scholarly journals Feasibility studies of intensively tea plantation on West Java

2019 ◽  
Vol 393 ◽  
pp. 012080
Author(s):  
M I S Sule ◽  
S Y Siswanto
Keyword(s):  
Feasibility Studies ◽  
West Java ◽  
Tea Plantation

THE EFFECT OF MICRO PARTICLE STEEL SLAG ON P-RETENTION AND PH ON ANDISOL

2019 ◽  
Vol 24 (2) ◽  
pp. 121-128
Author(s):  
Ai Ening Rostini ◽  
Rina Devnita ◽  
Oviyanti Mulyani ◽  
Benny Joy
Keyword(s):  
Soil Ph ◽  
Soil Acidity ◽  
Steel Slag ◽  
Soil Physics ◽  
West Java ◽  
Tea Plantation ◽  
Physics Laboratory ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
P Retention

This study was aimed at determining the effect of microparticles steel slag towards P retention, soil acidity in Andisol from Ciater, West Java. The research was conducted in November 2017 until January 2018. The andisol was taken from the PTPN XIII-Ciater Tea Plantation, Subang, while steel slag was obtained from PT. Krakatau Steel Indonesia. The study used a Completely Randomized Design consisting of 11 treatments and 3 replications so that the total of all treatments was 33 experimental polybags. The treatments given were  500 mesh steel slag and 1.7 µm steel slag. The incubation media were stored in the Soil Physics Laboratory of the Faculty of Agriculture at UNPAD for 2 months. The observed parameters were P retention analyzed by the Blakemore method and soil pH which was analyzed by the electrometry method. The results show that the steel slag microparticles significantly affected the reduction in P retention and increased pH in Andisols. The best dose for increasing the pH is 7%. Steel slag with a size of 1.7 µm is able to increase the pH from 4.53 to 7.99 after a two-month incubation.PENGARUH PARTIKEL MIKRO TERAK BAJA TERHADAP RETENSI P DAN PH PADA ANDISOLPenelitian ini bertujuan untuk mengetahui pengaruh pemberian partikel mikro terak baja terhadap retensi P, kemasaman tanah pada Andisol asal Ciater, Jawa Barat. Penelitian telah dilaksanakan pada bulan November 2017 sampai dengan Januari 2018. Andisol berasal dari Perkebunan Teh PTPN XIII-Ciater, Kabupaten Subang, sedangkan terak baja diperoleh dari PT. Krakatau Steel Indonesia. Rancangan penelitian yang digunakan adalah Rancangan Acak Lengkap yang terdiri dari 11 perlakuan dan 3 ulangan, sehingga total seluruh perlakuan adalah 33 polibeg percobaan. Perlakuan yang diberikan yaitu kontrol, terak baja ukuran 500 mesh dan terak baja ukuran 1,7 µm. Media inkubasi disimpan di Laboratorium Fisika Tanah Fakultas Pertanian UNPAD dan diinkubasikan selama 2 bulan.Parameter yang diamati adalah Retensi P dianalisis dengan metode Blakemore, dan pH tanah dianalisis dengan metode elektrometri.Hasil penelitian menunjukkan bahwa pemberian partikel mikro terak baja berpengaruh nyata terhadap penurunan retensi P dan peningkatan pH pada Andisol asal Ciater, Jawa Barat. Sedangkan dosis terbaik dalam meningkatkan pH yakni 7% terak baja dengan ukuran 1,7 µm mampu meningkatkan pH dari 4,53 menjadi 7,99 setelah dua bulan inkubasi.

scholarly journals KAJIAN PERSEBARAN KOMODITAS TEH: PENGEMBANGAN KAWASAN PERKEBUNAN TEH DI PROVINSI JAWA BARAT

2019 ◽  
Vol 15 (3) ◽  
pp. 205
Author(s):  
Muhammad Basorudin ◽  
Aniisa Rizqi ◽  
Sri Murdaningrum ◽  
Windi Maharani
Keyword(s):  
Growth Rate ◽  
Location Quotient ◽  
West Java ◽  
Tea Plantation ◽  
Quadrant Method ◽  
Tea Plantations ◽  
Calculation Results ◽  
Tea Production

Tea is one of the main commodities that is a mainstay of Indonesian exports and has been exported to 78 countries on five continents. However, the development of the volume of Indonesian tea exports tends to decline from 2011 to 2015. Therefore, this study aims to find out which districts are potential areas and non-potential areas in West Java Province as the largest tea-producing region in Indonesia. Then, to find out the growth rate of tea production in each district in West Java Province and how the area is spread based on its potential. The method used is Location Quotient, Shift Share, and Quadrant Method. Based on the research, it was found that the area that has potential and became the basis so that its construction can contribute significantly to tea plantations in West Java Province are Bandung, Cianjur, Purwakarta, Bandung Barat, Garut, Tasikmalaya, and Sukabumi. Then, the calculation results with this quadrant indicate that the mainstay tea plantation area is in the Sukabumi, Cianjur, Bandung, Garut, and West Bandung regions.

scholarly journals Tea Plantation Dynamic in West Java Based on Productivity and Institutional Research

2017 ◽  
Vol 33 (1) ◽  
pp. 191
Author(s):  
Marenda Ishak S ◽  
Sudarsono Sudarsono ◽  
Widiatmaka Widiatmaka ◽  
Sudirman Yahya
Keyword(s):  
Dynamic Change ◽  
Weather Conditions ◽  
Land Conversion ◽  
Institutional Research ◽  
West Java ◽  
Tea Plantation ◽  
Tea Industry ◽  
Tea Plantations ◽  
Tea Production ◽  
Weather Changes

The growth of Indonesian tea industry requires a serious attention. Land conversion due to weather changes is considered as one of the reasons why the tea industry decreased. This is proved by the declining of Indonesian position as tea exporting country to rank 7.  The potential of Indonesian tea plantations is considered to be high due to both quality and quantity. This research is aimed to explore the relationship between production and weather conditions (rainfall, temperature, and humidity) that cause land conversion. Another aim is assessing the dynamic change of the institutional role within tea plantation in West Java. The first research was initiated by literature review and sampling of primary field, meanwhile the second research was conducted by interview and questionnaire in Bandung Regency and Cianjur Regency. The results showed that humidity factor determines the tea production in West Java. The institutional role as a weakened agent in all sector is a second finding. 

scholarly journals Wellness Tourism in Puncak West Java Indonesia Area

2019 ◽  
pp. 269
Author(s):  
Sri Pujiastuti
Keyword(s):  
Local Community ◽  
Positive Impact ◽  
Review Literature ◽  
Capital City ◽  
Routine Activity ◽  
West Java ◽  
Environmental Preservation ◽  
Tea Plantation ◽  
Wellness Tourism ◽  
Depth Interviews

Wellness tourism is one of the attractions that has become a trend both in Indonesia and in the world, in addition to providing business opportunities and can also have a positive impact on health and fitness that have not been managed optimally. The area that has the potential of wellness tourism is in Puncak area which is found in West Java, especially in the PTP Nusantara VIII Gunung Mas area, which has a tea plantation as well as a spring in it. The distance that is not too far from the capital city of Jakarta, makes this area a tourist destination for escape or relaxation from routine activity. This study uses a descriptive qualitative approach where data collection uses in-depth interviews, documentation and review literature from various sources and where the results obtained are presented thoroughly to get a complete picture of the potential of wellness tourism in the peak regions. The results obtained in this study are that the management and regulation of wellness tourism are felt appropriate to be developed in this area, due to the natural potential possessed in accordance with the background or motivation of tourists who come to this area. In addition, wellness tourism that is based on nature and managed jointly with the local community will contribute positively to the improvement of the economy of the surrounding community and environmental preservation that will be maintained over time. Keywords: Wellness Tourism, Puncak area

scholarly journals CO2 Flux from Tropical Land Uses on Andisol in West Java, Indonesia

2015 ◽  
Vol 19 (3) ◽  
pp. 121
Author(s):  
Jon Hendri ◽  
Basuki Sumawinata ◽  
Dwi Putro Tejo Baskoro
Keyword(s):  
Organic Matter ◽  
Soil Respiration ◽  
Root Respiration ◽  
Co2 Flux ◽  
Organic Content ◽  
Organic Matter Decomposition ◽  
Natural Forest ◽  
Land Uses ◽  
West Java ◽  
Tea Plantation

This study measured CO2 flux by segregating effect of root respiration and organic matter decomposition by microbes. The study involved a mineral soil containing high organic matter (Andisols), in the tropic devoted to different land uses i.e. natural forest, tea plantation, and horticultural farm CO2 emission from those land uses were compared to from peatland. Observed CO2 fluxes came out in the following order: bare plot  7.32, tea plantation  10.22, horticultural farm  15.60, and natural forest  15.62 Mg C-CO2 ha-1 yr-1. While, root respiration accounted for substantial proportions: tea plantation  28%, horticultural farm  53%, and natural forest  53%. Soil temperature demonstrated a significant positive correlation with the CO2 flux, except in the natural forest. On the other hand, water-filled pore spaces displayed varying correlation with site CO2 flux: a negative relationship in both bare plot and tea plantation, appreciably positive in the horticultural farm, and weakly related in the natural forest. Soil respiration and C-organic content appeared to be strongly correlated; the rate of soil respiration increased with higher C-organic content. In field, CO2 flux from organic matter decomposition in Andisols, Latosols, and peatland ranged from 5.35-13.22 Mg C-CO2 ha-1 yr-1, with root respiration contributing most of the flux, which was, in turn, influenced by type vegetation, humidity and soil temperature.Keywords: CO2 flux; decomposition; horticultural farm; natural forest; organic matter; tea plantation [How to Cite: Jon H, Suwardi, B Sumawinata and DPT Baskoro. 2014. CO2 Flux from Tropical Land Uses on Andisol in West Java, Indonesia. J Trop Soils 19: 121-130. Doi: 10.5400/jts.2014.19.3.121]     

Dependence of Current Harmonics of Greenhouse Irradiators on Supply Voltage

2020 ◽  
pp. 85-88 ◽  
Author(s):  
Nadezhda P. Kondratieva
Keyword(s):  
Mathematical Models ◽  
Supply Voltage ◽  
Harmonic Distortion ◽  
Feasibility Studies ◽  
Power Losses ◽  
Voltage Level ◽  
Supply Networks ◽  
Current Harmonics ◽  
Cable Lines ◽  
Harmonic Composition

The article describes the results of the study concerning the effect of the voltage level on current harmonic composition in greenhouses irradiators. It is found that its change affects the level of current harmonics of all types of the studied greenhouse irradiators. With decrease of nominal supply voltage by 10 %, the total harmonic distortion THDi decreases by 9 % for emitters equipped with high pressure sodium lamps (HPSL), by 10 % for emitters with electrode-less lamps and by 3 % for LED based emitters. With increase of nominal supply voltage by 10 %, THDi increases by 23 % for lighting devices equipped with HPSL, by 10 % for irradiators with electrode-less lamps and by 3 % for LED based emitters. Therefore, changes of supply voltage cause the least effect on the level of current harmonics of LED based emitters and then the emitters with electrode-less lamps. Change of the level of supply voltage causes the greatest effect on the level of current harmonics of HPSL based irradiators. Mathematical models of dependence of THDi on the level of supply voltage for greenhouse emitters equipped with LED, electrode-less lamps and HPSL lamps were formulated. These mathematical models may be used for calculations of total current when selecting transformers and supply cable lines for greenhouse lighting devices, for design of new or reconstruction of existing irradiation systems of greenhouse facilities, and for calculation of power losses in power supply networks of greenhouse facilities during feasibility studies for energy saving and energy efficiency increasing projects.

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