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KAJIAN TINGKAT PENCEMARAN UDARA OLEH GAS NH3 DAN H2S PADA PROSES PENGOMPOSAN SECARA AEROB

Agrotekno Vol. 13, No. 1 Februari 2007
Publisher : Agrotekno

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Abstract

This  research  objective  was  to  know the  level  polutan  of NH3and  H2S  from  aerobic  composting  process.  Modified  Briski method  was  use  to  identification NH3 and   H2S.  Pada  metode Briski  et al. (2003)  tidak  ada  pengukuran  gas  NH3 and  H2S. Both  polutan  were  colect  at  solvent  BaCL2 and  H2SO4 0.1  N along  one  week,  than  the  level  of    concentration  at  air  were identificated by chromatography method. The level concentration of NH3 at the air was 0.092 ppm to 0.25 ppm, and the level polutan of H2S to the air  was 0.3 ppm to 1.1 ppm. Both polutan were below from standard of SNI.

PERUBAHAN SIFAT FISIK SAMPAH ORGANIK PADAT PADA PROSES PENGOMPOSAN SECARA OPEN WINDROW DI BIOREAKTOR TIPE SETENGAH SILINDER

Agrotekno Vol 13, No.2 Agustus 2007
Publisher : Agrotekno

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Abstract

This research was to identification physical properties change along organic municipal solid waste composting. Bulk density, moisture content, particle size of compost, and porosity were observed every one week at three point deep of composting process. Oxygen concentration at the critical point was observed for cheking the diffusion potential of air, observation of it was everyday by cosmotector tipe XPO-317. Relation equation between bulk density, porosity and moisture content with time of composting were described by ? = -0.0966 t2 + 9.23 t + 147.8 with value of was r2 = 0.95, ? = - 0.0292Ln(t) + 0.745 with value of was r2 = 0.944, and Mc = - 0.0785Ln(t) + 0.8685 with value of was r2 = 0.95. Process should be futher supported with a turning over of the compost done weekly so the availability of O2 at 50 to 190 g kg-1 air.

SIMULASI PENGENDALIAN SUHU DI RUMAH TANAMAN JAMUR TROPIKA

Agrotekno Vol. 14, No. 1 Februari 2008
Publisher : Agrotekno

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Abstract

A green house that roofed by using transparent materials such as glasses, fiberglass, plastic, etc. could provide an optimum growth environment for plants such as mushrooms. However, green house effect during the day leads to a higher temperature inside the green house in comparison to the outside temperature. In order to provide an optimal environment for growing mushrooms in a green house, it is required a temperature machine control which is able to bring the room temperatures between 160C to 210C. The dynamic of room temperature can be predicted by using a mathematical model simulation. A stimulation model developed by using Matlab program could be implemented in a temperature control machine in order to bring the room temperature between 160C, 190C and 210C. Research results showed that it took 16.8 minutes, 26.4 minutes, and 30 minutes to bring the room temperature down to 160C, 190C and 210C respectively. When the room temperature reaching the target temperature, the room temperature were varying within 0.010C.

PERUBAHAN SIFAT FISIK SAMPAH ORGANIK PADAT PADA PROSES PENGOMPOSAN SECARA OPEN WINDROW

Agrotekno Vol. 15, No. 1 Februari 2009
Publisher : Agrotekno

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Abstract

This research was done with aim to identify physicalproperties changes during composting process of organicmunicipal solid waste. Bulk density, moisture content,particle size, and porosity of produced compost wereobserved every one week at three point depth of compostingprocess. Oxygen concentration at the critical point wasobserved for checking the diffusion potential of air. Thisobservation was done everyday by using Cosmotector typeXPO-318.Relation equation between bulk density, porosity andmoisture content with time of composting product weredescribed by ? = -0.0966t2 + 9.23t + 147.8 with the value ofR2 = 0.95, ? = -0.0292ln(t) + 0.745 with value of R2 = 0.944,and Mc = -0.0785ln(t) + 0.8685 with r2 = 0.95. Processshould be futher supported with a turning over of thecompost which done weekly so the availability of O2 atamount of 50 to 190 g/kg air.

APLIKASI KOMPOS SEBAGAI PUPUK ORGANIK UNTUK MENINGKATKAN KANDUNGAN FENOL PADA TANAMAN JAHE MERAH

Agrotekno Vol. 15, No. 2 Agustus 2009
Publisher : Agrotekno

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Abstract

This research was aimed to optimize the production ofvolatile oil and oleoresin of red ginger crops by optimizingthe usage of compost as fertilizer. Compost was applied as anorganic fertilizer to red ginger crops in poly-bag withfertilization doses 0, 0.2, 0.4, 0.6, 0.8, and 1 kg for one kgcrops planting and red ginger was harvested at 8 and 9months after planting.Red ginger contained volatile oil of 3.8-3.97% DM, totalphenol of 5.7 - 6.4% DM, and ability to catch free radical ofDPPH compound of phenol of 2.5 - 2.6% DM. The quality ofthe red ginger was measured at the age of between 8 and 9months. Depended upon its volatile oil content, ability tocatch free radical DPPH compound of phenol, and its contenton phenol, hence harvest time of ginger could be minimizedto 8 months.

PELATIHAN PEMANFAATAN POWER THRESHER DAN MANAJEMEN USAHA BAGI KELOMPOK USAHA PANEN PADI PEMULA DI SUBAK DESA KABUPATEN GIANYAR

Jurnal Udayana Mengabdi Vol 9, No 2 (2010): Volume 9 No.2 – September 2010
Publisher : Jurnal Udayana Mengabdi

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Abstract

Policy of product increase of national rice requires the development of adequate post harvest handling to improve efficiency, decreasing of losing crop, improving rendemen, added value, and competitiveness. This was done in order to improve earnings and prosperity of farmer in is the rural areas. Efforts to improve side of offfarm paddy especially its postharvest nowadays become attention to be handled seriously.Activity of this training aims at: (1) forming paddy crop group as development of business unit; ( 2) empowering of beginner paddy crop group so that they can apply postharvest technology and manage its agribusiness well; ( 3) training farmers to apply power thresher to minimize losing paddy crop. Participant target in this activity is group member of Subak Desa of Gianyar Regency.The result of this community services activity are as follows ( 1) Socialization of postharvest paddy have improved the understanding of beginner group member of paddy harvest so that they can contribute in lessening the lose paddy crop; ( 2) Forming crop group as the institution for empowering member of subak for developing of business unit; and ( 3) Applied training of power thresher can improve skillful harvest group members to minimize the lose of paddy crop in threshing.

A Simulation Model of Composting of Organic Municipal Solid Waste in A Bioreactor

Forum Pasca Sarjana Vol 30, No 1 (2007): Forum Pascasarjana
Publisher : Forum Pasca Sarjana

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Abstract

Municipal solid waste or MSW has potency to be decomposed by microorganisms and trasformed into compost.  The waste contains 60%-75% of organic materials C, H, O, and N.  The aim of this research was to develop a simulation model based on mathematical equations describing the phenomenon of the  composting.  The population of  microorganisms , the rate of  O2 consumption , the rate of CO2 production , the rate of H2O production, the rate of carbon nitrogen ratio or C/N, and temperature were the variables tested in this research.  Validation was carried out by comparing datum of simulation model with datum of composting.  Simulation model was declared valid if the values of each parameter were  r2 > 0.75, the  total value of Err was closed  to zero, and the distribution of Err was independent to time.  The sensitivity test was analyzed by comparing the value changes of variable tied with the value changes of free variable.  Correction from the simulation model in predicting the microorganism population, CO2, O2, and temperature  could be  expressed  respectively  as  y’ = 1.06(y-1.003),  y’ = 1.07(y+ 0.07), y’ = 1.02(y+ 0.05), and y’ = 1.02(y - 1.05).  The temperature, the C/N and the rate of  O2 consumption were sensitive to the changes of microorganism population and the radius of the bioreactor.   Key words: composting, organic materials, simulation, bioreactor

Kajian Atmosfir Terkendali untuk Memperlambat Penurunan Mutu Buah Mangga Arumanis selama Penyimpanan

Jurnal Hortikultura Indonesia Vol 2, No 1 (2011): Jurnal Hortikultura Indonesia
Publisher : Perhimpunan Hortikultura Indonesia

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Abstract

Arumanis Mango (Mangifera indica L. cv Arumanis) which is one of Indonesia’s tropical fruits having a high potency to be developed as an export commodity. Limited volumes of the fruit have been exported using air cargo and attempts in using sea freights with reefer containers for long distance market had not given convincing result. Therefore, efforts in optimizing the use of a reefer container are essential. Investigations, were performed in order to decelerate the deterioration fruits which involved different combined concentrations of O2 and CO2 gases during storage of Arumanis mango at cold (12+1.5oC) and room (28+2oC) temperatures. Four different combined gases of O2 and CO2, namely 5% O2 and 5 % CO2; 5% O2 and 10% CO2; 10% O2 and 5% CO2; and 10% O2 and 10% CO2 were surged surrounding the fruits stored at the cold and room temperatures. Fruits without treatments with the combined gases were prepared as kontrols. The investigation indicated that the cold temperature of storage was still the best way to slowing down the deterioration of the fruit. There were no significant different effects on the rate of deterioration among the fruits treated with the different combined concentrations of O2 and CO2. The controlled atmospheres, however, were better for storing the fruits compared to those stored without controlled atmosphere.Key words: controlled atmosphere, Arumanis, mango

OPTIMALISASI PROSES FERMENTASI URIN SAPI MENJADI BIOURIN

beta (Biosistem dan Teknik Pertanian) Vol 1 No 1 Tahun 2012
Publisher : beta (Biosistem dan Teknik Pertanian)

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Abstract

Telah dilakukan penelitian mengenai fermentasi urin sapi menjadi biourin. Tujuan penelitian ini adalahmengoptimasi proses fermentasi urin menjadi biourin dengan pemberian starter dan gula merah. Penelitian inimenggunakan Rancangan Acak kelompok pola faktorial 2 faktor dengan 3 taraf perlakuan. Faktor pertamaberupa perlakuan konsentrasi starter Rumino bacillus dengan konsentrasi 0 ml, 15 ml dan 30 ml. Faktor keduaadalah perlakuan gula merah 0, 15 dan 30 g. Masing-masing perlakuan di ulang sebanyak 3 kali. Variable yangdiamati adalah pH, total asam, total padatan terlarut, C-organik dan N-total. Hasil penelitian menunjukan bahwapenambahan starter R. bacillus sejumlah 15 - 30 ml dan gula merah 15 - 30 g dalam 1.500 ml urin sapi dapatmempercepat produksi biourin dalam proses fermentasi urin sapi yang diambil dari Simantri nomor 225. Umururin sapi sebelum diproses yaitu satu hari dari saat dikeluarkan oleh sapi dewasa. Proses fermentasi dilakukanselama 7 hari dapat dipercepat menjadi 5 hari, hal ini ditandai dengan stabilnya nilai pH, total asam dan totalpadatan terlarut mulai hari ke-5. Konsentrasi starter R. bacillus 30 ml dengan penambahan gula merah 30 g pada1.500 ml urin sapi yang difermentasi merupakan perlakuan optimal yaitu nilai pH 6, total asam 0,5%, totalpadatan terlarut 3,80Brix. Hal ini didukung oleh standar dari Permentan Nomor 70 dengan nilai pH 4 - 9. Namun,penelitian untuk nilai C-organik dan N-total belum cukup memenuhi standar Permentan yaitu C-organik 6% danN-total 3-6%.

PENGARUH PEMBERIAN KOMPOS PADA BUDIDAYA TANAMAN KACANG TUNGGAK TERHADAP ERODIBILITAS TANAH

beta (Biosistem dan Teknik Pertanian) Vol 1 No 1 Tahun 2012
Publisher : beta (Biosistem dan Teknik Pertanian)

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Abstract

Penelitian ini dilakukan dengan tujuan untuk mengetahui pengaruh pemberian kompos padabudidaya kacang tunggak terhadap erodibilitas tanah. Penelitian ini juga diharapkan dapatmemperbaiki sifat fisik tanah dan mengurangi erosi suatu tanah. Rancangan yang digunakan adalahRancangan Acak Kelompok di mana perbandingan tanah dan kompos terdiri dari 6 tingkatan yaitutanah 100%; 97,5% tanah : 2,5% kompos; 95% tanah : 5% kompos; 92,5% tanah : 7,5% kompos;90% tanah : 10% kompos; 87,5% tanah : 12,5% kompos; dan 85% tanah :15% kompos. Penelitiandiulang sebanyak 3 kali. Parameter yang diamati dalam penelitian ini adalah sifat fisik tanah antaralain: struktur tanah, permeabilitas tanah, tekstur tanah, dan sifat kimia tanah yaitu bahan C-organiktanah, maupun penentuan nilai erodibilitas tanah. Hasil penelitian ini menunjukkan bahwa perlakuankompos pada tanah dalam budidaya kacang tunggak berpengaruh nyata terhadap tekstur tanah,permeabilitas tanah, dan bahan C-organik tanah tetapi tidak berpengaruh nyata terhadap strukturtanah. Hasil penelitian menunjukkan perbandingan tanah dan kompos pada budidaya kacang tunggak85% : 15% merupakan perlakuan terbaik untuk mendapatkan nilai erodibilitas tanah yang rendah.