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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.
Arjuna Subject : -
Articles 4 Documents
 1 
Search results for , issue "Vol 1, No 1 (2000): April 2000" : 4 Documents clear
PRELIMINARY ECOLOGOCAL STUDY OF Rhizobium : SELECTION OF ANTIBIOTIC RESISTANT MUTANTS OF Rhizobium PMA295 NODULATING Sesbania sesban Nurhayati D. Purwantari
Indonesian Journal of Agricultural Science Vol 1, No 1 (2000): April 2000
Publisher : Indonesian Agency for Agricultural Research and Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/ijas.v1n1.2000.p16-20

Abstract

This study was designed to provide strain for studying the ecology of Rhizobium when it was used to inoculate seed sown in the soil or in the field. Naturally occurring antibiotic resistant mutant strains of Rhizobium PMA295 nodulating Sesbania sesban were selected by antibiotic selection method. The isolates should be as effective  in nitrogen fixation as the parental  wild-type strain. Authentication of mutant isolates showed that these rifampicin mutant isolates could nodulate test plant and most nodules formed by the rifampicin 50 ppm and streptomycin 500 ppm mutant isolates were red in colour. These twenty isolates can be regarded as rhizobia. The most effective mutant, isolates PMA295 selected on rifampicin 50 ppm was also resistant to rifampicin 60, 70, 80, and 90 ppm. The effectiveness of most mutant strains was not significantly different from their parent strains. The rifampicin 50 ppm mutant strain of Rhizobium PMA295 could be used as inoculant for ecological study.
QUALITY CHANGES OF SARDINES (Sardinella neopilchardus) AT INDONESIAN AMBIENT TEMPERATURE Farida Ariyani
Indonesian Journal of Agricultural Science Vol 1, No 1 (2000): April 2000
Publisher : Indonesian Agency for Agricultural Research and Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/ijas.v1n1.2000.p21-28

Abstract

In tropical countries such as Indonesia, high ambient temperature and a lack of icing cause very rapid spoilage of fish. Leaving fish uniced while waiting for processing is a common practice resulting in lower quality of the end products, and consequently lower price of the products. To study the spoilage pattern of sardines (Sardinella neophilchardus) in a tropical region, and to investigate a simple and quick method to judge the degree of spoilage, observations on the deterioration of sardines were carried out by incubating fish in a humidity chamber adjusted to 28-30oC. RH 70-80% for up to 14 h. The changes of sensory attributes based on demerit point score. pH, and total volatile base nitrogen (TVB-N) were monitored to determine the degree of spoilage. Although the appearance of sardines was still bright after 6-h incubation time, fish were not as fresh as those without incubation and the belly and tissue were softened. After incubation time of 10 h, fish showed slight to moderate signs of spoilage with demerit point score of 25 out of the maximum score of 39, and a TVB-N content of 20 mg%N. This is similar to the fish quality commonly used in the commercial production of dried-salted fish in Indonesia. Fish incubated for 12 h or more appeared completely spoiled and were rejected by sensory panel. A high correlation between demerit point score and TVB-N was noted, therefore the demerit point system which was more suitable, quicker, and easier could be used to determine the degree of fish spoilage.
SOIL OF PAMETIKARATA, EAST SUMBA: ITS SUITABILITY AND CONSTRAINTS FOR FOOD CROP DEVELOPMENT B. H. Prasetyo; Hendri Sosiawan; Sofyan Ritung
Indonesian Journal of Agricultural Science Vol 1, No 1 (2000): April 2000
Publisher : Indonesian Agency for Agricultural Research and Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/ijas.v1n1.2000.p1-9

Abstract

Pametikarata, Lewa subdistrict, is the priority area for food crop development in East Sumba. To evaluate its suitability and constraints, chemical properties, suitability and fertility capability classification for rice and secondary crops of some potential soils have been studied both in the field and in the laboratory. Seven soil profiles consisted of forty one soil samples were subjected to chemical and mineralogical analyses in the laboratory. The analyses consisted of clay fraction and organic-carbon contents, pH, potential P and K (25% HCI extraction), available P, phosphate retention. Exchangeable cations and cation exchange capacity (NH4OAc 1N, pH 7), and mineralogical composition of the clay fraction. The results indicate that soil acidity varies from acid to neutral Exchangeable cations are dominated by Ca cation and soil CEC ranges from low to very high. Clay mineral composition also varies, some are dominated by montmorillonite, others show mixed mineralogy between montmorillonite and kaolinite, and the rests are dominated by kaolinite with the exception of wet Vertisols, all soils are grouped as marginally suitable (S3) for rice and secondary crops. Nutrient availability and retention are the common limiting factors. Using fertility capability classification (FCC), all soils are grouped as clayey soils with low infiltration and high water holding capacity. The serious constraint for food crop development in this area is uncontrolled grazing that makes a conflict of interests between farming and cattle herding systems. Optimum success of food crop development in the area could be reached by controlling the herding system and improving the existing agricultural system.
IDENTIFICATION AND PATHOGENICITY OF ISOLATE OF BACTERIUM CAUSED LEAF BLIGHT DISEASE ON Maranta arundinacea Supriadi Supriadi; Nildar Ibrahim; N. Karyani
Indonesian Journal of Agricultural Science Vol 1, No 1 (2000): April 2000
Publisher : Indonesian Agency for Agricultural Research and Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/ijas.v1n1.2000.p10-15

Abstract

Arrowroot (Maranta arundinacea L) is a multi-functional plant used as a source of medicinal, carbohydrate (especially the green leaf type) and also as ornamental plant (the streaked white leaf type). A leaf blight disease is recently found on the streaked white type in Bogor. Preliminary observation indicated that the disease was associated with bacterial infection. The cause of the disease has not been studied. This study was aimed to identify the cause of bacterial leaf blight disease. Experiments were conducted in the laboratory of Research Institute for Spice and Medicinal Crops in Bogor. Suspected bacteria were isolated from diseased leaves. The results showed that the bacterium produced white to brownish colonies on rich agar media containing peptone or cassamino acid. 3-5 mm in diameter, circular, and did not yield fluorescent pigment on King’s B medium. The bacterium formed rod cells, Gram negative, accumulated poly β hydroxybutyrate, utilized glucose under aerobic condition, not hydrolyse arginine and starch, positive catalase, insensitive to tetrazolium salt (0.1%), and grew at 35oC. The bacterium neither producted xanthomonadin pigment nor reduced nitrate to nitrite. The pathogen was tolerant to penicillin and oxolinic acid, but sensitive to streptomycin and oxytetracycline at high concentration (1.000 ppm). These characteristics met to those of Pseudomonas cepacia. Pathogenicity test on detached leaves showed that the typical symptom of blight was similar to that of natural infection on arrowroot. This is the first report on occurrence of P cepacia on arrowroot plant.

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