sustainable waste biomass can exhibit favourable electrochemical performance in energy applications, providing a clear and feasible synthetic approach and strategy for their utilization.

Design, modeling and cost analysis of 8.79 MW solar photovoltaic power plant at National University of Sciences and Technology (NUST), Islamabad, Pakistan

Climate change, as a critical global concern, has fueled our efforts to address it through different strategies. In response to the critical worldwide issue of climate change, we suggested a Photovoltaic (PV) system at the National University of Sciences and Technology (NUST) in Islamabad, Pakistan (latitude: 33.724530 N, longitude: 73.046869, terrain elevation: 552 m). Islamabad is located in a region blessed with enormous solar resources, boasting a daily horizontal solar irradiance of 1503.45 kWh/m2 and an average daily solar irradiance of 5.89 kWh/m2, with an exceptional solar fraction of 98.99%. The ambient air temperature, averaging 23.21 °C, reaches its maximum in June and its minimum in December. Our research thoroughly evaluates the system’s performance, accounting for various losses and utilizing modern PVsyst software. Over the course of 18 years, our PV system is expected to save 75,478.60 tons of CO2, the equivalent of planting 348,754 teak trees. Furthermore, the cost of energy generation is an affordable 0.0141 US $/kWh, much lower than traditional rates, including the Sherif cost of 0.028$/kWh. Along with the performance research, we conducted a detailed cost analysis, projecting the starting cost and cash flow, and discovered that the plant would be in surplus within 12 years of installation. Our system is positioned to generate 11,270,771 kWh/year with a respectable performance ratio (PR) of 76.2% and a Capacity Utilization Factor (CUF) of 16%. Our findings not only highlight the potential of renewable energy but also provide important insights for future sustainable energy programs.

Assessment of Biomass, Carbon Stock and Sequestered CO2 in Teak (Tectona grandis L.f.) Plantation at Pt. Ravishankar Shukla University Campus, Raipur, Chhattisgarh, India

Carbon sequestration through tree plantation has significant role to mitigate the increasing level of CO2. Accurate measurement of carbon in teak plantations is required for estimating their contribution to global carbon stocks. The purpose of present work was to assess total biomass, carbon stock and sequestered CO2 in an 18 years old teak (Tectona grandis L. f.) plantation using allometric equations. Estimated total biomass, carbon stock and sequestered CO2 were 79.31, 37.28 and 136.66 t ha-1, respectively. Teak plantations in Chhattisgarh serve an important role in carbon sequestration, which contributes to climate change mitigation. It is a fast-growing species with robust, high-carbon wood, accumulates a substantial quantity of carbon over time. Expanding and sustaining these plants reduces atmospheric CO2 levels while also benefiting the region’s economy through timber production and forest-based livelihoods.

Structures of Forest Stands in Monospecific Reforestations Based on Tectona grandis Lf. (Verbenaceae) in the Sangoué Classified Forest in Côte d’Ivoire

Teak-based reforestation poses the challenge of sustainable development in terms of meeting economic, social and environmental needs. In order to meet the needs of populations for timber and contain anthropogenic pressures on flora, reforestation based on Tectona grandis is initiated in the Sangoué Classified Forest. Therefore, a diagnostic study is therefore essential to assess the effects of this practice on the environment. This study assessed the consequences of planting Tectona grandis on the conservation and restoration of the Sangoué classified forest. For this, the structural and floristic characteristics of teak stands at different stages of evolution were compared. The results showed that young plots have more plant species, are more diverse and more evenly distributed. Older plots have the highest densities and basal areas of stems, with an inverted J-shaped distribution. Young plots have the lowest densities and basal areas, as well as a more regular horizontal structure. The woody species introduced into reforestation are Tectona grandis, Gmelina arborea and Cedrela odorata. In the 33-year-old block, the total basal area value is 18.07 m² per hectare, then 13.72 m² per hectare in the 30-year-old block. As for the 25- and 28-year-old blocks, the basal area values per hectare are 12.61 m2 and 9.39 m2 respectively. Young plots promote natural regeneration and floristic diversity, while older plots present low floristic diversity with reduced structural balance. Introduced species have benefited more from teak planting than native ones. Teak planting may lead to profit, but it presents challenges for biodiversity. The impact of teak planting on the Sangoué classified forest differs depending on the stage of evolution of the stands. Therefore, it has advantages and disadvantages for forest restoration and conservation. The teak plantation needs to be adjusted to forest management.

A Review on Endangered Medicinal Plants of Melghat Forest in Amravati District

The Melghat Forest, located in the Western Ghats region of Maharashtra, is known for its rich biodiversity including a variety of plant and animal species. However, like many other forested area, the Melghat Forest is facing threats from various anthropogenic activities, such as deforestation, habitat destruction, and the introduction of exotic species. (Sharma, 2015) To address these challenges, the state government has implemented various conservation measures, including the establishment of a threatened fauna management framework. Some of these endangered medicinal plants are Saussaureea lappa, Picorrhiza kurroa, Ginkgo Biloba, Swertia chirata,Gymnema sylvestre,Tinospora cordifolia,Salaca oblonga,Holostemma,Celastrus paniculata,Oroxylum indicum, Glycyrrhiza glabra,Typophora indica,Bacopa monnieri,Rauwolfia serpentine. The most important species in these forests is Teak(Tectona Grandis).Teak forests occupy over 11500 sq.km.area which is about 1/5 of the area under forest department.The present investigation of some of the plants which are more important to human healthcare and may be extinct in future.

Role of extractives on the weathering of tropical and temperate wood species in two above-ground fields: coastal or terrestrial

The effect of heartwood extractives on natural weathering of 5 temperate (juniper, walnut, oak, pseudoacacia, and chestnut) and 9 tropical (wenge, teak, iroko, dahoma, moabi, okan, padauk, ipe, and tatajuba) wood species against abiotic degrading agents at two sites was investigated. Wood species were exposed to three-stage extraction, then extracted and un-extracted samples were exposed outdoors for 12 months in two above-ground test sites, coastal or terrestrial. Samples were evaluated regarding moisture content, color change, surface roughness, and surface chemistry (ATR-FTIR) at 1, 3, 6, and 12 months of exposure. Results indicate that roughness and color change increased as the exposure time increased. Among the temperate species, the least rough surfaces were found in juniper, while iroko, ipe, and wenge were for tropical species. The location did not statistically affect roughness. Temperate species generally showed rougher surfaces than tropical species. The remarkable color change occurred in the first 3 months in temperate wood species and between 3 and 6 months in extractive-rich tropical wood species. The highest color change was seen in samples extracted and exposed on the terrestrial test site, while the lowest was in un-extracted samples exposed on the coast. Padauk had the most color change, while moabi had the least. The surfaces of temperate species showed darkening while the surfaces of tropical species showed lightening during the weathering exposure. FTIR studies confirmed that the change in the surface chemistry of temperate species mostly occurs in the first month, while surface degradation of some tropical species can take up to 3 months.

Thermal modification’s influence on the color of Tectona grandis L.f. sapwood to resemble heartwood

The commercial value of teak wood is associated with its heartwood, which has a naturally darker color than sapwood. To reduce this color disparity, thermal modification can be used to homogenize the color between sapwood and heartwood by minimizing color differences. This research aimed to assess the effectiveness of thermal modification in making the color of teak sapwood similar to that of heartwood. Thermal modification was carried out at 160, 180, 200, and 220 °C for 150 min. Thermal modification of teak sapwood at 180 °C ensured greater color similarity to the heartwood of a fast-growing 16-year-old plantation. The material darkened with increasing process temperature. There was a change in the content of soluble substances, and hot water extraction had greater correlations with hue angle, lightness, and yellowness. Thermal modification also reduced the number of hydroxyl groups and improved the wood’s thermal stability.

Analysis of the plant hormone expression profile during somatic embryogenesis induction in teak (Tectona grandis).

Plant somatic embryogenesis (SE) is an efficient regeneration system for propagation. It involves the regulation of a complex molecular regulatory network encompassing endogenous hormone synthesis, metabolism, and signal transduction processes, induced through exogenous plant growth regulators. Previous studies have focused primarily on traditional propagation methods for Tectona grandis, but there is limited knowledge on SE and its hormonal regulatory mechanisms. In our study, different SE stages, including the nonembryogenic callus (NEC), embryogenic callus (EC), and globular and heart-shaped embryo (E-SEs) stages, were induced in teak cotyledons incubated on MS medium supplemented with 0.1 mg/L thidiazuron (TDZ). Morphological and histological observations indicated that EC primarily originates from the development of embryogenic cell clusters. During SE induction, the levels of six classes of endogenous hormones, IAA, CTK, ETH, ABA, SA, and JA, changed significantly. Transcriptome analysis revealed that endogenous hormones participate in SE induction in teak through various biological processes, such as biosynthesis, metabolism, and signal transduction pathways. We found that IAA biosynthesis primarily occurs through the IAM pathway during these three stages. The ETH receptor kinase gene SERF1 exhibited the highest expression levels in E-SEs. The ABA-, SA-, and JA-related signal transduction genes ABI3, NPR1, and JAZ exhibited no differential expression during different stages. Moreover, key encoding genes of SE regulators, including WUS, WOX and SERK, were differentially expressed during SE. In conclusion, this study offers insights into the roles of endogenous hormones and their interactions during SE induction.

PERANCANGAN NAKAS MULTIFUNGSI HIDDEN DRAWER DENGAN MIX MATERIAL

In the development of minimalist and modern interior design, space limitations are a major problem, especially in creating a multifunctional bedroom design. The bedroom is not only used as a place to rest, but is used as a place for storage, work, and other activities, so it requires several functional and efficient design solutions. One of the products developed is a multifunctional nightstand that has been equipped with more storage, hidden drawers, and a table top that can be directed to the bed. This product is designed using a combination of teak wood, plywood, and veneer with natural finishing, giving a natural and aesthetic impression. Research on this product uses quantitative method research through filling out questionnaires to respondents. The process of designing this product follows by using the design thinking method which involves five stages, namely the empathize, define, ideate, prototype, and test stages. The final result is a prototype of a multifunctional nightstand that has been equipped with woven rattan to add an aesthetic impression. The data shows that this product obtained score of 91.05%, which shows that this product is very attractive and meets the needs as a creative solution to the problem of limited space.

Tectona Grandis seed powder and Mangifera Indica leaf powder as bio adsorbents for removal of methylene blue from aqueous solution

This study intends to describe the use of modified Tectona Grandis seed powder (TG) and Mangifera Indica leaf powder (MI) as adsorbent materials in the process of removing Methylene Blue (MB) from the wastewater. Nitric acid (HNO3) was used to chemically modify the plant material. Thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray diffraction (XRD) were utilized to analyze the modified bio adsorbents (TG and MI). The adsorbents' ideal specific surface area and pore volume were measured using the N2 adsorption/desorption technique through detailed characterization. The efficiency of the adsorbents in eliminating the MB dye was investigated in relation to the effects of adsorbent dose (2–10 mg), pH (3, 7 and 10), exposure time (10–90 min), temperature (30 °C, 50 °C and 70 °C), and dye concentration (20–100 mg/L) through batch adsorption studies. The models proposed by Langmuir, Freundlich, and Dubinin Raduskevich (D-R) could explain the binding results for MB on TG and MI. The adsorption process were more in line with the Langmuir model than the other models. At neutral pH (7), TG showed maximum percentage removal of 73.12 % whereas, MI powder showed a maximum percentage removal of 50.5 %. Time and adsorbent dosage have both led to an increase in the percentage of methylene blue elimination. The experimental results were confirmed by density functional theory (DFT) calculations, which revealed energy gaps (ΔE) of 4.57 eV and 7.882 eV for MB and TG/MI, respectively. Following complexation, a change of 16.56 eV was observed, indicating a stronger MB adsorption tendency across the modified TG/MI surface. The primary components of the mechanism of MB adsorption include hydrogen bonds, n-π, π-π, and electrostatic interactions, as per the results of Monte Carlo(MC) simulation calculations. According to our findings, TG and MI are affordable biomaterials for treating wastewater in an ecologically responsible and green manner.

Effects of salinity and pre-sowing treatments on the growth parameters of the Tectona grandis L.F. seedlings under nursery condition

Effects of salinity and pre-sowing treatments on the growth parameters of the Tectona grandis L.F. seedlings under nursery condition

Adsorption of lead from aqueous solution using Teak (Tectona grandis) sawdust

ABSTRACT Sawdust, a wood waste was used to prepare activated carbon, and its adsorptive performance in removing Pb2+ from wastewater was investigated. Modification of Teak sawdust was carried out using orthophosphoric acid. Physicochemical and adsorptive parameters of activated sawdust (ASD) were examined using Scanning Electron Microscope, Fourier Transform Infra-red, and EDX respectively. SEM images of ASD revealed defined pores, adsorbing Pb2+ ions to its surface, while the spectra showed the presence of functional groups accountable for Pb2+ ions adsorption. Langmuir, Freundlich, Temkin, and D-R Isotherm models were deployed to study the experimental data. Langmuir isotherm (R 2 = 0.9891) described the data with an adsorption monolayer capacity of 112.4 mg/g at 303 K. The D-R isotherm model depicted the mean free energy ranging from 1.29 to 4.08 kJ/mol, suggesting physisorption adsorption. The pseudo-second-order kinetic model was best fitted for the sorption process with R 2 values between 0.9996 and 0.9999. Adsorption thermodynamics reflected that the process was endothermic and spontaneous. Therefore, the utilisation of an economical activated carbon modified from Teak (Tectona grandis) sawdust was efficient for lead uptake from wastewater.

Gender Role in Teak Plantation at Paklay District Sayaboury Province, Lao PDR

This paper investigates the gender role in teak (Tectona grandis) plantation in Paklay District, Xayaboury Province. There are two objectives of study: 1) to analyze the state of gender equality in plantation activities, and 2) to analyze the satisfaction of men and women in undertaking their plantation responsibilities. This research gathered data from 124 families in the three villages, which corresponded to 100% of those growing teak. The household interview gathered both quantitative and qualitative data using the data management program KOBO toolbox. The results of showed that men and women participate equally in nine of 12 plantation activities (or 75%) being land clearing, soil preparation, planting lines, planting, tree maintenance, pruning-thinning, building a fire break, weeding and marketing (selling). In terms of satisfaction, women expressed themselves to be ‘very satisfied’ on a Likurt scale, whereas men were only ‘satisfied’. It was found that men and women discussed the work required in the teak plantation together and divided their responsibilities in accordance with whether the work was perceived to be light or heavy and with bodily strength of those in the household. The gender equality and mutual respect between the sexes from this cooperation meant that both men and women were satisfied.

Optimization of Wood Waste through the Design of Multifunctional Clocks Using KANO and QFD Methods to Increase the Economic Revenue of CV. PIRANTI

One of the companies engaged in the teak wood furniture industry and interior design of the room is CV. PIRANTI. The problem found by researchers is the occurrence of the accumulation of waste of wood which becomes fuel for wood oven, causing environmental pollution. As such, to minimize wood- waste accumulation—a scenario in which the accumulation of timber waste in December 2018, January 2019, and February 2019 totaled 177 kg—the author will waste the wood into clocks that have value that can also add economic income for the company. The KANO and QFD methods are used in this study. This research is aimed at: 1) Product design planning using waste wood; 2) Product design planning using the Kano and QFD methods; and 3) Knowing the increase in income of CV. Tools by utilizing waste wood. The result of this research is 1) can process the waste of wood using the method KANO, 2) can know the level of satisfaction and the interests of customers using QFD method, 3) and can know the advantages of wood waste treatment when used Multifunction Wood. In processing QFD data, obtained 2 types of product design. Got a price calculation with a price margin of 25% for the product, where the price ranged from 52 000 rupiah to 65 000 rupiah per product with a profit of 13 000 rupiahs for product A, and product B with prices ranging from 46 000 rupiah to 57 500 rupiah with a profit of 11 500 rupiah per product.

EFFECT OF LIQUID SMOKE FROM LIGNOCELLULOSE WASTE ON THE GROWTH OF Orthosiphon aristatus (Blume) Miq. UNDER A HYDROPONIC WICK SYSTEM

Liquid smoke is a by-product of the lignocellulosic pyrolysis process and has long been used for various purposes, including as a plant growth stimulant. The use of liquid smoke for the growth of medicinal plants, especially Orthosiphon aristatus (Blume) Miq., is yet to be widely carried out. This study aimed to determine the effect of liquid smoke concentration on the phytotoxicity of cat whiskers, the growth response of cat whiskers in a wick hydroponic system for sustainable production practices, and the phenol and acetic acid contents in the liquid smoke solution. The measured growth response parameters included leaf, stem, root, total biomass, plant height, root length, stem diameter, and sinensetin levels. This study used liquid smoke collected using the stratification technique at 200 ⁰C and 400 ⁰C from three raw waste materials: pine wood, teak wood, and bamboo. The concentrations of liquid smoke in the hydroponic solution media were 0.25%, 0.5%, 1%, and 2%. The results showed that liquid smoke at 400 ℃ and concentrations of ≥3% caused significant phytotoxicity, including leaf wilting, necrosis, chlorosis, and plant death, owing high phenol and acetic acid levels. Furthermore, Andong bamboo liquid smoke (ABLS) at a concentration of 0.25% collected at 200 ⁰C generally gave better results for the growth of the cat whiskers plant on hydroponics. It increased sinensetin content compared to the control and other treatments. These findings suggest that stratifying pyrolysis temperatures and properly diluting liquid smoke can be used as growth stimulants while minimizing phytotoxicity. Keywords: cat whiskers, hydroponic, liquid smoke, plant growth, pyrolysis

Mulching tree leaves improve the growth, yield, and yield components of hybrid maize

The experiment was carried out at the Agroforestry Farm, Department of Agroforestry, Bangladesh Agricultural University, Mymensingh from November 2019 to March 2020 to assess the impact of tree leaf mulching on the growth, yield attributes, and yield of maize. The study used a Randomized Complete Block Design with three replications and six treatments. These treatments were: T0=Control (no mulch), T1=Akashmoni (Acacia auriculiformis) tree leaf mulch, T2=Segun (Tectona grandis) tree leaf mulch, T3=Kalo koroi (Albizia lebbeck) tree leaf mulch, T4=Jhau (Casuarina equisetifolia) tree leaf mulch, and T5=Jackfruit (Artocarpus heterophyllus) tree leaf mulch. The results showed that the Kalo koroi tree leaf mulch (T3) led to the highest values for various parameters such as plant height, number of effective tillers per plant, number of leaves per plant, leaf length, leaf diameter, number of cobs per plant, length, and diameter of cob, the weight of single cob, number of grains per cob, grain weight per cob, 100-grain weight, and grain yield of maize (221.18 cm, 0.93, 17.29, 79.26 cm, 7.30 cm, 4.18, 1.70, 21.11 cm, 6.08 cm, 212.12 g, 453.85 g, 138.91 g, 30.60 g, and 11.81 t/ha). Conversely, the lowest values were obtained in the control (T0) (no mulch), followed by T2 and T1 treatments (209.39 cm, 0.37, 12.5, 72.48 cm, 4.62 cm, 1.50, 15.03 cm, 4.44 cm, 202.19 g, 421.56 g, 111.55 g, 26.46 g, and 8.35 t/ha). Among the various tree leaf mulch treatments, it was found that the Kalo koroi tree leaf mulch performed better for vegetative growth, yield, and yield-contributing attributes in maize compared to the no mulch treatment. Therefore, it was suggested that tree leaf mulches could be a potential alternative to traditional mulches in maize cultivation. Res. Agric. Livest. Fish. Vol. 11, No. 2, August 2024: 205-214

Factors Affecting the Decision to Purchase Teak Products for Consumption by Consumers in Luangprabang District, Luang Prabang province

This research aims to investigate the situation of consumers purchasing teak products and decision to buy teak product in LuangPrabang. Using a questionnaire to gather data from a sample group of 380 individuals who have purchased teak products. And using the SPSS program to analyze the percentage of these consumers. The results of the study found that the situation when buying teak wood products is: ceiling edge 98.68%, ceiling wood 92.10%, kitchen cabinet 69.21%, chair 55.26%, table 54.73%, stairs 53.94%,bed 52.89%, plane wood 52.63%, door edge 47.36%, window frame 28.68%, door frame 26.31%, pillar wood 9.21%, air intake 6.57%, and finally sofa 4.73%. Expenses for more than 5 million kip cover 68.80%, 3 to 5 million cover 78.00%, 1 to 3 million cover 70.00%, and lower than 1 million kip cover 54.80%. 95% of buyers choose to buy in front of the store, 59% call to order for the store to pick up and deliver, and 49% order online. The study also found that 95% of the reasons are because rose wood or led wood is hard to find and the price is expensive; 65% of Luang Prabang is still plentiful of teak; there is a lot of teak wood; and teak wood is beautiful and lighter than other wood; and 35% because there is no choice.Result also found that the factors that making consumers decide to buy teak products are quality, appearance, easy to find and purchase, price and detail of the product with a statistical significance level of less than .05.

Production and Properties Chip Block Pallets from Teak Wood (Tectona grandis sp.) Biomass

Production and Properties Chip Block Pallets from Teak Wood (Tectona grandis sp.) Biomass

Utilization of Teak Wood Powder as a Carbon Source in LiFePO_4/C Cathode Lithium-Ion Batteries

Utilization of Teak Wood Powder as a Carbon Source in LiFePO_4/C Cathode Lithium-Ion Batteries