Search Result of "Leucaena leucocephala"

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การประชุมวิชาการ

Effect of different additives on ensiling Leucaena leucocephala

ผู้แต่ง:ImgDr.Theera Rukkwamsuk, Associate Professor, ImgMr.Jaturong Wongsanit, Lecturer, ImgT. Schonewille, ImgH. Everts, ImgW. Hendriks,

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การประชุมวิชาการ

Effect of Trypsin Inhibitors from Seeds of Leucaena leucocephala on Corcyra cephalonica and Tribolium castaneum

ผู้แต่ง:ImgS. Wuthisawasdi, ImgDr.Boongeua Vajarasathira, Associate Professor, Img A. Engkagul,

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Growth, Biomass Productivity and Energy Characteristics of Prosopis julifl ora (Sw.) DC. and Leucaena leucocephala (Lam.) De Wit in Afar Region, Ethiopia)

ผู้เขียน:ImgAhmed Seid Ali, Imgดร.สายัณห์ ทัดศรี, ศาสตราจารย์, Imgดร.สราวุธ รุ่งเมฆารัตน์, ผู้ช่วยศาสตราจารย์, Imgดร.เกรียงไกร แก้วตระกูลพงษ์, ผู้ช่วยศาสตราจารย์

สื่อสิ่งพิมพ์:pdf

Abstract

The performance of Prosopis julifl ora and Leucaena leucocephala was investigated at plant spacings of 1 ? 0.5, 1 ? 1, 1 ? 1.5, 1 ? 2 and 1 ? 2.5 m corresponding to a tree density of 20,000, 10,000, 6,666, 5,000 and 4,000 ha?1, respectively, to identify the most suitable plant spacing for the optimum biomass harvest per unit area. The overall performance of L. leucocephala was superior to P. julifl ora under most parameters measured, except for the calorifi c value. The performance of both species in terms of the plant height, stem diameter and number of trunks was affected by the population density at age 6 mths and there were signifi cant increases at wider spacings (1 ? 2 and 1 ? 2.5 m) when the age advanced to 12 mth. There were signifi cant differences in the biomass production per tree and better total above ground biomass results were obtained with plantings at wider spacings at both 6 and 12 mth of age. However, the total above ground biomass yield per hectare of both species increased markedly with increasing plant density at both 6 and 12 mth of age and this revealed that both species can be grown at closer spacing (1 ? 0.5 m).

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 047, Issue 5, Sep 13 - Oct 13, Page 663 - 674 |  PDF |  Page 

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Physicochemical Characteristics of Wood Vinegars from Carbonization of Leucaena leucocephala, Azadirachta indica, Eucalyptus camaldulensis, Hevea brasiliensis and Dendrocala

ผู้เขียน:ImgYongyuth Theapparat, ImgAusa Chandumpai, ImgWichitra Leelasuphakul, Imgนิคม แหลมสัก, ImgChanita Ponglimanont

สื่อสิ่งพิมพ์:pdf

Abstract

The physicochemical characteristics were evaluated of eight wood vinegars from the carbonization of five wood species—Leucaena leucocephala (Katin), Azadirachta indica (Sadao), Eucalyptus camaldulensis, Hevea brasiliensis (rubber wood) and Dendrocalamus asper (bamboo). The vinegars were produced by heating wood samples up to 400 ?C in a Thai-Iwate kiln and were compared with two commercial products. The quality assessments of all wood vinegars were determined according to criteria from the Charcoal Handbook. The results showed that all wood vinegar samples appeared to be good quality in terms of odor, color and transparency. The pH (2.9–3.5) and total soluble tar (0.325–0.963 % by weight) also met the standard criteria for the pH (around 3) and total soluble tar (not more than 3%). The values of the specific gravity of only two products, from rubber wood (1.012 g.mL-1) and bamboo (1.010 g.mL-1) were within the acceptance criteria of 1.010–1.050 g.mL-1. Chemical compositions of wood vinegars as determined qualitatively by gas chromatography/mass spectrometry and quantitatively by gas chromatography/flame ionized detector consisted of acetic acid as the largest component (30.45–70.60 mg.mL-1). A high number of phenol derivatives (16 compounds) were found and those in higher concentrations were 4-propyl-2-methoxyphenol (5–11 mg.mL-1) followed by 2-methylphenol (2–4 mg.mL-1). An acetic acid concentration from the eight samples whose presence was indicated by pKa at 4.7 was mainly responsible for the pH values as shown in the good correlations of plots between pH and acetic acid concentrations (Correlation coefficient, R = 0.92). The total acid contents of the ten wood vinegars as determined by titration with 0.1 N sodium hydroxide showed poor correlations with pH (R = 0.65) due to the presence of a variety of organic acids and phenolic compounds which may have affected proton transition. The specific gravity showed good correlations with total soluble tar and degree Brix (R = 0.87 for both); in turn the degree Brix showed good correlation with the total soluble tar (R = 0.87). Thus, the degree Brix which was easy to determine could be used as a general indicator of total soluble tar. The amount of total soluble tar signified the presence of phenolic compounds, of which previous studies suggested antifungal activity and usefulness as wood preservatives. Phenolic compounds were also confirmed by the ultraviolet absorption maximum (?max) at 268–274 nm.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 048, Issue 6, Nov 14 - Dec 14, Page 916 - 928 |  PDF |  Page 

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