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Journal of Tropical Crop Science
Published by Institut Pertanian Bogor
ISSN : 23560169     EISSN : 23560177     DOI : -
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Journal of Tropical Crop Science is an international journal publishing research related to tropical crops. Articles in the journal focus on in-vivo and in-vitro production and production environment, breeding, seed technology, physiology, postharvest, pest and pathology of cereals, vegetables, fruits, ornamentals, medicinal and plantation crops; soil, landscape, turf and agro ecology management under tropical conditions.
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Articles 7 Documents
 1 
Search results for , issue "Vol 1 No 2 (2014): Journal of Tropical Crop Science" : 7 Documents clear
Influence of Manure, Nitrogen, Phosphorus and Potassium Fertilizer Application on Growth of One-year-old Oil Palms on Marginal Soil in Jonggol, Bogor, Indonesia Sudrajat, Sudradjat; Sukmawan, Yan; Sugiyanta, Sugiyanta
Journal of Tropical Crop Science Vol 1 No 2 (2014): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (156.651 KB) | DOI: 10.29244/jtcs.1.2.18-24

Abstract

The oil palms (Elaeis guineensis Jacq.) are highlyefcient oil producers. It produces ve to seven timesmore vegetable oil per hectare than soybean, sunower,and rapeseed. The objectives of this research were tostudy the role of organic and N, P, and K fertilizers ongrowth of one-year-old immature oil palm on marginalsoil in Jonggol. The research was conducted at IPBCargill Teaching Farm (ICTF) of Oil Palm, Jonggol,Bogor,West Java from March 2013 to March 2014. Theexperiment was arranged in a factorial experimentfollowing a randomized block design with threereplications. The rst factor was organic fertilizer(manure) consisting of 0 (O), 15 (O1) and 30 (O2) kg pertree per year. The second factor was inorganic fertilizerconsisting of 0 (S0); 0.25 kg N + 0.25 kg P O + 0.39 kg 2 5K O(S ) 0.50 k N+ 0.50 kg P O + 0.78 kg K O(S ) 2 25 2 1and g 2per tree. The results demonstrated that application ofmanure up to 30 kg per tree per year did not affect thegrowth of one-year-old oil palm. Application of 0.50 kg N+ 0.50 kg P O + 0.78 kg K O highest 2 5 2 per tree gave theresult in increasing frond production, stem girth, and leafnutrient concentration. The results of leaf analysis andplant growth responses suggested that the rates ofmanure and inorganic fertilizers applied in this study arenot sufcient to improve young oil palm growth inmarginal soil in Jonggol.Keywords: cow manure, critical nutrient level, inorganicfertilizer, soil fertility, vegetative growth
Description and Ecology of Indonesian Species Tetrastigma glabratum (Blume) Planch, a host of Rafflesiaceae Lianah, Lianah
Journal of Tropical Crop Science Vol 1 No 2 (2014): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (81.144 KB) | DOI: 10.29244/jtcs.1.2.1-3

Abstract

This article presents an overview of the currentknowledge of Tetrastigma glabratum (Blume) Planch, ahost of Rafesiaceae, by providing information onbotany and ecology of T. glabratum, and conservationstatus by propagating the plants vegetatively andmonitoring its growth in-situ and ex-situ. The study wasconducted in the protected rainforests at Mount Prau,Candiroto, North Kedu, Central Java between 2009-2014. Shoot growth and expansion in stem diameterwere faster in-situ than ex-situ whereas the number ofleaves was similar in both locations. Ex-situconservation and cultivation is very important to protectthese rare, unique, and endangered species fromextinction.
The Physiological Dormancy and Germination Responses of Brunonia australis and Rhodanthe floribunda to Gibberellic Acid Treatment Ha, Tuan Minh
Journal of Tropical Crop Science Vol 1 No 2 (2014): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (336.116 KB) | DOI: 10.29244/jtcs.1.2.30-34

Abstract

Brunonia australis (Goodeniaceae) and Rhodanthefloribunda (Asteraceae) are two potential Australiannative ower species desired by oricultural markets.However, the species are difcult to propagate. Thisstudy examined internal factors that constraint seedgermination, seed viability and physiological dormancy.The study was conducted during April to May 2009 at theGatton nursery, The University of Queensland GattonCampus to identify the underlying reasons for poorgermination and to provide recommendations forimproving propagation effectiveness. Seeds of B.australis collected in 2003 germinated readilyirrespective of germination media, whereas seedscollected in 2007 and 2008 with high proportion of viableseeds could only germinate with the presence of GA3(100 mg.L ) in germination media though with relatively -1low rates (8.75% and 10.00% respectively) of seedgermination. Seeds of R. floribunda collected in 2003showed a signicant improvement in germination inagar media supplemented with 100 mg.L GA (67.5%) -13 compared to control treatment (10.0%). The resultssuggest that physiological dormancy occurs in bothspecies. The use of GA is recommended for improving 3germination rates of the two species. Further studies onthe effects of different GA concentrations to improve 3seed germination should be conducted.Keywords: Dormancy, germination, gibberellic acid, TZ,viability.
The Potential of Flowering Weeds as Refugia for Predatory Insects at Bantimurung-Bulusaraung National Park, South Sulawesi Ngatimin, Sri Nur Aminah; Agus, Nurariaty; P. Saranga, Annie
Journal of Tropical Crop Science Vol 1 No 2 (2014): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (70.344 KB) | DOI: 10.29244/jtcs.1.2.25-29

Abstract

A study on identication of owering weeds as predatoryinsect alternative foods was conducted at Bantimurung-Bulusaraung National Park, South Sulawesi, Indonesiain February 2013. Among the plants that naturally growin the national park area Cassia siamea andClerodendron paniculatum, which were source of nectarfor insects, particularly butteries. Visits of predatoryinsect to owering weeds and species of both insectsand owering weeds were recorded. The preferredowering weeds visited by the predatory insects are C.striata (Papilionaceae), A.conyzoides (Asteraceae) andL. camara (Verbenaceae) followed by S. nodiflora(Asteraceae), S. rhombifolia (Malvaceae) and L.crustacea (Scrophulariaceae). A large number of adultsand pupae of Coccinella sp. was found in theBantimurung-Bulusaraung National Park.Keywords : nectar, pollen, alternative host, weeds,Indonesia
Effects of Plant Growth Promoting Rhizobacteria on Seed Germination Characteristics of Tomato and Lettuce Mangmang, Jonathan; Deaker, Rosalind; Rogers, Gordon
Journal of Tropical Crop Science Vol 1 No 2 (2014): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (96.623 KB) | DOI: 10.29244/jtcs.1.2.35-40

Abstract

Plant growth promoting rhizobacteria (PGPR) represent a wide genera of rhizospheric bacteria which, when introduced in association with the host plant in proper amount, can enhance plant growth and productivity. A series of experiments were conducted to determine the germination responses of tomato and lettuce to PGPR inoculation. Seeds were inoculated with different strains of Azospirillum brasilense Sp7, Sp7-S and Sp245, Herbaspirillum seropedicea and Burkholderia phytofirmans PsJNT. The results reveal that Sp7-S inoculation yielded better germination rate and total germination of tomato. PGPR inoculation, except Sp7, produced longer (28%) and heavier (37%) roots with superior vigor. In lettuce, PGPR strains, except B. phytofirmans PsJNT, and Sp7 and B. phytofirmans PsJNT, enhanced germination vigor and length of roots (26%), respectively. The results provide further evidence concerning their importance as PGPR and indicate the potential of exploiting some of these PGPR to improve seedling emergence and establishment of vegetables.
The Usefulness of Molecular Markers Approach for Developing Heterotic Groups in Maize Suwarno, Willy B
Journal of Tropical Crop Science Vol 1 No 2 (2014): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (75.273 KB) | DOI: 10.29244/jtcs.1.2.4-10

Abstract

The phenomenon of heterosis provides a greatopportunity for plant breeders to gain greaterperformance and yield in the hybrids compared to theirinbred line parents. In most cross-pollinated crops likemaize, heterosis plays an important role as theperformance of the hybrids is of a great value. Heterosisgain much interest until recently and current studies stillattempt to elucidateone of these is utilizing molecularmarkers to estimate genetic distances among inbredlines followed by developing putative groups. In a welldened heterotic group, between-groups mating areexpected to produce better hybrids than within-groupsmating. Some studies of marker-aided heterotic groupdevelopment resulted in functional heterotic groups;while some other reported that the groups failed toprovide evidence of heterosis in the hybrids.Considering the prediction of hybrids' performance willdepend on genetic background of inbred lines, andmarkers technology are continuously improved, there isstill a good opportunity to obtain useful heterotic groupsfor a particular breeding population.Keywords: maize breeding, genetic distance, heterosis,molecular markers.
Reproductive success and compatibility among accessions of Jatropha curcas in Indonesia Palupi, Endah R.; Ahmad, Ade S.; Affandi, Rofiq; Qadir, Abdul; Randriani, Eni
Journal of Tropical Crop Science Vol 1 No 2 (2014): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (95.29 KB) | DOI: 10.29244/jtcs.1.2.11-17

Abstract

Large scale exploitation of Jatropha curcas for biofuelproduction is restrained by low productivity henceeconomically not protable. One of the main constraintsis due to limited number of female owers in aninorescence which eventually develop into fruits thatbear seed. Investigation on oral biology andreproductive potential of the species had been carriedout, but seems to vary among sites. The research wasconducted to study reproductive success and thecompatibility among Indonesian Jatropha accessions.The research was set up in two experiments. The rstexperiment was conducted at the Jatropha seedorchard, Pakuwon, Sukabumi, West Java from April toJuly 2007 using four-year- old trees of accessions fromLampung, Banten, West Java, and Central Java. Thesecond experiment was conducted at LeuwikopoExperimental Station of Bogor Agricultural Universityfrom April to July 2008 using one-year-old trees ofaccessions from Lampung, Bengkulu, Palembang, andKediri. Flowers were obtained from controlled self andcross-pollinated as well as left for open-pollination. Theresult showed that reproductive success varied amongaccessions; the greatest success was 0.73 obtainedfrom aWest Java accession and the least was 0.53 fromBanten accession. The Jatropha accessions werecategorized as partially self-incompatible as indicatedby index of self-incompatibility (ISI) that ranged 0.93-0.99. Banten accession produced highly viable andvigorous seeds regardless of pollination methods;accessions of Central Java produced higher viabilityseeds when cross-pollinated within accession, whereasthose from West Java and Lampung produced higherviability seeds when self-pollinated.Keywords: accessions, Jatropha curcas, selfpollination,self-incompatibility, seedviability

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