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PENGARUH DIAMETER POHON, UMUR DAN KADAR STIMULAN TERHADAP PRODUKTIVITAS GETAH R Sudradjat; Dendi Setyawan; S Sumadiwangsa
Jurnal Penelitian Hasil Hutan Vol 20, No 2 (2002): Buletin Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.2002.20.2.143-158

Abstract

This report revealed the results of assesing the effect of diameter of pine trees, ages and dosages of stimulants (i.e. socepas agent). and harvesting period on the productivity of their exudates. The growing sites of the harvested pine trees were situated at three different blocks (i.e. I, II. and III). These blocks could represent the ages of the standing pine trees (i.e. 15. 18. 24 years old). Ages of trees in block III were the oldest, followed by that of blocks I and II, as consecutively, the youngest and second youngest. The three blocks further were each divided administratively into their own regional areas, called a stripes.For block I. the averages of exudate production varies in the range of 44.63 - 120.25 gram/ tree/period. Different dosages of socepas agent effected significantly the exudates productivity, i.e. the highest at 15 percent socepas agent (i.e. 80.08 gram/tree/period),followed in decreasing order at 20 percent socepas agent (76. 76 gram/tree/period). and at 10 percent socepas agent (61. 79 gram/tree/period). and finally at zero percent stimulant or control (47.81 gram/tree/period). Different harvesting periods. however. did not affect the exudates productivity significantly. Conversely, the diameter of pine trees affected significantly the productivity with a positive linear trend. This trend applied to whatever stripes in which the harvested trees were situated.For block II, harvesting period brought about significant effect on productivity where the highest was obtained at the second period (62.89 gram/tree). followed by decreasing order at the third period (56.31 gram/tree). and at the first period (47. 71 gram/tree), respectively. The variation of exudate productivity was around 39.21 - 81.97 gram/tree/period. This productivity was significantly affected by dosages of socepas. where the highest was at 20 percent dosage (68.08 gram/tree/period). followed at 10 percent (54. 04 gram/tree/period).at 15 percent (52.15 gram/tree/period), and finally at zero percent stimulant or control (48.35 gram/tree/period).Similar in block I. there was positive linear trend between tree diameter and exudates productivity of the pine trees, regardless of their locations in stripes.For block III. harvesting periods also affected the productivity, where the highest was from the third period (50. 71 gram/tree), subsequently from second (49.89 gram/tree). and at last from the first period (43.56 gram/tree). The productivity indicated some variation in the range of 36.06 - 68.34 gram/tree/period.Socepas stimulant affected significantly the exudates production. i.e. the highest at 20 percent socepas (54. 71 gram/tree/period). followed consecutively at 15 percent socepas (51.05 gram/tree/period). at 10 percent (44.28 gram/tree/period). and ultimately at zero percent socepas (42.17 gram/tree/ period). Similar also in blocks I and II. positive linear trend occurred between exudates production and diameters of trees, despite being in different stripes.Ages of the pine trees. as represented by the different blocks, affected production. in that the older the ages the lower the exudates productivity. The average productivities from the trees in block I (as the youngest i.e. 15 years old) and in block II (as the second youngest i.e. 18 years old) were 71.46 gram/tree and 46.07 gram/tree, respectively. Meanwhile, the productivity from block III (as the oldest i.e. 24 years old) was 41.17 gram/tree.
PENGARUH KADAR STIMULAN TERHADAP PRODUKTIVITAS GET AH PO HON PINUS (Pin us merkussi Jungh. et de Vriese) PADA BERBAGAI TINGKAT UMUR DI DAERAH SUMEDANG, JAWA BARAT Erra Yusnita; S Sumadiwangsa; Dendi Setyawan; Erik Dahlian
Jurnal Penelitian Hasil Hutan Vol 19, No 3 (2001): Buletin Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5640.851 KB) | DOI: 10.20886/jphh.2001.19.3.165-174

Abstract

Pine (Pinus merkusii Jungh et.de. Vriese) trees have an important role on related industries endeavoring in forest products, due to the widespread utlilization on their potential wood as well as gum matters.Production of pine gum can be affected by the manner of its tapping, kind and percentage of stimulant agent, age and diameter of trees. and genotype factors. Related as such, this investigation was intended lo evaluate the effect of pine tree diameters and stimulant percentage on productivity of pine tapping. In addition, this investigation was also to evaluate whether the tapping orientations (i.e. north­. east­, south­, and west­directions) affected the gum productivity. The main aim was to find out which tapping manner turned out to be the most efficient, the most economic and the safest either lo the trees or to the tapping worker themselves and end up with the optimum and continuity of pine gum production. The pine trees selected for this investigation were the ones growing in Sumedang region, West Java (Indonesia).Results revealed that age of pine trees significantly affecfed the gum production. Tree age of 16, 26 and 31 year old produced gum at 50.15 gr, 81.94 gr, and 9. l7 gr respectively per tree stand. Meanwhile productivity was also affected by tapping orientation, in which the east direcfion of tapping on 16­ year old pine tree at stimulant level of either 15% or 20% brought about the optimum productivity. Likewise, optimum production was obtained from 26­year old pine tree at 15% stimulant percentage with north­ as well as south­direction of tapping, and frorn the 31 year old pine free stands at 25% stimulant by west­direction tapping.
PENGARUH SUHU DAN WAKTU PEMASAKAN BIJI KEMIRI TERHADAP SIFAT MINYAKNYA Erra Yusnita; Bambang Wiyono; Dendi Setyawan
Jurnal Penelitian Hasil Hutan Vol 17, No 2 (1999): Buletin Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2804.599 KB) | DOI: 10.20886/jphh.1999.17.2.101-112

Abstract

Penelitian ini bertujuan untuk mempelajari pengaruh suhu dan waktu pemasakan biji kemiri terhadap sifat fisiko - kimia minyak kemiri, sehingga didapat kondisi pemasakan biji yang terbaik : Rancangan percobaan yang dipergunakan adalah Acak Lengkap Faktorial,yang terdiri dari dua faktor, yaitu suhu pemasakan (A) dan waktu pemasakan (B). Faktor A dalam 3 taraf yaitu 950C, 1050C, 1150C, sedangkan faktor B dalam 4 taraf yaitu 20, 30, 40, 50 menit.Hasil analisis keragaman menunjukkan bahwa suhu dan waktu pemasakan tidak memberikan pengaruh yang nyata terhadap rendemen, bobot jenis, indeks bias dan bilangan peroksida minyak kemiri. Waktu pemasakan  berpengaruh nyata pada viskositas dan kadar asam lemak bebas, tetapi berpengaruh  sangat  nyata  pada bilangan iod. Juga didapatkan bahwa suhu dan waktu pemasakan, serta interaksi kedua faktor  berpengaruh sangat nyata pada bilangan penyabunan minyak kemiri. Interaksi kedua faktor hanya berpengaruh terhadap kejemihan  (transmisi).Hasil menunjukkan bahwa  rendemen minyak  kemiri yang tinggi dengan sifat fisiko  kimia yang baik diperoleh dari kombinasi suhu 950C dan waktu pemasakan 30 menit, yaitu 52,72 %, dengan sifat fisiko kimia yang dapat bersaing dengan minyak biji rami yaitu : bobot  jenis 0,9268,  indeks bias 1,4739, viskositas 50,37 cp, transmisi 79,30 %, kadar asam  lemak bebas 1,6380%, bilangan iod 158,75, bilangan peroksida  1,1572 mg 02 per 100 gr, dan bilangan penyabunan 191.12.      Altematif  lain kombinasi suhu dan waktu pemasakan adalah pada suhu 105°C dan waktupemasakan 20 menit.
PENGARUH DIAMETER POHON, UMUR DAN KADAR STIMULAN TERHADAP PRODUKTIVITAS GETAH R Sudradjat; Dendi Setyawan; S Sumadiwangsa
Jurnal Penelitian Hasil Hutan Vol 20, No 2 (2002): Buletin Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.2002.20.2.143-158

Abstract

This report revealed the results of assesing the effect of diameter of pine trees, ages and dosages of stimulants (i.e. socepas agent). and harvesting period on the productivity of their exudates. The growing sites of the harvested pine trees were situated at three different blocks (i.e. I, II. and III). These blocks could represent the ages of the standing pine trees (i.e. 15. 18. 24 years old). Ages of trees in block III were the oldest, followed by that of blocks I and II, as consecutively, the youngest and second youngest. The three blocks further were each divided administratively into their own regional areas, called a stripes.For block I. the averages of exudate production varies in the range of 44.63 - 120.25 gram/ tree/period. Different dosages of socepas agent effected significantly the exudates productivity, i.e. the highest at 15 percent socepas agent (i.e. 80.08 gram/tree/period),followed in decreasing order at 20 percent socepas agent (76. 76 gram/tree/period). and at 10 percent socepas agent (61. 79 gram/tree/period). and finally at zero percent stimulant or control (47.81 gram/tree/period). Different harvesting periods. however. did not affect the exudates productivity significantly. Conversely, the diameter of pine trees affected significantly the productivity with a positive linear trend. This trend applied to whatever stripes in which the harvested trees were situated.For block II, harvesting period brought about significant effect on productivity where the highest was obtained at the second period (62.89 gram/tree). followed by decreasing order at the third period (56.31 gram/tree). and at the first period (47. 71 gram/tree), respectively. The variation of exudate productivity was around 39.21 - 81.97 gram/tree/period. This productivity was significantly affected by dosages of socepas. where the highest was at 20 percent dosage (68.08 gram/tree/period). followed at 10 percent (54. 04 gram/tree/period).at 15 percent (52.15 gram/tree/period), and finally at zero percent stimulant or control (48.35 gram/tree/period).Similar in block I. there was positive linear trend between tree diameter and exudates productivity of the pine trees, regardless of their locations in stripes.For block III. harvesting periods also affected the productivity, where the highest was from the third period (50. 71 gram/tree), subsequently from second (49.89 gram/tree). and at last from the first period (43.56 gram/tree). The productivity indicated some variation in the range of 36.06 - 68.34 gram/tree/period.Socepas stimulant affected significantly the exudates production. i.e. the highest at 20 percent socepas (54. 71 gram/tree/period). followed consecutively at 15 percent socepas (51.05 gram/tree/period). at 10 percent (44.28 gram/tree/period). and ultimately at zero percent socepas (42.17 gram/tree/ period). Similar also in blocks I and II. positive linear trend occurred between exudates production and diameters of trees, despite being in different stripes.Ages of the pine trees. as represented by the different blocks, affected production. in that the older the ages the lower the exudates productivity. The average productivities from the trees in block I (as the youngest i.e. 15 years old) and in block II (as the second youngest i.e. 18 years old) were 71.46 gram/tree and 46.07 gram/tree, respectively. Meanwhile, the productivity from block III (as the oldest i.e. 24 years old) was 41.17 gram/tree.
PENGARUH KADAR STIMULAN TERHADAP PRODUKTIVITAS GET AH PO HON PINUS (Pin us merkussi Jungh. et de Vriese) PADA BERBAGAI TINGKAT UMUR DI DAERAH SUMEDANG, JAWA BARAT Erra Yusnita; S Sumadiwangsa; Dendi Setyawan; Erik Dahlian
Jurnal Penelitian Hasil Hutan Vol 19, No 3 (2001): Buletin Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.2001.19.3.165-174

Abstract

Pine (Pinus merkusii Jungh et.de. Vriese) trees have an important role on related industries endeavoring in forest products, due to the widespread utlilization on their potential wood as well as gum matters.Production of pine gum can be affected by the manner of its tapping, kind and percentage of stimulant agent, age and diameter of trees. and genotype factors. Related as such, this investigation was intended lo evaluate the effect of pine tree diameters and stimulant percentage on productivity of pine tapping. In addition, this investigation was also to evaluate whether the tapping orientations (i.e. north­. east­, south­, and west­directions) affected the gum productivity. The main aim was to find out which tapping manner turned out to be the most efficient, the most economic and the safest either lo the trees or to the tapping worker themselves and end up with the optimum and continuity of pine gum production. The pine trees selected for this investigation were the ones growing in Sumedang region, West Java (Indonesia).Results revealed that age of pine trees significantly affecfed the gum production. Tree age of 16, 26 and 31 year old produced gum at 50.15 gr, 81.94 gr, and 9. l7 gr respectively per tree stand. Meanwhile productivity was also affected by tapping orientation, in which the east direcfion of tapping on 16­ year old pine tree at stimulant level of either 15% or 20% brought about the optimum productivity. Likewise, optimum production was obtained from 26­year old pine tree at 15% stimulant percentage with north­ as well as south­direction of tapping, and frorn the 31 year old pine free stands at 25% stimulant by west­direction tapping.
PENGARUH SUHU DAN WAKTU PEMASAKAN BIJI KEMIRI TERHADAP SIFAT MINYAKNYA Erra Yusnita; Bambang Wiyono; Dendi Setyawan
Jurnal Penelitian Hasil Hutan Vol 17, No 2 (1999): Buletin Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1999.17.2.101-112

Abstract

Penelitian ini bertujuan untuk mempelajari pengaruh suhu dan waktu pemasakan biji kemiri terhadap sifat fisiko - kimia minyak kemiri, sehingga didapat kondisi pemasakan biji yang terbaik : Rancangan percobaan yang dipergunakan adalah Acak Lengkap Faktorial,yang terdiri dari dua faktor, yaitu suhu pemasakan (A) dan waktu pemasakan (B). Faktor A dalam 3 taraf yaitu 950C, 1050C, 1150C, sedangkan faktor B dalam 4 taraf yaitu 20, 30, 40, 50 menit.Hasil analisis keragaman menunjukkan bahwa suhu dan waktu pemasakan tidak memberikan pengaruh yang nyata terhadap rendemen, bobot jenis, indeks bias dan bilangan peroksida minyak kemiri. Waktu pemasakan  berpengaruh nyata pada viskositas dan kadar asam lemak bebas, tetapi berpengaruh  sangat  nyata  pada bilangan iod. Juga didapatkan bahwa suhu dan waktu pemasakan, serta interaksi kedua faktor  berpengaruh sangat nyata pada bilangan penyabunan minyak kemiri. Interaksi kedua faktor hanya berpengaruh terhadap kejemihan  (transmisi).Hasil menunjukkan bahwa  rendemen minyak  kemiri yang tinggi dengan sifat fisiko  kimia yang baik diperoleh dari kombinasi suhu 950C dan waktu pemasakan 30 menit, yaitu 52,72 %, dengan sifat fisiko kimia yang dapat bersaing dengan minyak biji rami yaitu : bobot  jenis 0,9268,  indeks bias 1,4739, viskositas 50,37 cp, transmisi 79,30 %, kadar asam  lemak bebas 1,6380%, bilangan iod 158,75, bilangan peroksida  1,1572 mg 02 per 100 gr, dan bilangan penyabunan 191.12.      Altematif  lain kombinasi suhu dan waktu pemasakan adalah pada suhu 105°C dan waktupemasakan 20 menit.
Co-Authors Bambang Wiyono Erik Dahlian Erra Yusnita R Sudradjat S Sumadiwangsa