Indonesian Plantation Research Articles

How Rainforest Conversion to Agricultural Systems in Sumatra (Indonesia) Affects Active Soil Bacterial Communities.

Palm oil production in Indonesia increased constantly over the last decades, which led to massive deforestation, especially on Sumatra island. The ongoing conversion of rainforest to agricultural systems results in high biodiversity loss. Here, we present the first RNA-based study on the effects of rainforest transformation to rubber and oil palm plantations in Indonesia for the active soil bacterial communities. For this purpose, bacterial communities of three different converted systems (jungle rubber, rubber plantation, and oil palm plantation) were studied in two landscapes with rainforest as reference by RT-PCR amplicon-based analysis of 16S rRNA gene transcripts. Active soil bacterial communities were dominated by Frankiales (Actinobacteria), subgroup 2 of the Acidobacteria and Alphaproteobacteria (mainly Rhizobiales and Rhodospirillales). Community composition differed significantly between the converted land use systems and rainforest reference sites. Alphaproteobacteria decreased significantly in oil palm samples compared to rainforest samples. In contrast, relative abundances of taxa within the Acidobacteria increased. Most important abiotic drivers for shaping soil bacterial communities were pH, calcium concentration, base saturation and C:N ratio. Indicator species analysis showed distinct association patterns for the analyzed land use systems. Nitrogen-fixing taxa including members of Rhizobiales and Rhodospirillales were associated with rainforest soils while nitrifiers and heat-resistant taxa including members of Actinobacteria were associated with oil palm soils. Predicted metabolic profiles revealed that the relative abundances of genes associated with fixation of nitrogen significantly decreased in plantation soils. Furthermore, predicted gene abundances regarding motility, competition or gene transfer ability indicated rainforest conversion-induced changes as well.

Understory Bird Community of An Oil Palm Plantation in Central Kalimantan

The implementation of High Conservation Value (HCV) area in oil palm plantation in Indonesia has caused the occurrence of remnant natural areas within oil palm landscape. Such forest remnants increase habitat heterogeneity that is important to maintain biodiversity in oil palm plantation including birds. Understory birds are the most prone to habitat degradation compared to other bird group species. This study aims at examining understory bird community in an oil palm plantation with different distance from HCV area. Mist nets were set up in June 2014 and January/February 2015 in areas adjacent to HCV area and 1 km from the HCV area. A total of 24 species from 13 families were caught in the mist nests. The highest bird diversity (S=14; H’=2.14) were recorded in location adjacent to HCV area in June 2014. Most birds captured were insectivores. However, based on the number of individuals, the understory bird community in oil palm plantation was dominated by frugivores from the family of Pycnonotidae. Brood patch was detected in birds found in both locations indicating use of the habitat for breeding.

International Biotechnology Conference on Estate Crops 2017

PrefaceBiotechnology techniques are carrying forward plantation crop development in attempts to understand the genetic basis of the crops, to produce tissue-cultured plantlets on a large scale, to employ molecular breeding of new cultivars for increased yield, resistance to pests and tolerance to environmental stresses, and to use microorganisms for bio-based products, soil healthiness and waste treatment.The Indonesian Research Institute for Biotechnology and Bioindustry (IRIBB) has organized an International Biotechnology Conference on Estate Crops 2017 on 18- 20 October 2017 in Grand Sahid Jaya Hotel Jakarta, Indonesia. This Conference was in conjunction with the World Plantation Conferences and Exhibition 2017 (WPLACE-2017) on 18 October 2017. WPLACE-2017 provided General Topics (GTs) on related subjects.It is truly meaningful for the Indonesian Research Institute for Biotechnology and Bioindustry (IRIBB) to hold the first International Biotechnology Conference on Estate Crops 2017 (IBCEC-2017), an international forum for biotechnology and exposition. The institution was founded in 1901 by the Dutch colonial government under the name of Centrale Proefstations Vereniging (CPV). In 1957, during the expropriation firms of the Dutch plantations in Indonesia, CPV was repossessed by the Indonesian government. For many years since the CPV, it has undergone many name changes until 2015 in which the Indonesian Research Institute for Biotechnology and Bioindustry (IRIBB) was officialised. The IRIBB carries a vision to be an innovative and internationally research-based institution in biotechnology and bioindustry.The conference program included honourable lectures from eminent experts on the success stories and the recent development of biotechnology such as bioinformatics, genome editing, genomic selection, in vitro propagation, phytobiome, biostimulant, bioplastic, biopesticide, and biofermentation.

Composition And Biodiversity Of Insect Species In Wheat Cultivation In Gayo Highland

The need for wheat in Indonesia continues to increase and reaches 3.9 million tons per year. Around 80% of this requirement are supplied from, Canada, Australia and the United States. Gayo highland that belongs to the territory of Aceh province is potential for wheat plantation in Indonesia. Wheat plantation, however, faces various problems, one of them is pest attack. Various insect species come to wheat plantation and are predicted to get food sources both from vegetative and generative stages. The objectives of this study were to investigate composition and diversity of insect species in wheat plant either in vegetative or generative stages by adopting survey method. The results showed that total insects found in wheat plants were 2,858 individuals covering 13 ordos. Occurrence and diversity of the insects, either in vegetative and generative stages, tend to similar.

The Value Chain Analysis to Support Industrial Cluster Development of Oil Palm-Cattle Integration in Pelalawan Regency

<p>As a region with the largest oil palm plantations in Indonesia, Pelalawan Regency is highly potential to develop a program of oil palm-cattle integration. Pelalawan has implemented the program legitimated by Regent Decree Number KPTS./524/Disnak/2012/472 regarding Zoning Regulation on the development of Oil Palm-Cattle Integration. The program of oil palm-cattle integration itself has been the basis for the Decree of the Minister of Agriculture Number 105 Year 2014 regarding the Integration of Oil Palm Plantation and Beef Cattle Farming. Moreover, the integration system of oil palm-cattle gives a lot of benefit to farmers, for example the utilization of manure as organic fertilizers could reduce farmer’s expenses for chemical fertilizers and the cattle can be an asset for them. Products made from the integrated program are solid manure, liquid organic fertilizer, fodder, biogas, and beef. To improve the competitiveness of those activities, we can analyze the value chain which includes product design, inbound logistics, operations, outbound logistics, marketing, sales, services and supporting activities. By using a value chain analysis, this study aims to provide recommendations for strengthening programs which could be implemented to improve the value-added of the products.</p><p> </p><p>Keywords: oil palm-cattle integration, value chain, value-added, industrial cluster</p>

The Influence of Organizational Culture Toward Work Satisfaction and Motivation to Organizational Commitment in Indonesian Plantation Company (Case of AALI Tbk)

The main focus on this research is about human resource management in the plantation company that has different organizational cultures. This research was aimed at: (a) Analyzing the influence of organizational culture toward work satisfaction and organizational commitment; (b) Analyzing the influence of motivation toward work satisfaction and organizational commitment; (c) Analyzing the influence of motivation toward organizational commitment; (d) Analyzing the Relation Among organizational culture, work satisfaction, motivation and organizational commitment variables. This research took samples from two affiliates company of AALI Tbk of 214 respondents. The research instrument is closed questionnaire, while the simultaneous analysis tool to test the model is structural equation modeling (SEM). The research result showed that organizational culture has positive influence directly and indirectly to the work satisfaction and organizational commitment. The work satisfaction has positive influence directly or indirectly toward motivation and organizational commitment. Motivation influence organizational commitment.

Twists, turns and trade: A new look at the Indian Screw tree (Helicteres isora)

Ethnopharmacological relevanceThis is the first study of global trade in fruits of the widely used traditional medicine, Helicteres isora L. It is used in Ayurvedic, Siddha, Unani medical systems and/or local folk traditional medicines in Bangladesh, India and Pakistan. The roots are used in Traditional Chinese Medicines in China and the fruits in jamu products in Indonesia, Malaysia and Thailand. In addition, H. isora fruits are also used in "traditional" medical systems far beyond the natural distribution of this species, for example in Zulu herbal medicine (South Africa) and Kurdish herbal medicines (Iraq). Aims of the studyThis study had three aims: (i) to assess the global trade in H. isora fruits; (ii) to study the H. isora trade from West Timor to Java in terms of actors and prices along the value chain and (iii) to get a better understanding of the potential of this species to improve household income in eastern Indonesia. Materials and methodsThis study uses historical records, a contemporary analysis of global trade data (2014–2016) and field assessments of value chains and the biological factors influencing H. isora fruit production. ResultsGlobally, the major exporter of H. isora fruits is India, which exports H. isora fruits to 19 countries, far beyond the natural geographical distribution of this species. Over a 36-month period (January 2014–December 2016), India exported 392 t of H. isora fruits, with a Free-On-Board (FOB) value of Indian rupiah (INR) 18,337,000 (US$ 274,055). This represents an average annual export quantity of about 130,526 kg/year. Over this three year period, most of these exports (85.5%) were to Indonesia (346.58 t), followed by Thailand (6.85%). Indian H. isora exports are also used in many other medical systems, including Kurdish and Zulu “traditional” medicines in Iraq and South Africa. Formation of an Indian diaspora in Bahrain, Mauritius, South Africa, Tanzania and Trinidad and Tobago over the past 130 years is one of the drivers of H. isora fruit trade outside the natural geographic distribution of the species. In Indonesia, demand for H. isora fruits is supplemented by an intra-island trade in Java and an inter-island trade from East Nusa Tenggara. West Timor, for example, exports around 31–37 t of air-dried H. isora fruits per year to Java. At the farm gate, local harvesters in West Timor get 4000 IDR (c. 0.3 US$) per kg, with businesses in Java paying 25,000 IDR (c.US$2) per kg for H. isora fruits. This is similar to the price paid for H. isora fruits imported from India to Java. ConclusionsIndia is the major exporter of whole dried H. isora fruits, including to countries where this species has never been in traditional use. In Indonesia, H. isora fruit extracts are used in the cosmetic industry as well as in jamu herbal medicines, including “Tolak Angin”, the country's most popular commercial “jamu” preparation. Indonesia also is the major importer of H. isora fruits from India. In eastern Indonesia, improved income to local villagers from the H. isora fruit trade could come from improved H. isora fruit quality due to better drying techniques. This would also reduce health risks along the supply chain from to mycotoxins that have been recorded on poorly dried H. isora fruits. There also is an opportunity for cultivation of H. isora in small-holder teak plantations in Indonesia, with harvest of H. isora fruits as well as the medicinal bark.

Production of a Polyclonal Antibody against the Recombinant Coat Protein of the Sugarcane Mosaic Virus and Its Application in the Immunodiagnostic of Sugarcane

Sugarcane mosaic virus (SCMV) is a mosaic disease that has spread over sugarcane plantations in Indonesia. The important step to overcome the disease is to detect the pathogen as early as possible. Detection of the pathogen can be achieved using the immunodiagnostic method by employing a specific antibody against the viral coat protein. The objective of this research was to produce a polyclonal antibody using the recombinant coat protein of SCMV, and to test its sensitivity for detection of SCMV in the symptomatic plant. The gene encoding of the coat protein was cloned using the RT-PCR Kit and total RNA isolated from symptomatic sugarcane leaves cultivar PS-881. Nucleotide sequences analysis of the cloned cDNA indicated that the cDNA contained 998 nucleotides and named SCMVCp-cDNA. The cDNA was then inserted into a His-tag expression plasmid of pET28a and overexpressed in Escherichia coli BL21 (DE3) to produce a recombinant protein. The recombinant fused protein SCMVCp was strongly expressed in an insoluble fraction, with a molecular size of around 44 kDa, without the addition of an IPTG inducer. Purification of the recombinant protein using an affinity Ni-NTA resin, followed by SDS-PAGE separation, resulted in a high purity of the protein and used as an antigen to raise the polyclonal antibody in a rabbit. The sensitivity of the antiserum determined by western blot analysis showed that the antiserum was able to detect the recombinant protein at a concentration of 10 ng. The western blot analysis also detected a clear single band of 36.7 kDa of the SCMV coat protein in symptomatic sugarcane leaves and not in healthy leaves. Interestingly, when the sample proteins were prepared using low-speed centrifugation, the corresponding coat protein was detected in a soluble fraction by western blot analysis. Thus, the antiserum was successfully used for indirect-ELISA analysis using the soluble protein fraction. The results provide an easy method to detect and diagnose SCMV infection using the immunodiagnostic.

Mapping of smallholder oil palm plantation and development of a growth model

Smallholder plantation accounts for 39% of total oil palm plantation in Indonesia, which is currently estimated at 12 million ha. Limited information on spatial distribution of smallholder oil palm and the growth of plantation pose a great challenge for providing information in scientific based. Therefore, information on smallholder oil palm plantation are necessary and they will give valuable input for policy maker and related stakeholders. This study is aimed to generate smallholder oil palm distribution map using optical satellite data of SPOT 7 and investigate the backscatter values of ALOS PALSAR-2 with height and age of oil palm in mineral soil and peatland. We mapped 46,756 ha of smallholder plantation or about 18% of total oil palm plantation in district of Kotawaringin Barat, Central Kalimantan province and 14% of which is located on peatland area. From the result, height to age mineral soil has a strong relationship with R2 value 0.80 but weak in peatland with R2 value 0.31. Relationship between height and backscatter in mineral soil has R2 value 0.43 for HH and 0.30 for HV and in peatland 0.28 for HH and 0.15. Relationship between age and backscatter in mineral soil has moderately strong correlation with R2 value 0.55 for HH and 0.37 for HV and in peatland 0.36 for HH and 0.28. In all relationship, independent variables are statistically significant with Significance-F value lower than 0.05. In general, height, age, and backscatter relationship in peatland is lower than in mineral soil. Backscatter value can be useful for studying height and age of smallholder oil palm. Further studies are suggested to involve more potential variables and utilize multi temporal datasets in determining height and age of oil palm trees using backscatter values.

Palm oil intensification and expansion in Indonesia and Malaysia: Environmental and socio-political factors influencing policy

Intensification and expansion are two essential tenets of commercial agriculture. This paper analyses trends of intensification and expansion at the national level, particularly in the oil palm sector in Indonesia and Malaysia. Despite similar starting points and also comparable rates of increasing productivity and profit in this sector, both countries have developed almost opposite trajectories of land use. While both intensification and expansion has occurred in these countries, national indicators show that Malaysia has largely pursued intensification while Indonesia has overwhelmingly favoured expansion. Using the framework of the Jevons paradox, this paper contributes to the existing literature by arguing how and why political and social factors, rather than technology and market incentives, can better account for the differences between yield and land use efficiency in Indonesia and Malaysia today. The paper argues that expansion in Malaysia has been curtailed by the Malaysian government's pledge to maintain at least 50% forest cover in the late 1990s, coupled with a government supported corporate strategy of establishing plantations in Indonesia. Indonesia has made no such pledge, leading to expansionist policies focused on market creation and production goals with limited incentives for technology-driven intensification. It also notes however that in recent years, new socio-political developments in both countries may yet change this clear dichotomy of opposing land use strategies between these two countries, namely Sarawak's recent autonomous tendencies over land use and Indonesia's new leadership and international No Deforestation Peat and Exploitation (NDPE) commitments.

FERTILISER APPLICATION PRACTICES AND NUTRIENT DEFICIENCIES IN SMALLHOLDER OIL PALM PLANTATIONS IN INDONESIA

SUMMARYOil palm has become an important source of revenue for smallholders in Indonesia, but productivity of smallholder plantations is generally poor. Nutrient limitations have been suggested as an important agronomic constraint to yield. Our research aimed to quantify fertiliser use, soil and tissue nutrient status, and palm growth and yield in a sample of independent smallholder plantations. We selected 49 plantations in Indonesia in two provinces with contrasting soils. For all plantations, we obtained self-reported fertiliser use and yield data, collected soil and tissue samples, and analysed vegetative growth. More than 170 kg N ha−1year−1was applied in one site, and P was applied in excess of recommended quantities in both sites, but on average farmers applied less than 100 kg K ha−1year−1. Soils in the palm circle were poor in N, P and K in 29, 40 and 82% of the plantations, and deficiencies were measured in 57, 61 and 80% of the leaflet samples, respectively. We found statistically significant correlations between tissue nutrient concentrations and vegetative growth, but a large part of the variation in the data remained unaccounted for. Single leaf area was reduced in >80% of the plantations. Average yields were estimated to be 50‒70% of the water-limited potential. Our results demonstrate that widespread nutrient imbalances and deficiencies, especially potassium and phosphorus, occur in smallholder oil palm plantations, due to inadequate and unbalanced fertiliser application practices. These deficiencies may be an important underlying cause of the overall poor productivity, which threatens the economic and environmental sustainability of the smallholder sector.

Evaluating the palm oil demand in Indonesia: production trends, yields, and emerging issues

ABSTRACTThis paper investigates the development of domestic and international demand for Indonesian palm oil, in line with national biofuel mandates and established export markets. Domestic demand for palm oil for (i) achieving biodiesel targets and (ii) meeting food and industrial uses will reach 20 million tonnes by 2025, equivalent to 61% of Indonesian production in 2014. Thus, it is possible for Indonesia to be self-sufficient, reaching the biodiesel targets without increasing plantation areas. However, to meet both domestic and international demand, a total 51 million tonnes of crude palm oil will be needed in 2025. This requires additional land of up to 6 million hectares with current yields. The expansion of oil palm plantations in Indonesia has led to debates related to deforestation, threatened biodiversity, and greenhouse gas emissions. We show that increasing agricultural yields could serve the purpose, benefiting biodiesel production while reducing the need for new land. Therefore, we recommend that the ambitious Indonesian biodiesel mandates are pursued in combination with a strategy for increased productivity in palm oil production, utilization of degraded land to contain greenhouse gas emissions, and use of palm oil biomass residues for energy production.

Ecological Impacts of Oil-Palm Plantation on Butterfly and Bird Species Diversity

The expansion of oil-palm plantations in Indonesia is often blamed as the driving causes of deforestation and impacts on environmental changes including the destructed biodiversity. Our understanding regarding environmental impacts on biodiversity is still limited. We address this issue by examining the diversity of butterfly and bird species under two type habitat conditions in Central Borneo. We calculated the butterfly and bird species number, richness, evenness, similarity, and composition inside the established oil-plantation area comprising four large-scale plantations and seven smallholding plantations, as habitat after plantation establishment. In comparison, we did so similarly inside secondary forest and shrubs, as habitat before oil-palm plantation establishment. Our results revealed that the habitat after plantation establishment exhibited a higher number of butterfly and bird species than the habitat beforehand. However, the richness, evenness, and similarity indices for the species revealed variations, which were affected by dominant species in two habitats. The establishment of oil-palm plantation brought about significant impacts on the composition of species and affected the species similarities between two habitats. The oil-palm plantation landscape and reserved forest vegetation were essential in supporting diversity and ecological role of species on habitat condition after oil-palm plantation establishment.

STORM "GREEDY WATER" PALM OIL BASED ON ACADEMIC PERSPECTIVE

The tendentious issue of deforestation, biodiversity, "water greedy" attack ganoderma and carbon emissions continue to heat up in this decade has cornered palm plantations in Indonesia for allegedly either from outside or from inside the country becomes the base of why. To clarify these issues then this article aims to analyze the impact of oil palm plantations in terms of the water balance of plant oil palm. Water use in the oil palm plantations on average 92.05 mm/month or equivalent to 1104.5 mm/year over lamtoro stands is 3,000 mm/year, acacia 2,400 mm/year, sengon of 2,300 mm/year, amounting tea 900 mm/year, rubber amounted to 1,300 mm/year, bamboo amounted to 3,000 mm/year and teak amounted to 1,300 mm/year. The coefficient of oil palm crop of 0.93. The percentage amount of rainfall used palm oil amounted to only 39.60% of the annual rainfall. Percentage of evapotranspiration value is smaller than the value of evapotranspiration pine percentage of 64.5%, A. mangium 68.8%, amounting to 55.1% of ferns and eucalyptus (E.alba) amounted to 52.4%. Meanwhile, rubber plant has a value of 1 kc, other crops such as rice, during the period of growth has kc values between 1.05 to 1.2. Soil water content (KAT) which indicates the storage capacity of the root zone of oil lower than the root zone rubber (Rusmayadi, 2011). This is due to the oil more roots growing in the topsoil to a depth of ± 1 meter and as you go down the less. Rooting most densely contained at a depth of 25 cm. Therefore the ability of smaller savings in oil palm plantations compared to rubber, then the excess water will be removed or overflowed (Ro) is not taken ("greedy water") by palm trees. Palm oil as a commodity to be seen objectively with regard to the nature of biological (plant roots), physiological (crop coefficient), and environmental (water storage capacity). This is to straighten out the problems that it is not water but greedy oil plantation management who do not pay attention to aspects of water conservation.

Analysis Of Coffee Production In Indonesia

Indonesia is one of the largest coffee producing and exporting countries in the world, where coffee crops also contribute to the Indonesian economy. In general there are two types of coffee grown on Indonesian coffee plantations namely Robusta and Arabica Coffee. Robusta coffee is a coffee that has a higher production when compared with arabica coffee. Until now, the total area, production and productivity of coffee plantations in Indonesia, both from Robusta coffee and arabica coffee are still dominated by public plantation (PR) with 95.37% of coffee area. The area of coffee production in Indonesia is estimated to be about 1.3 million hectares, spread across North Sumatra, Java, and Sulawesi. Robusta coffee is commonly planted by farmers in South Sumatra, Lampung and East Java, whereas arabica coffee is commonly planted by farmers in Aceh, North Sumatra, South Sulawesi, Bali and Flores.

PEMANFAATAN SERAT JERAMI SEBAGAI PAPAN MATRIX COMPOSITE (PMC)

Kampar Regency is one of the districts that has the largest oil palm plantations in Indonesia, with a plantation area of 241.5 thousand hectares and around 33 Palm Oil Mills (POM). In every palm oil mound industry which rises higher every day, waste in the form of shells and pulp fibers or straw fibers on the ground as large as a soccer field and also emits an unpleasant odor. Only a small portion of this waste is used as boiler fuel. One MCC can produce no less than 100 tons of fiber per week. This fiber has a high economic value, this fiber is easy to get, cheap, does not endanger health can be degredated (biodegradibility) so that if given the right handling with utilization as a composite reinforcing fiber can provide more benefits to the Palm Oil Mill (POM) and the environment in the treatment of these wastes

Nutritional imbalance in smallholder oil palm plantations in Indonesia

In Indonesia more than 40% of the area under oil palm is owned by smallholders. The productivity in smallholder plantations is usually less than in large plantations, and limited fertiliser applications may be one of the key reasons. We investigated the use of fertilisers by > 300 smallholder farmers in Sumatra and Kalimantan, some of whom were involved in training programmes aimed at yield improvement. In our sample, the total applications of N were largest (166 kg ha−1 year−1), followed by K (122 kg) and P (56 kg). The applications of K were insufficient to compensate for the off-take with a production of 20 tonne fruit bunches ha−1 year−1, while N applications were excessive. On average, farmers applied 1130 kg fertiliser ha−1 year−1, and relied strongly on subsidised fertilisers, especially NPK Ponska (66%) and urea (39%). The average costs for fertiliser application were USD 225 ha−1 year−1. Trained farmers applied significantly more P in one research area, but for the other nutrients and research areas, there was no significant difference between trained and untrained farmers. Plantation size and nutrient application were weakly correlated in some areas, but not in the sample as a whole. Previously reported nutrient application rates were mostly less than our findings indicated, suggesting that actual nutrient limitations may be more severe. To overcome nutrient limitations and enhance nutrient use efficiency, we recommend that fertilisers are used in the correct balance; a ground cover vegetation is maintained to protect against erosion; and the application of empty fruit bunches is encouraged.

The plantation and the mine: Comment on “After the land grab: Infrastructural violence and the ‘mafia system’ in Indonesia’s oil palm plantation zone” by Tania Li

This paper is a commentary on Tania Li's paper, “After the land grab: Infrastructural violence and the 'mafia system' in Indonesia's oil palm plantation zone.” In her paper, Tania Li considers plantations as a spatial, politico-economic and socionatural assemblage. Drawing on her recent work on African palm plantations in Indonesia, Li asks not only what is lost with the establishment of plantation, but also and perhaps more importantly, what is newly produced? The present paper notes the striking similarities between plantations and mines as territorialized sites of capital accumulation conditioned on radical ecological and social simplification.

Design of transportation and distribution Oil Palm Trunk of (OPT) in Indonesia

This research initiated from the area of oil palm plantations in Indonesia 13 million hectares, triggering consternation of abundance of oil palm trunk when garden regeneration is done. If 4 percent of the area is rehabilitated every year, almost 100 million cubic feet of oil palm will be trash. Biomass in the form of pellets can be processed from oil palm trunk. It is then disseminated back to the palm oil processing area into biomass. The amount of transportation cost of the used ships and trucks was defined as parameters. So the objective function determined the type and number of ship and truck trips that provide the minimum transportation cost. To optimize logistics transportation network in regional port cluster, combining hub-and-spoke transportation system among regional port with consolidation and dispersing transportation systems between ports and their own hinterlands, a nonlinear optimization model for two-stage logistics system in regional port cluster was introduced to simultaneously determine the following factors: the hinterlands serviced by individual ports and transportation capacity operated between each port and its hinterland, cargo transportation volume and corresponding transportation capacity allocated via a hub port from an original port to a destination port, cargo transportation volume and corresponding transportation capacity allocated directly from an original port to a destination port. Finally, a numerical example is given to demonstrate the application of the proposed model. It can be shown that the solution to the proposed non-linear model can be obtained by transforming it into linear programming models.

Aggregation pheromones for monitoring the coconut rhinoceros beetle (Oryctes rhinoceros) in Jerukwangi Village, Jepara, Indonesia

Oryctes rhinoceros (Coleoptera: Scarabaeidae) is the most serious pest of coconut plantations in Indonesia. Jerukwangi Village is O. rhinoceros attacked one of the coconuts producing villages with more than 75% of the coconut plant population O. rhinoceros. The study aimed to monitor the population and analyze the sex ratio of O. rhinoceros that were attracted to aggregation pheromones in the field. Aggregation pheromones is a chemical compound containing Ethyl 4-methyl octanoate. The pheromone compounds were placed in traps (buckets), hung 2 meters above the ground. The traps were observed, and the beetles trapped were counted every week. In 12 weeks of monitoring, the traps captured 101 insects consist of 90.1% O. rhinoceros and 9.9% other insect species (Rhynchophorus ferrugineus and Xylotrupes gideon). This result indicates the high population of O. rhinoceros in the field. Aggregation pheromone is useful for attracting females. Rhinoceros by 61% and the males by 39%. The advantage of research is it can be used in integrated pest management (IPM) packages for monitoring of beetle population, and removal of beetles.