Jurnal KETEKNIKAN PERTANIAN, Vol. 18, No. 2, Agustus 2004 DAFTAR ISI
HAL
APLIKASI FUZZY LINEAR PROGRAMMING UNTUK OPTIMASI FORMULASI RANSUM UNGGAS Application of Fuzzy Linear Programming for Optimization of Poultry Diet Formulation Adrizal1 and Marimin2
77~85
APLIKASI METODE OPTIMASI KRITERIA JAMAK PADA MODEL PENYEDIAAN TENAGA PENYIAPAN LAHAN PADA PERTANAMAN PADI Application Multi Criteria Optimization Method for Model of Farm Power Supply for Soil Preparation of Paddy Field Arief RM Akbar 1, Bambang Pramudya 2 dan I Wayan Astika 2
86~96
PERUBAHAN TAHANAN TARIK BAJAK SINGKAL AKIBAT PERUBAHAN KADAR AIR, KECEPATAN KERJA, DAN UKURAN LANDSIDE PADA LIMA JENIS BAHAN LANDSIDE The Change of Moldboard-Plow Pulling Resistance due to Soil Moisture Content, Operation Speed, and Landside Dimension At Five Landside Material Types Hersyamsi 1), E. Namaken Sembiring 2), Radite P.A.S.2), Wawan Hermawan2), dan H.M. Surjono Surjokusumo3)
97~107
REKAYASA INSTRUMEN PENGUKUR LAJU KEBUTUHAN BAHAN BAKAR UNTUK MENDUKUNG STANDARISASI PENGUJIAN MESIN PEMIPIL JAGUNG DI INDONESIA Designing An Instrument For Measuring The Fuel Flow Rate To Support Standardization Test For Power Maize Spellers Operated In Indonesia I.K. Tastra
109~116
PENDUGAAN RUNOFF, EROSI DAN SEDIMENTASI BERBASIS MODEL HIDROLOGI WEPP DI SUB-DAS CIRIUNG, DAS CIDANAU Prediction of Runoff, Erosion and Sedimentation Based on WEPP Hydrologic Model in Ciriung Subwatershed, Cidanau Watershed Ery Suhartanto1, Soedodo Hardjoamidjojo1, Budi Indra Setiawan1, Hidayat Pawitan1 dan Nora H. Pandjaitan1
117~130
MEMPELAJARI PEMBERIAN BOKASHI PADA TANAMAN KACANG TANAH TERHADAP BESARNYA EROSI DAN LIMPASAN DI TANAH ULTISOL DARMAGA Study Of Applying Bokashi To Peanut Plant Toward The Amount Of Erosion And Runoff On Ultisol Soil At Darmaga Sukandi Sukartaatmadja1)
131~139
ANALISIS VENTILASI ALAM PADA MULTI SPAN GREENHOUSE, FAPERTA IPB Analysis of Natural Ventilation on Faculty of Agricultural IPB’s Multispan Greenhouse Meiske Widyarti1, Herry Suhardiyanto1, Rita Intan Permatasari2Abstract
140~146
PREDIKSI KERUSAKAN RESAPAN PADA DAERAH ALIRAN SUNGAI (DAS) CILIWUNG DENGAN METODE ANALISA RESESI ALIRAN DASAR Prediction of Recharge Damage on Ciliwung River Basin By Base Flow Recession Analysis Method Roh Santoso Budi Waspodo 1)
148~153
Jurnal KETEKNIKAN PERTANIAN, Vol. 18, No. 2, Agustus 2004 APLIKASI FUZZY LINEAR PROGRAMMING UNTUK OPTIMASI FORMULASI RANSUM UNGGAS Application of Fuzzy Linear Programming for Optimization of Poultry Diet Formulation Adrizal1 and Marimin2 Abstract Feed Formulation is mathematical model of establishing a blend of ingredients that meet the bird's nutrient requirements with the least cost. The most common tool to meet this goal is linear programming. However in real problem; it is difficult to satisfy certainty assumption that exists in the linear programming model. Fuzzy linear programming (FLP) has been applied to formulate the diet in some fuzzy constraints. The result of model verification indicated that the FLP can formulate the cheaper diet (Rp 2317/kg) than that did by LP (Rp 2429/kg), but small violation in tolerable range was occurred on protein, fat, lysin, tryptophan, ME, crude fiber and fishmeal constraints. Based on the result, it can be concluded that theoretically FLP is applicable in optimizing of poultry diet formulation. However, before implementing commercially, it needs to be experimented on poultry. Keyword: feed formulation, linear programming, Fuzzy linear programming
77~85
Jurnal KETEKNIKAN PERTANIAN, Vol. 18, No. 2, Agustus 2004 APLIKASI METODE OPTIMASI KRITERIA JAMAK PADA MODEL PENYEDIAAN TENAGA PENYIAPAN LAHAN PADA PERTANAMAN PADI Application Multi Criteria Optimization Method for Model of Farm Power Supply for Soil Preparation of Paddy Field Arief RM Akbar 1, Bambang Pramudya 2 dan I Wayan Astika 2 Abstract This study was aimed to get the model of farm power supply system of paddy field as a part of farming system (paddy) by using multi criteria analysis. This model is possible to make the optimal target more than one factor so that the result can be applied without constraint. Criteria used on the model at Mekarsari Farming Group are(1) the utilization of the local farmer, (2) land suitability, (3) cost of tillage, (4) cost of investment, (5) the accessibility of power sources. Analytic Hierarchy process is used to find the priority level of criteria optimization where as compromise method is used to choose alternative optimum of farm power combination. The result obtained that the 19th combination is the optimal power. That is 43 man labours, 3 buffaloes and 2 unit of hand tractor for 57 ha land with cost of tillage is Rp. 405,390,- per ha, alocation of work day per unit respectively are 45 days, 6 days and 45 days. Keywords: multi criteria, Analytic Hierarchy Process
86~96
Jurnal KETEKNIKAN PERTANIAN, Vol. 18, No. 2, Agustus 2004 PERUBAHAN TAHANAN TARIK BAJAK SINGKAL AKIBAT PERUBAHAN KADAR AIR, KECEPATAN KERJA, DAN UKURAN LANDSIDE PADA LIMA JENIS BAHAN LANDSIDE The Change of Moldboard-Plow Pulling Resistance due to Soil Moisture Content, Operation Speed, and Landside Dimension At Five Landside Material Types Hersyamsi 1), E. Namaken Sembiring 2), Radite P.A.S.2), Wawan Hermawan2), dan H.M. Surjono Surjokusumo3) Abstrak Tahanan tarik merupakan bagian penting dalam pengolahan tanah, karena akan menyangkut hasil kerja dan konsumsi energi. Banyak faktor yang mempengaruhi tahanan tarik ini. Karena itu penelitian mengenai masalah ini akan sangat membantu dalam mendapat hasil kerja yang memuaskan. Penelitian ini menggunakan bajak singkal sebagai implemen pengolahan tanahnya, karena jenis bajak ini mempunyai desain yang unik dengan bagianbagian yang masih mungkin dieksplorasi dalam upaya meningkatkan kualitas kerjanya. Penelitian ini bertujuan untuk melihat pola perubahan tahanan tarik bajak singkal akibat perubahan kadar air, kecepatan kerja, dan ukuran landside pada lima jenis bahan landside. Pola perubahan ini diharapkan dapat dijadikan acuan dalam pengembangan bajak singkal dengan kemampuan kerja yang memuaskan. Penelitian ini dilakukan di Laboratorium Lapangan Alat dan Mesin Budidaya Pertanian Fateta-IPB di Leuwikopo, Bogor, yang berlangsung dari bulan Januari 2003 sampai dengan bulan September 2003. Hasil penelitian ini menunjukkan bahwa dari lima jenis bahan landside, bajak singkal dengan landside acrylic mempunyai tahanan tarik yang rendah, yaitu 83.13 kgf, dan yang paling tinggi adalah kayu, yaitu 87.23 kgf, kemudian baja sebesar 86.6 kgf, tembaga 85.97 kgf, dan alumanium 83.28 kgf. Kata kunci: bajak singkal, landside, acrylic, baja
98~107
Jurnal KETEKNIKAN PERTANIAN, Vol. 18, No. 2, Agustus 2004 REKAYASA INSTRUMEN PENGUKUR LAJU KEBUTUHAN BAHAN BAKAR UNTUK MENDUKUNG STANDARISASI PENGUJIAN MESIN PEMIPIL JAGUNG DI INDONESIA Designing An Instrument For Measuring The Fuel Flow Rate To Support Standardization Test For Power Maize Spellers Operated In Indonesia I.K. Tastra Abstract To support the implementation of the maize quality standard, it is imperative to develop standardization test for power maize shellers operated in Indonesia. One of the instruments that are very important for that standardization test is the fuel flow rate instrument (FFRI). Designing and testing activities of FFRI have been conducted in the Mechanization Laboratory of ILETRI (Indonesian Legume and Tuber Crops Res. Inst.) during the year of 1998 to 2003. FFRI consisted of a digital electronic balance (OHAUS, Model G1200) that was serially connected to the computer. Decrease of the fuel weight which was placed on the OHAUS was recorded every second. The fuel weight (g) is converted to the volume of the fuel (liter). Using the Microsoft EXCEL program, the fuel flow rate could be calculated as the coefficient of linier regression between time (hour) and weight of fuel (liter). The fuel flow rate (y') of KUBOTA RD65H at the flywheel speed (N) of 1200, 1400, 1600 and 1800 Rpm were 0.1577, 0.1751, 0.2178, and 0.2650 liter/hour, respectively at R2 (Coefficient of Determination) > 0.99. It follow the quadratic model as y' = 2E-07 N2 - 0.0004 N + 0.3401 (R2 = 0.9969). In conclusion, FFRI can be utilized to support the standardization test of power maize sheller in Indonesia after pass the calibration test. Key words: Standardization, power sheller, fuel flow rate instrumentation
108~116
Jurnal KETEKNIKAN PERTANIAN, Vol. 18, No. 2, Agustus 2004 PENDUGAAN RUNOFF, EROSI DAN SEDIMENTASI BERBASIS MODEL HIDROLOGI WEPP DI SUB-DAS CIRIUNG, DAS CIDANAU Prediction of Runoff, Erosion and Sedimentation Based on WEPP Hydrologic Model in Ciriung Sub-watershed, Cidanau Watershed Ery Suhartanto1, Soedodo Hardjoamidjojo1, Budi Indra Setiawan1, Hidayat Pawitan1 dan Nora H. Pandjaitan1 Abstract The economic crisis has forced local inhabitants to do illegal logging in Cidanau Watershed, which caused landuse changes and disturbed the ecosystem. Efforts to prevent further damages by means to conserve soil and water need techniques to predict runoff, soil erosion and sedimentation based on analytical analysis. The aim of this research was 1) to apply the techniques based on the hydrologic model and 2) to find parameters that contribute more to runoff, soil erosion and sedimentation. The optimization results showed only 4 parameters out of 54 parameters had significant influences; those are IRALT (Initial Roughness after Last Tillage), IRC (Initial Rill Cover), RS (Rill Spacing), and ISL (Initial Saturation Level). WEPP Model showed good prediction for runoff and sediment resulted 0.956 and 0.996 of the correlation coefficient (R), and produced maximum soil erosion 1,691 ton/ha/year of which lower than the tolerable soil loss. These values indicated that Ciriung sub-watershed is not in a critical condition, and meet the criteria as a cultivation zone for land farmings. Keywords: runoff, erosion, sediment, hydrological model, parameter optimization
117~130
Jurnal KETEKNIKAN PERTANIAN, Vol. 18, No. 2, Agustus 2004 MEMPELAJARI PEMBERIAN BOKASHI PADA TANAMAN KACANG TANAH TERHADAP BESARNYA EROSI DAN LIMPASAN DI TANAH ULTISOL DARMAGA Study Of Applying Bokashi To Peanut Plant Toward The Amount Of Erosion And Runoff On Ultisol Soil At Darmaga Sukandi Sukartaatmadja1) Abstract The purpose of this research is to know the bokashi fertilizer influenced erosion and runoff of peanut plantation on ultisol soil. This research was done on latosol soil at Darmaga using 8 plots of experimental land. The land site was 22 m x 2.5 m and the land slope was 9 percent. Four treatments were used in this research; each treatment has two time repetition. Treatment A is a controller. It was left naturally unplanted without bokashi fertilizer. Treatment C, it was planted with peanuts with 5 ton/ha of bokashi fertilizer. And treatment D, it was planted with peanuts with 10 ton/ha bokashi fertilizer. The amount of runoff and soil erosion on treatment A is higher than any other treaments. It was 120,82 m3/ha and 1,42 ton/ha. Meanwhile the lowest one is on treatment D. It was 44,32 m3/ha and 0,31 ton/ha. The most qualified peanut which was produced from the treatment was on the first repetition. It was 21,48 kg/plot for treatment D, 19,68 kg /plot for treatment B and 16,13 kg/plot for treatment C. From the result of the statistical analysis of bokashi fertilizer application, it was showed that there was has significant soil erosion and runoff betweent contol plot A and treament A, B, C and D. Soil erosion and runoff fom plot B, C and D has statistical analysis no significant different between treatment. Key words : Bokashi,peanuts, soil erosion and runoff
131~139
Jurnal KETEKNIKAN PERTANIAN, Vol. 18, No. 2, Agustus 2004 ANALISIS VENTILASI ALAM PADA MULTI SPAN GREENHOUSE, FAPERTA IPB Analysis of Natural Ventilation on Faculty of Agricultural IPB’s Multispan Greenhouse Meiske Widyarti1, Herry Suhardiyanto1, Rita Intan Permatasari2Abstract Greenhouse can protect plants from unexpected conditions like heavy rainfall, strong wind and insect attack. In a tropical humid greenhouse, problem that always occurs is a very high micro climate. Plants can grow optimumly only in a suitable environtment. With a proper design, suitable air temperature for plant growth can be generated. Greenhouse’s micro climate can be managed using a ventilation system. The economical way of a ventilation system is natural ventilation which utilizes wind and thermal efects. Structures and shape of a building will give big influences to the natural ventilation’s speed. This research study about natural ventilation system in a multi span greenhouse located at Cikabayan inside IPB Campus. This study found that opening for ventilation system in this building is only 26 % of the total building area which is still lower than the requirement amount (40 %). The natural ventilation speed inside the building is 0.6 – 0.8 m/s ; it is lower than the recomending speed 0,75 – 1,0 m/s. The natural ventilation is more dominated by thermal efect than wind effect. Temperature inside the building is higher 5-7° C than outside and the humidity is low. A design modification especially at the windward wall’s area should be done to get a higher rate of ventilation speed. Keywords: Multiplan, greenhouse, natural ventilation
140~146
Jurnal KETEKNIKAN PERTANIAN, Vol. 18, No. 2, Agustus 2004 PREDIKSI KERUSAKAN RESAPAN PADA DAERAH ALIRAN SUNGAI (DAS) CILIWUNG DENGAN METODE ANALISA RESESI ALIRAN DASAR Prediction of Recharge Damage on Ciliwung River Basin By Base Flow Recession Analysis Method Roh Santoso Budi Waspodo 1) Abstract Ciliwung River Basin is the first priority scale of critical river basins in Indonesia, where the increase of recharge damage from 20.32 % to 28.45 % at up stream and from 26.85 % to 34.58 % at middle stream from 1984 to 1995. Recharge is an important river basin aspect, but the Recharge Damage will continue at Ciliwung River Basin according with population increasing. The flooding on Ciliwung River from 370 m3/sec up to 600 m3/sec and groundwater storage deficit about 140 millions m3/years to water supply requirement at down stream as hydrology parameters to show the recharge damage on Ciliwung River Basin. In this research, the prediction of the recharge damage on Ciliwung River Basin by Base Flow Recession Analysis Method is conducted by considering recharge area and base flow. Mathematically, the recharge damage at up stream of Ciliwung River Basin can be written as follow: y = - 0.9104. ln (x) + 9.8932 with R2 = 0.9765. Mathematically, the recharge damage at middle stream of Ciliwung River Basin can be written as follow: y = 2.3147. ln (x) + 32.933 with R2 = 0.9146 where, y = base flow (m3/sec) x = time (day). The result of Base Flow Recession Analysis in the up stream and middle stream along 10 years (1992-2001) is the decrease trend, where the range of Ciliwung River Basin volume 33.169.251 m3 to 111.096.513 m3 at up stream and 171.429.562 m3 to 406.287.598 m3 at middle stream.
147~154
