rudy hidayah - Academia.edu (original) (raw)
Papers by rudy hidayah
[Yogyakarta] : Universitas Gadjah Mada, 2013
Young-age timbers from the community forest in Kulon Progo experiences the increasing demand for ... more Young-age timbers from the community forest in Kulon Progo experiences the increasing demand for utilization. On the other side, the information with regard to the quality and variation within the properties of teak wood is limited to the consumers. The concentration of inorganic materials and acidity properties of the wood affects to its processing and utilization. This circumstance leads to the curiosity to address the properties of this kind of wood through the radial variation and site growth. The research used three trees in each three different site growth i.e. Kalibawang, Temon and Madiun. The samples used were 5 cm-thicknes disks that taken from the bottom side of the tree. The radial variation was divided into three different parts which were sapwood, outer and inner heartwood. The wood powder had been taken from each different part and was ground to 40-60 mesh in order to examine the ash content (ASTM 1102-56), acid insoluble ash content (TAPPI T 244 om88), inorganic element content (Ca, K, Mg, Na, Fe, Mn, dan Cu) and pH value. Data analysis was conducted using two-ways analysis of variance and HSD (Honesty Significant Difference). Pearson correlation was used to find the correlation among the parameters. The levels range of ash content and insoluble acid ash content of Kulon Progo�s teak are 0.65-2.99% and 0.34-2.39% respectively. The range of inorganic element content for Ca, K, Na, Mg, Fe and Cu are469,73 � 1447,33 ppm, 248,02 � 3760,50 ppm, 358,46 � 935,83 ppm, 559,01 � 1197,85 ppm, 0 � 31,14 ppm respectively, while the pH range is 5,66 � 6,27. The interaction between factors affects significantly the values of acid insoluble ash contents, and K content. The growth site affects significantly to the values of ash, Na and Ca content. Radial factor only affects the ash content. As defined by Pearson correlation analysis from all samples, it is found that strong correlation in the heartwood between the ash content and acid insoluble ash content (r = 0,92), while the ash content also has a significant correlation to K content (r = 0,87) in the sapwood. From the analysis is also measured that the K content has strong correlation to Na content (r = 0,67). However, the negative correlation was significantly found in the same part of wood for Na and Ca (r = - 0,60). The pH value is significantly correlated to the Ca content (r=0.41) in the data combination of the sap and heartwood parts
Inorganic materials and acidity in the wood has been proved to affect the wood properties. The pr... more Inorganic materials and acidity in the wood has been proved to affect the wood properties. The previous paper in this series reported on the physical and chemical properties of teak wood from community forests. Therefore, this study aimed to explore the content of inorganic materials and acidity of teak wood grown in the 3 sites (Panggang, Playen, Nglipar) with different ecological attributes from community forests in Gunungkidul. The evaluated parameters were pH values, the contents of ash (ASTM D-1102), silica and silicates (SNI 14-1031-1989), and inorganic matters (Ca, Mg, K, Na, Fe, Mn, and Cu) by means of Atomic Absorption Spectrophotometer. The ranges of ash and silica-silicates content were 0.38-2.62%, and 0.01-1.17%, respectively. The ranges of inorganic element content for Ca, K, Mg, Na, and Fe were 408-2919 ppm; 69-23705 ppm; 947-1653 ppm; 4-31 ppm; and 0-326 ppm, respectively whereas Mn and Cu were not detected in any samples. Further, the obtained pH values range was 5.23-6.98. On the basis of analysis of variance, the contents of ash, silica-silicates, and Na were affected significantly by site and radial direction (sapwood, outer heartwood, and inner heartwood) factors. The woods from Playen (middle zone/Ledok Wonosari) had significantly high in ash and silica-silicate contents. By Kruskal-Wallis test, radial direction factor affected significantly the levels of Ca, K, and Mg. As defined by Pearson's correlation analysis, it was found a strong correlation between the ash and silica-silicates contents (r=0.77-0.88), as well as between the ash-Ca content (r=-0.51) and the ash-Mg content (r=0.59) in the heartwood part. In the inorganic element levels, the strongest correlation was measured between Ca-Mg content (r=-0.46). Special attention should be given to the comparatively high amounts of the silica-silicates content in the observed samples as it would dull cutting tools considerably.
Wood Research Journal, 2020
Information concerning ash materials and acidity (pH values) within the wood of teak (Tectona gra... more Information concerning ash materials and acidity (pH values) within the wood of teak (Tectona grandis L.f.) plantations is especially limited. Samples taken from the stands of Perhutani plantation (Madiun and Randublatung) and community forests in Kulon Progo (Temon and Kalibawang) were analyzed to determine the ash content, metallic elements constituting the ash fraction, as well as pH values. The ranges of ash content were 0.55-3.88% whereas acid insolube ash content (silica/silicates) were 0.12-2.45%. The main four inorganic elements in wood were assayed by atomic absorption. The levels of these metals ranged from 340-4774 ppm for calcium, 17-4399 ppm for potassium, 143-1676 ppm for magnesium, and 0247 ppm for iron. Further, the pH values varied from 5.33-7.25. Differences of inorganic variables and pH values in wood were found between trees of different growth-site and radial position. The variation among the different sites was significant in the contents of silica, calcium, ma...
Jurnal Ilmu Kehutanan, 2016
Sifat mekanika dari kayu gergajian adalah persyaratan terpenting dalam banyak penerapan khususnya... more Sifat mekanika dari kayu gergajian adalah persyaratan terpenting dalam banyak penerapan khususnya untuk keperluan konstruksi. Paper ini merupakan lanjutan dari penelitian sifat fisika kayu di tiga tempat tumbuh (Panggang, Playen, Nglipar) hutan rakyat Kabupaten Gunungkidul. Pengujian sifat mekanika dilakukan mengacu pada British Standards 373:57. Hasil penelitian menunjukkan bahwa kayu yang diteliti termasuk dalam kelas kuat II-III. Dari perhitungan analisis varian, tempat tumbuh berpengaruh nyata pada modulus patah (MoR) keteguhan lengkung statik, keteguhan tekan tegak lurus serat maksimum, keteguhan geser, dan kekerasan. Secara keseluruhan, kecuali untuk nilai MoR, sampel kayu dari Nglipar memberikan nilai kekuatan yang lebih tinggi. Pengaruh arah aksial dan radial pohon secara umum tidak begitu terlihat pada semua parameter kekuatan kecuali di keteguhan belah. Meskipun berkorelasi secara linier, hanya korelasi moderat yang diamati dari hubungan sifat mekanika (MoR/keteguhan geser...
HABITAT, 2021
Indonesia government pays little attention to address impending threat of the existences of uplan... more Indonesia government pays little attention to address impending threat of the existences of upland smallholder farmers due to insufficient farm income. This condition poses an imminent threat to national food security. One of the initiatives to address the condition is participatory action research project conducted by Faculty of Forestry UGM with 12 upland smallholder farmers in Wonogiri regency from 2016 to 2018. The result of the participatory action research project showed that although the 12 smallholder farmers practice cropland agroforestry system in marginal land, their increased rice production could improve farm income, be similar in rice field and support national food security. Therefore, this study aimed at investigating lesson-learned of the participatory action research project. This study was conducted on January-March 2020, used participant observation and semi-structure interview methods to collect data from the 12 smallholder farmers. After the collected data were...
Although there is increasing emphasis on targeting of improved technology towards poor and female... more Although there is increasing emphasis on targeting of improved technology towards poor and female farmers, few adoption studies assess the uptake of new practices by these groups in a comprehensive manner. In this study, community members used the wealth ranking method to identify the different wealth groups in their communities, to determine each household's wealth status, and to assess the association of wealth and different types of households with the planting of improved tree fallows, a practice for improving crop yields. There were no significant differences between the proportions of women and men planting improved fallows nor were there differences between single women and female heads of households who were married. There was some evidence of association between planting improved fallows and wealth. That 22% of the 'poor' group and 16% of the 'very poor' group were planting them suggests that there are no barriers preventing low-income households from doing so. Moreover , the proportion of females, poor, and very poor people planting improved fallows varied considerably among villages, suggesting that opportunities exist for increasing their use of the technology. Whereas the use of mineral fertilizer is strongly associated with high-income, male farmers, improved fallows appear to be a gender-neutral and wealth-neutral technology. Poor
[Yogyakarta] : Universitas Gadjah Mada, 2013
Young-age timbers from the community forest in Kulon Progo experiences the increasing demand for ... more Young-age timbers from the community forest in Kulon Progo experiences the increasing demand for utilization. On the other side, the information with regard to the quality and variation within the properties of teak wood is limited to the consumers. The concentration of inorganic materials and acidity properties of the wood affects to its processing and utilization. This circumstance leads to the curiosity to address the properties of this kind of wood through the radial variation and site growth. The research used three trees in each three different site growth i.e. Kalibawang, Temon and Madiun. The samples used were 5 cm-thicknes disks that taken from the bottom side of the tree. The radial variation was divided into three different parts which were sapwood, outer and inner heartwood. The wood powder had been taken from each different part and was ground to 40-60 mesh in order to examine the ash content (ASTM 1102-56), acid insoluble ash content (TAPPI T 244 om88), inorganic element content (Ca, K, Mg, Na, Fe, Mn, dan Cu) and pH value. Data analysis was conducted using two-ways analysis of variance and HSD (Honesty Significant Difference). Pearson correlation was used to find the correlation among the parameters. The levels range of ash content and insoluble acid ash content of Kulon Progo�s teak are 0.65-2.99% and 0.34-2.39% respectively. The range of inorganic element content for Ca, K, Na, Mg, Fe and Cu are469,73 � 1447,33 ppm, 248,02 � 3760,50 ppm, 358,46 � 935,83 ppm, 559,01 � 1197,85 ppm, 0 � 31,14 ppm respectively, while the pH range is 5,66 � 6,27. The interaction between factors affects significantly the values of acid insoluble ash contents, and K content. The growth site affects significantly to the values of ash, Na and Ca content. Radial factor only affects the ash content. As defined by Pearson correlation analysis from all samples, it is found that strong correlation in the heartwood between the ash content and acid insoluble ash content (r = 0,92), while the ash content also has a significant correlation to K content (r = 0,87) in the sapwood. From the analysis is also measured that the K content has strong correlation to Na content (r = 0,67). However, the negative correlation was significantly found in the same part of wood for Na and Ca (r = - 0,60). The pH value is significantly correlated to the Ca content (r=0.41) in the data combination of the sap and heartwood parts
Inorganic materials and acidity in the wood has been proved to affect the wood properties. The pr... more Inorganic materials and acidity in the wood has been proved to affect the wood properties. The previous paper in this series reported on the physical and chemical properties of teak wood from community forests. Therefore, this study aimed to explore the content of inorganic materials and acidity of teak wood grown in the 3 sites (Panggang, Playen, Nglipar) with different ecological attributes from community forests in Gunungkidul. The evaluated parameters were pH values, the contents of ash (ASTM D-1102), silica and silicates (SNI 14-1031-1989), and inorganic matters (Ca, Mg, K, Na, Fe, Mn, and Cu) by means of Atomic Absorption Spectrophotometer. The ranges of ash and silica-silicates content were 0.38-2.62%, and 0.01-1.17%, respectively. The ranges of inorganic element content for Ca, K, Mg, Na, and Fe were 408-2919 ppm; 69-23705 ppm; 947-1653 ppm; 4-31 ppm; and 0-326 ppm, respectively whereas Mn and Cu were not detected in any samples. Further, the obtained pH values range was 5.23-6.98. On the basis of analysis of variance, the contents of ash, silica-silicates, and Na were affected significantly by site and radial direction (sapwood, outer heartwood, and inner heartwood) factors. The woods from Playen (middle zone/Ledok Wonosari) had significantly high in ash and silica-silicate contents. By Kruskal-Wallis test, radial direction factor affected significantly the levels of Ca, K, and Mg. As defined by Pearson's correlation analysis, it was found a strong correlation between the ash and silica-silicates contents (r=0.77-0.88), as well as between the ash-Ca content (r=-0.51) and the ash-Mg content (r=0.59) in the heartwood part. In the inorganic element levels, the strongest correlation was measured between Ca-Mg content (r=-0.46). Special attention should be given to the comparatively high amounts of the silica-silicates content in the observed samples as it would dull cutting tools considerably.
Wood Research Journal, 2020
Information concerning ash materials and acidity (pH values) within the wood of teak (Tectona gra... more Information concerning ash materials and acidity (pH values) within the wood of teak (Tectona grandis L.f.) plantations is especially limited. Samples taken from the stands of Perhutani plantation (Madiun and Randublatung) and community forests in Kulon Progo (Temon and Kalibawang) were analyzed to determine the ash content, metallic elements constituting the ash fraction, as well as pH values. The ranges of ash content were 0.55-3.88% whereas acid insolube ash content (silica/silicates) were 0.12-2.45%. The main four inorganic elements in wood were assayed by atomic absorption. The levels of these metals ranged from 340-4774 ppm for calcium, 17-4399 ppm for potassium, 143-1676 ppm for magnesium, and 0247 ppm for iron. Further, the pH values varied from 5.33-7.25. Differences of inorganic variables and pH values in wood were found between trees of different growth-site and radial position. The variation among the different sites was significant in the contents of silica, calcium, ma...
Jurnal Ilmu Kehutanan, 2016
Sifat mekanika dari kayu gergajian adalah persyaratan terpenting dalam banyak penerapan khususnya... more Sifat mekanika dari kayu gergajian adalah persyaratan terpenting dalam banyak penerapan khususnya untuk keperluan konstruksi. Paper ini merupakan lanjutan dari penelitian sifat fisika kayu di tiga tempat tumbuh (Panggang, Playen, Nglipar) hutan rakyat Kabupaten Gunungkidul. Pengujian sifat mekanika dilakukan mengacu pada British Standards 373:57. Hasil penelitian menunjukkan bahwa kayu yang diteliti termasuk dalam kelas kuat II-III. Dari perhitungan analisis varian, tempat tumbuh berpengaruh nyata pada modulus patah (MoR) keteguhan lengkung statik, keteguhan tekan tegak lurus serat maksimum, keteguhan geser, dan kekerasan. Secara keseluruhan, kecuali untuk nilai MoR, sampel kayu dari Nglipar memberikan nilai kekuatan yang lebih tinggi. Pengaruh arah aksial dan radial pohon secara umum tidak begitu terlihat pada semua parameter kekuatan kecuali di keteguhan belah. Meskipun berkorelasi secara linier, hanya korelasi moderat yang diamati dari hubungan sifat mekanika (MoR/keteguhan geser...
HABITAT, 2021
Indonesia government pays little attention to address impending threat of the existences of uplan... more Indonesia government pays little attention to address impending threat of the existences of upland smallholder farmers due to insufficient farm income. This condition poses an imminent threat to national food security. One of the initiatives to address the condition is participatory action research project conducted by Faculty of Forestry UGM with 12 upland smallholder farmers in Wonogiri regency from 2016 to 2018. The result of the participatory action research project showed that although the 12 smallholder farmers practice cropland agroforestry system in marginal land, their increased rice production could improve farm income, be similar in rice field and support national food security. Therefore, this study aimed at investigating lesson-learned of the participatory action research project. This study was conducted on January-March 2020, used participant observation and semi-structure interview methods to collect data from the 12 smallholder farmers. After the collected data were...
Although there is increasing emphasis on targeting of improved technology towards poor and female... more Although there is increasing emphasis on targeting of improved technology towards poor and female farmers, few adoption studies assess the uptake of new practices by these groups in a comprehensive manner. In this study, community members used the wealth ranking method to identify the different wealth groups in their communities, to determine each household's wealth status, and to assess the association of wealth and different types of households with the planting of improved tree fallows, a practice for improving crop yields. There were no significant differences between the proportions of women and men planting improved fallows nor were there differences between single women and female heads of households who were married. There was some evidence of association between planting improved fallows and wealth. That 22% of the 'poor' group and 16% of the 'very poor' group were planting them suggests that there are no barriers preventing low-income households from doing so. Moreover , the proportion of females, poor, and very poor people planting improved fallows varied considerably among villages, suggesting that opportunities exist for increasing their use of the technology. Whereas the use of mineral fertilizer is strongly associated with high-income, male farmers, improved fallows appear to be a gender-neutral and wealth-neutral technology. Poor