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BIOTROPIA - The Southeast Asian Journal of Tropical Biology
Published by Southeast Asian Regional Centre for Tropical Biology
ISSN : 02156334     EISSN : 1907770X     DOI : http://dx.doi.org/10.11598/btb
Core Subject : Health, Science, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Veterinary
BIOTROPIA, The Southeast Asian Journal of Tropical Biology, is a scientific publication of the Southeast Asian Ministers of Education Organization (SEAMEO) – Southeast Asian Regional Center for Tropical Biology (BIOTROP). It publishes articles in the broad areas of tropical ecosystems and environmental impacts, biodiversity conservation and sustainable development and biotechnology.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 6 Documents
 1 
Search results for , issue "No. 2 (1989)" : 6 Documents clear
THE PERFORMANCE OF SOYBEAN (c.v. Americana) ESTABLISHED BY ZERO TILLAGE TECHNIQUE IN IMPERATA FIELD CONTROLLED BY HERBICIDES TJITROSEMITO, SOEKISMAN
BIOTROPIA No. 2 (1989)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (135.519 KB) | DOI: 10.11598/btb.1989.0.2.92

Abstract

A  field  experiment  was  conducted  to  investigate  the performance  of  soybean  (c.v.  Americana)  when established with zero tillage technique on Imperata dominated area. Four different techniques of alang-alang control  i.e.  imazapyr  (20  kg  ai/ha),  glyphosate  (25  kg  ai/ha),  glufosinate  (3.0  kg  ai/ha)  and  manual cultivation were arranged factorially with time of plantings i.e. 1,2 and 3 months after treatments. The  alang-alang  damages  varied  with  herbicides  and  times,  imazapyr  (20  kg  ai/ha) showed slow appearance of damage at 3 months after application it was only 69%, while that of glufosinate was already down to 48% due to regrowth. No phytotoxicity was recorded, but the yield was low.
THE DISTRIBUTION AND POTENTIAL PROBLEMS OF MIMOSA PIGRA L. IN INDONESIA TJITROSOEDIRDJO, SRI S.
BIOTROPIA No. 2 (1989)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (352.13 KB) | DOI: 10.11598/btb.1989.0.2.93

Abstract

Mimosa pigra L. (Mimosa asperata L.) of the family Mimosaceae is an introduced species from South America which is locally naturalized in Indonesia. The present known distribution sites are still restricted to Java, Sumatra, and Kalimantan. It is found in almost all provinces of Java and many heavily infested areas have been noted in Jakarta and West Java. The introduction of the plant to other islands has not been reported yet. The separation of the islands by sea is preventing the further spread of the plant in Indonesia. Control is basically occasional and on an individual basis. There is no sustained effort yet to control the plant. The urgency of controlling and restricting its spread cannot be over emphasized.
FRUIT PRODUCTION OF A SIX-YEAR OLD SHOREA STENOPTERA PLANTATION AT HAURBENTES, BOGOR, INDONESIA SUZUKI, EIZI
BIOTROPIA No. 2 (1989)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (180.196 KB) | DOI: 10.11598/btb.1989.0.2.90

Abstract

A  six-year  old  plantation  of  Shorea  stenoptera  at Haurbentes,  Bogor  flowered  for  the  first  time  on October, 1987. In plots of 270 m2, 12 of the 32 trees had opened flowers. The average heights of flowering and non-flowering trees were 400 cm and 270 cm, respectively. The flowers and fruits were counted four times from October 28, 1987 until February 17, 1988. In October, a total of 24313 flowers existed and 1.9% of them became mature fruits on February, 1988. The fruit production was 308 kg/ha and 133 kg/ha in fresh and dry weights, respectively.
REMOVAL AND LEACHING OF NUTRIENTS BY SALVIN1A MOLESTA MITCHEL AND EICHHORNIA CRASSIPES (MART.) SOLMS WEE, Y.C.
BIOTROPIA No. 2 (1989)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (292.737 KB) | DOI: 10.11598/btb.1989.0.2.95

Abstract

Profuse growth of Eichhornia crassipes and Salvinia molesta in Singapore reservoirs required their regular manual removal as their prolonged presence can lead to deterioration in the quality of the potable water. Clearing of the reservoir catchments, together with regular removal of the weeds and dumping them away from the catchments, should, in the long term, reduce their presence in the reservoirs. Laboratory experiments showing the removal of chloride, sulphate, phosphorus and nitrate from the growing medium and the release of chloride, phosphorus and nitrate by rotting plants should convince the administrators of the benefit of proper management of the problem.
CRITICAL PERIOD OF MUNGBEAN (PHASEOLUS RADIATUS L.) TO WEED COMPETITION UTOMO, I.H.
BIOTROPIA No. 2 (1989)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (228.537 KB) | DOI: 10.11598/btb.1989.0.2.91

Abstract

A  field  experiment was  conducted  to  study  the  critical  period  of weed  control  on  the  crop  of mungbean (Phaseolus radiatus L.). The studies were done in the field of BIOTROP Experimental Station with  the  natural  existing weed  population.  It was  found  that  the  critical  period  of mungbean  to weed competition was from 3-6 weeks after planting.
A COLLECTION OF TICKS (IXODIDAE) FROM SULAWESI UTARA, INDONESIA DURDEN, L.A.
BIOTROPIA No. 2 (1989)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.1989.0.2.94

Abstract

Ixodid  ticks  were  collected  from  seven  species  of  endemic  murid  rodents  and  from  vegetation  in Sulawesi Utara,  Indonesia. Adult  ticks belonging  to  the species, Amblyomma babirussae, A. cyprium and Dermacentor  (Indocentor) steini were taken  from  the vegetation.  Immature  ticks assignable  to the genera, Haemaphysalis,  Amblyomma  and  Ixodes  infested  the murids with  Parauromys dominator and Maxomys musschenbroekii being  the  two most heavily  tick-infested host species. The data are  compared  to other  tick records from Sulawesi.

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