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INDONESIA
Indonesian Journal of Agricultural Science
Published by Kementerian Pertanian
ISSN : 1411982X     EISSN : 23548509     DOI : -
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
The journal publishes primary research articles from any source if they make a significant original contribution to the experimental or theoretical understanding of some aspect of agricultural science in Indonesia. The definition of agricultural science is kept as wide as possible to allow the broadest coverage in the journal. Accredited base on Director Decree of Indonesian Institute of Science No. 816/D/2009 with acreditation No. 172/AU1/P2MBI/08/2009. IJAS is newly accredited by the Indonesian Institute of Science in 2012 (No. 473/AU2/P2MI-LIPI/08/2012) for period of 2012-2015.
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Articles 8 Documents
 1 
Search results for , issue "Vol 3, No 2 (2002): October 2002" : 8 Documents clear
REPRODUCTIVE BIOLOGY OF FIVE SPECIES OF ANCHOVIES (ENGRAULIDAE) FROM BIMA BAY, SUMBAWA, NUSA TENGGARA Andamari, Retno; Milton, David; Zubaidi, Thohir
Indonesian Journal of Agricultural Science Vol 3, No 2 (2002): October 2002
Publisher : Indonesian Agency for Agricultural Research and Development - MOA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The reproductive biology of five species of anchovies (Encrasicholina and Stolephorus) in Bima Bay, Nusa Tenggara, Indonesia was examined and  compared with previous studies of the same species in Bacan, Maluku and other parts of Indonesia. Fish and plankton sampling was conducted in February and April 2000. The length and weight relationship of five species of anchovies had a slope (b) that ranged from 2.71 to 3.74. These values were less than those found in Bacan for the same species. All species were multiple spawner and the mean batch fecundity ranged between 1226 (Encrasicholina devisi) and 2470 (E. punctifer). Relative fecundity varied among the species inversely with size, being lower in the larger species. Age at first spawning varied from 67 to 141 days for all five species and was higher in Stolephorus species. Lifetime egg production was less than that found in Bacan for the same species, but similar to that found in similar habitats elsewhere in the tropical Indo-Pacific. These results suggest that anchovy egg production is higher, but more variable in open oceanic environments compared with the more stable, coastal bays.
COMMUNICATION APPROACH FOR AGRICULTURAL TECHNOLOGY TRANSFER IN VARIOUS AGRO-ECOSYSTEM ZONES: A Case Study in South Sumatra Province Sulaiman, Fawzia
Indonesian Journal of Agricultural Science Vol 3, No 2 (2002): October 2002
Publisher : Indonesian Agency for Agricultural Research and Development - MOA

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Abstract

An effective communication and dissemination of research results should be based on the natural resource endowment in each agro-ecosystem and the socio-economic background of the prospective clientele. The objective of this study was to examine several forms of communication approaches for disseminating agricultural technology and information. This study was based on a baseline survey conducted in four agroecosystems of South Sumatra Province, i.e. tidal swamp, swamp, dry lowland, and irrigated lowland. Results indicated that the social economic condition and natural resource endowment of farmers in the swamp agro-ecosystem zone (AEZ) of Ogan Komering Ilir is suitable for fishery development instead of food crop agribusiness. However, farmers in the swamp AEZ need technologies that reduce their workload in land cultivation and weeding activities. Further, as field extension workers (FEWs) were considered as the source of agricultural information by most farmers, the involvement of FEWs in agricultural research and technology assessment will increase the effectiveness of the innovation transfer, especially in the tidal swamp and irrigated lowland AEZs. In the four AEZs, the FEWs and farmer group leader can be used as an effective channel to convey agricultural technology and information in South Sumatra Province.
COLORIMETRIC MEASUREMENTS OF COCOA BEANS (Theobroma cacao) Meulemans, Charles C.E.; T., Untung Surapati; Tjatjo, Ardin
Indonesian Journal of Agricultural Science Vol 3, No 2 (2002): October 2002
Publisher : Indonesian Agency for Agricultural Research and Development - MOA

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Abstract

A series of studies have been carried out to develop a simple, easy to use, and affordable device to measure the colour of cocoa beans. The present paper reports the development of the device based on colorimetric principles. An electronic device which enables cocoa smallholders to give an objective “onefigure” indication of the quality of their cocoa beans was described. A sensor was constructed which contained a red light emitting diode (LED) illuminating the target and a silicon photodiode detecting the reflected light. Because of the considerable difference in colour between dried unfermented and fermented cocoa beans, the differences in diffuse reflection of red light (660 nm) could be about 20 and very easy to measure. The method was checked with a spectrophotometer in the fixed mode at 660 nm, which revealed a high correlation coefficient. The sensor was combined with a microprocessor controlled electronic device for fast measurement of cocoa beans without any calculations which automatically counts the number of measured beans and gives the resulting average reflection value.
LACK OF EFFECT OF PRETREATMENT ON THE VIABILITY OF MACADAMIA (Macadamia integrifolia) SEED Hasanah, Maharani; ., Sukarman; ., Sukarman; Rusmin, Devi; Rusmin, Devi
Indonesian Journal of Agricultural Science Vol 3, No 2 (2002): October 2002
Publisher : Indonesian Agency for Agricultural Research and Development - MOA

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Abstract

One problem in developing macadamia in Indonesia is the limited availability of good quality seed. Viability of the seed is easily lost and erratic, and the seed has long dormancy periods. The objective of the study was to find a method for enhancing germination percentage of macadamia seed. The study evaluated different pretreatments of macadamia seeds before planting. The pretreatments were period of fermentation, i.e., 0, 1, 2, 3, 4, 5, 6, and 7 daysone day each soakingdrying-soakingone day each drying-soaking-dryingand alternate drying-soaking until the seeds were cracked. The treatments were arranged in completely randomized design. Results showed that no treatment significantly affected percentage of seed germination, index of speed of germination, number of leaves, and dehydrogenase enzyme activity, but treatments significantly affected seedling height and electric conductivity of seed leakage solution. Seed germination percentage ranged from 66.67 to 86.67.
LACK OF EFFECT OF PRETREATMENT ON THE VIABILITY OF MACADAMIA (Macadamia integrifolia) SEED Maharani Hasanah; Sukarman Sukarman; Devi Rusmin
Indonesian Journal of Agricultural Science Vol 3, No 2 (2002): October 2002
Publisher : Indonesian Agency for Agricultural Research and Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/ijas.v3n2.2002.p58-61

Abstract

One problem in developing macadamia in Indonesia is the limited availability of good quality seed. Viability of the seed is easily lost and erratic, and the seed has long dormancy periods. The objective of the study was to find a method for enhancing germination percentage of macadamia seed. The study evaluated different pretreatments of macadamia seeds before planting. The pretreatments were period of fermentation, i.e., 0, 1, 2, 3, 4, 5, 6, and 7 daysone day each soakingdrying-soakingone day each drying-soaking-dryingand alternate drying-soaking until the seeds were cracked. The treatments were arranged in completely randomized design. Results showed that no treatment significantly affected percentage of seed germination, index of speed of germination, number of leaves, and dehydrogenase enzyme activity, but treatments significantly affected seedling height and electric conductivity of seed leakage solution. Seed germination percentage ranged from 66.67 to 86.67.
REPRODUCTIVE BIOLOGY OF FIVE SPECIES OF ANCHOVIES (ENGRAULIDAE) FROM BIMA BAY, SUMBAWA, NUSA TENGGARA Retno Andamari; David Milton; Thohir Zubaidi
Indonesian Journal of Agricultural Science Vol 3, No 2 (2002): October 2002
Publisher : Indonesian Agency for Agricultural Research and Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/ijas.v3n2.2002.p37-42

Abstract

The reproductive biology of five species of anchovies (Encrasicholina and Stolephorus) in Bima Bay, Nusa Tenggara, Indonesia was examined and  compared with previous studies of the same species in Bacan, Maluku and other parts of Indonesia. Fish and plankton sampling was conducted in February and April 2000. The length and weight relationship of five species of anchovies had a slope (b) that ranged from 2.71 to 3.74. These values were less than those found in Bacan for the same species. All species were multiple spawner and the mean batch fecundity ranged between 1226 (Encrasicholina devisi) and 2470 (E. punctifer). Relative fecundity varied among the species inversely with size, being lower in the larger species. Age at first spawning varied from 67 to 141 days for all five species and was higher in Stolephorus species. Lifetime egg production was less than that found in Bacan for the same species, but similar to that found in similar habitats elsewhere in the tropical Indo-Pacific. These results suggest that anchovy egg production is higher, but more variable in open oceanic environments compared with the more stable, coastal bays.
COMMUNICATION APPROACH FOR AGRICULTURAL TECHNOLOGY TRANSFER IN VARIOUS AGRO-ECOSYSTEM ZONES: A Case Study in South Sumatra Province Fawzia Sulaiman
Indonesian Journal of Agricultural Science Vol 3, No 2 (2002): October 2002
Publisher : Indonesian Agency for Agricultural Research and Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/ijas.v3n2.2002.p43-51

Abstract

An effective communication and dissemination of research results should be based on the natural resource endowment in each agro-ecosystem and the socio-economic background of the prospective clientele. The objective of this study was to examine several forms of communication approaches for disseminating agricultural technology and information. This study was based on a baseline survey conducted in four agroecosystems of South Sumatra Province, i.e. tidal swamp, swamp, dry lowland, and irrigated lowland. Results indicated that the social economic condition and natural resource endowment of farmers in the swamp agro-ecosystem zone (AEZ) of Ogan Komering Ilir is suitable for fishery development instead of food crop agribusiness. However, farmers in the swamp AEZ need technologies that reduce their workload in land cultivation and weeding activities. Further, as field extension workers (FEWs) were considered as the source of agricultural information by most farmers, the involvement of FEWs in agricultural research and technology assessment will increase the effectiveness of the innovation transfer, especially in the tidal swamp and irrigated lowland AEZs. In the four AEZs, the FEWs and farmer group leader can be used as an effective channel to convey agricultural technology and information in South Sumatra Province.
COLORIMETRIC MEASUREMENTS OF COCOA BEANS (Theobroma cacao) Charles C.E. Meulemans; Untung Surapati T.; Ardin Tjatjo
Indonesian Journal of Agricultural Science Vol 3, No 2 (2002): October 2002
Publisher : Indonesian Agency for Agricultural Research and Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/ijas.v3n2.2002.p52-57

Abstract

A series of studies have been carried out to develop a simple, easy to use, and affordable device to measure the colour of cocoa beans. The present paper reports the development of the device based on colorimetric principles. An electronic device which enables cocoa smallholders to give an objective “onefigure” indication of the quality of their cocoa beans was described. A sensor was constructed which contained a red light emitting diode (LED) illuminating the target and a silicon photodiode detecting the reflected light. Because of the considerable difference in colour between dried unfermented and fermented cocoa beans, the differences in diffuse reflection of red light (660 nm) could be about 20 and very easy to measure. The method was checked with a spectrophotometer in the fixed mode at 660 nm, which revealed a high correlation coefficient. The sensor was combined with a microprocessor controlled electronic device for fast measurement of cocoa beans without any calculations which automatically counts the number of measured beans and gives the resulting average reflection value.

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