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ANALISIS PERUBAHAN IKLIM LOKAL DAN DEBIT SUNGAI DI DAS CIDANAUANALYSIS OF LOCAL CLIMATE CHANGE AND DISCHARGE IN CIDANAU WATERSHED Irsyad, Fadli; Saptomo, Satyanto Krido; Setiawan, Budi Indra
Jurnal Agromet Indonesia Vol 25, No 1 (2011): JUNE 2011
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

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Abstract

Climate change causes uncertainty in water availability. The change may include annual rainfall, evapotranspiration and the shift of rainy and dry seasons, thus, it affects hydrological response in the region. Water demand will increase over time with population, industrial and business growth but the water availability has not been ascertained to sustainably satisfy those needs.  Cidanau Watershed has wetland ecosystem so-called the Rawa Danau (Caldera), with an area of around 2,500 ha. This watershed receives average annual rainfall around 2,500 mm. Climate change especially the local climate in the region of Cidanau was analyzed to illustrate how the relationship with Cidanau river discharge. It is expected that climate change does not affect the water availability in the watershed. In this study, the analysis of local climate change and its impact on the availability of water resources on Cidanau Watershed was based on climate trends, water balance analysis, and estimation of  discharge of Cidanau Watershed. This research was carried out using climate data and discharge from 1996 until 2010. The results showed that climate variables have changed from 1996 to 2010. This change mainly occurred in temperature, annual rainfall, and evapotranspiration. Based on the analysis, the discharge of Cidanau Watershed will decrease due to changes in rainfall and evapotranspiration. The estimated minimum river discharge of Cidanau Watershed ranges from 0.5 to 1 m3/s until 2050.
PENDUGAAN FLUKS PANAS DAN EVAPOTRANSPIRASI DENGAN JARINGAN SYARAF TIRUANHEAT FLUX AND EVAPOTRANSPIRATION ESTIMATION USING ARTIFICIAL NEURAL NETWORK Saptomo, Satyanto Krido
Jurnal Agromet Indonesia Vol 25, No 1 (2011): JUNE 2011
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

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Abstract

Artificial neural network (ANN) approach was used to model energy dissipation process into sensible heat and latent heat (evapotranspiration) fluxes. The ANN model has 5 inputs which are leaf temperature Tl, air temperature Ta, net radiation Rn, wind speed uc and actual vapor pressure ea. Adjustment of ANN was conducted using back propagation technique, employing measurement data of input and output parameters of the ANN. The estimation results using the adjusted ANN shows its capability in resembling the heat dissipation process by giving outputs of sensible and latent heat fluxes closed to its respective measurement values as the measured input values are given.  The ANN structure presented in this paper suits for modeling similar process over vegetated surfaces, but the adjusted parameters are unique. Therefore observation data set for each different vegetation and adjustment of ANN are required.
Pendinginan Zona Perakaran (Root Zone Cooling) pada Produksi Benih Kentang menggunakan Sistem Aeroponik Sumarni, Eni; Suhardiyanto, Herry; Seminar, Kudang Boro; Saptomo, Satyanto Krido
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 41, No 2 (2013): JURNAL AGRONOMI INDONESIA
Publisher : Bogor Agricultural University

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High temperature is the major constraint to potato cultivation in the lowland for it causes stress and inhibit initiation of potato tuber. This study was designed to investigate the effects of root zone cooling upon seed potato production using aeroponics system in lowland wet tropical climates. Cultivation techniques used in this study was the aeroponics system with three cooling temperatures (10, 15, and 20 oC) and control (greenhouse room temperature). Plantlet of potato ‘Granola’ variety derived from tissue culture propagation were used. The results showed that the highest number of tuber and tuber weight that can be harvested up to 90 days after planting were obtained from cooling the root zone temperature at 10 °C with the average number of tuber 14.85 tubers plant-1and average weight of tubers 409.15 mg tuber-1. Plants grown at root zone cooling at 15 and 20 °C treatments produced lower number of tubers and lower tuber weight than at 10 oC, while plants grown at greenhouse temperature did not produce tubers.Keywords: cultivation techniques, Granola, high temperature, lowland tropical, potato tuber
ERROR ANALYSIS ON THE ESTIMATION OF CUMULATIVE INFILTRATION SOIL USING GREEN AND AMPT MODEL Askari, Muhamad; Saptomo, Satyanto Krido; Setiawan, Budi Indra
Jurnal Keteknikan Pertanian Vol 20, No 2 (2006): Jurnal Keteknikan Pertanian
Publisher : PERTETA

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Abstract

ABSTRACT Green and Ampt infiltration model is still useful for the infiltration process because of a clear physical basis of the model and of the existence of the model parameter values for a wide range of soil.  The objective of thise study was to analyze error on the esimation of cumulative infiltration in sooil using Green and Ampt model and to design laboratory experiment in measuring cumulative infiltration. Parameter of the model was determined based on soil physical properties from laboratory experiment. Newton –Raphson method was esed to estimate wetting front during calculation using visual Basic for Application (VBA) in MS Word. The result showed that Dq contributed the highest error in estimation of cumulative infiltration and was followed by K, H0, H1, and t respectively. It also showed that the calculated cumulative infiltration is always lower than both measured cumulative infiltration and volumetric soil water content. Keyword: Green and Ampt, cumulative infiltration, wetting front, VB Application.
ALGORITMA FILTER KALMAN UNTUK MENGHALUSKAN DATA PENGUKURAN ., Rudiyanto; Setiawan, Budi Indra; Saptomo, Satyanto Krido
Jurnal Keteknikan Pertanian Vol 20, No 3 (2006): Jurnal Keteknikan Pertanian
Publisher : PERTETA

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ABSTRACT The objective of this paper is to apply a simple algorithm of Kalman Filter, wich is know as noise data filtering. The computer program was written in Macro Visual Basic in MS Exel. Testings were carried out on available temperature, Water level and force data and then were comared with the mooving average method. The result shows that the algorithm performed better and lesser deviation than the mooving average. Keyword: Kalman Filter, mesurement data, computer program Diterima: 30 Oktober 2006; Disetujui: 14 Nopember 2006
Aplikasi Zone Cooling pada Sistem Aeroponik Kentang Di Dataran Medium Tropika Basah Sumarni, Eni; Sumartono, G. H.; Saptomo, Satyanto Krido
Jurnal Keteknikan Pertanian Vol 1, No 1 (2013): JURNAL KETEKNIKAN PERTANIAN
Publisher : PERTETA

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AbstractSupplies of seed potatoes in Central Java is more than 12,000 tons per year, but that can be provided only about 300 tons. From this condition, there is a large market opportunity for the provision of seed potatoes. Highland for planting potatoes in Indonesia is still limited. Therefore, the cultivation of the potato in the plains of the medium is one of the efforts to help the production of seed. The high temperature in the plains of the medium can be resolved through aeroponics system with limited cooling (zone cooling). The purpose of this study is to obtain an appropriate cooling temperature on seed potato production in medium land. Aeroponic cultivation techniques used with 3 zone cooling (15 °C, 19 °C and 24 °C) and controls. Potato varieties used in this study is Granola is from tissue culture .The results showed that the highest plant cooling obtained at day and night regions 19 °C and 24 °C at night. The highest number of leaves was obtained at 24 °C day and night. The highest number of tubers obtained at 19 °C day and night.Keywords : aeroponics, medium wet tropical climates, potato, seed, , zone coolingAbstrakKebutuhan benih kentang di Jawa Tengah lebih dari 12.000 ton per tahun, tapi baru dapat dipenuhi sekitar 300 ton. Dari kondisi ini, ada peluang pasar yang besar untuk penyediaan bibit kentang. Dataran tinggi untuk menanam kentang di Indonesia masih terbatas. Oleh karena itu, budidaya kentang di dataran medium adalah salah satu upaya untuk membantu produksi benih. Suhu tinggi di dataran medium dapat diselesaikan melalui sistem aeroponik dengan pendingin terbatas (zone cooling). Tujuan dari penelitian ini adalah untuk mendapatkan suhu pendingin yang sesuai pada produksi benih kentang secara aeroponik didataran medium. Teknik budidaya aeroponik menggunakan 3 zona pendinginan (15 oC, 19 oC dan 24 oC) dan kontrol. Varietas kentang yang digunakan dalam penelitian ini adalah Granola dari kultur jaringan. Hasilpenelitian menunjukkan bahwa tinggi tanaman tertinggi diperoleh pada pendinginan siang dan malam suhu 19 °C dan pendinginan 24 °C di malam hari. Jumlah daun tertinggi diperoleh pada suhu 24 °C siang danmalam. Jumlah umbi tertinggi diperoleh pada suhu 19 °C siang dan malam.Kata kunci: aeroponik, benih kentang, dataran medium tropika basah, zone coolingDiterima: 01 Maret 2013; Disetujui: 03 Juni 2013
Sistem Kontrol Irigasi PID ., Wiranto; Setiawan, Budi Indra; Saptomo, Satyanto Krido
Jurnal Keteknikan Pertanian Vol 2, No 2 (2014): JURNAL KETEKNIKAN PERTANIAN
Publisher : PERTETA

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AbstractIrrigation application on agriculture is used to fulfill plant water requirement. In its application, irrigation water should be used optimally. However in the field, irrigation activities are generally wasteful practicesthat may impact on the increasing cost for water requirement. Under these conditions automatic irrigation system which could provide water with expected conditions for the plants, are needed, especially for largearea where the use of wireless automatic irrigation system is applicable. The advantages of the automatic system among others are the data could easily be downloaded and the devices could be easily installed. If it is installed properly, the system could facilitate the monitoring of irrigation in the region. In this study, PID model (Proportional, Integral and Derivative) is used for irrigation control systems and sensor connection with the logger (ATMega328 microcontroller). The objectives of this study is to improve irrigation efficiency by providing irrigation water required using control irrigation systems. The benefits of this approach is to provide an alternative method of automatic irrigation system for areas with limited water supply because this system is able to distribute the amount of irrigation water according to crop requirement.Keywords: automatic irrigation, control system, PIDAbstrakPemberian air irigasi pada lahan pertanian bertujuan untuk memenuhi kebutuhan air tanaman. Dalam pemanfaatannya, air irigasi harus digunakan secara optimum. Namun pada kenyataannya kegiatan irigasi memberikan dampak boros air sehingga berdampak pada meningkatnya kebutuhan ekonomi untuk memenuhi kebutuhan air tanaman. Dengan kondisi tersebut, perlu dibuat suatu sistem irigasi otomatis yang mampu menyediakan air untuk tanaman dengan kondisi yang diharapkan, untuk area yang luas menggunakan system irigasi otomatis nirkabel. Kelebihan dari sistem ini diantaranya data mudah didownload dan perangkat mudah diinstalasi sehingga dapat memudahkan dalam monitoring seluruh kawasan irigasi. Pada penelitian ini digunakan model PID (Proportional, Integral and Derivative) dalam sistem kendali irigasi dan koneksi sensor dengan logger (mikrokontroler ATMega328) menggunakan sistem nirkabel (wireless) dengan memanfaatkan perangkat Xbee/xbee Pro. Metode penelitian dengan menggunakan simulasi PID diaplikasikan pada prototipe irigasi tanah perlakuan. Tujuan dilakukannya penelitian ini adalah meningkatkan efisiensi dan mengetahui jumlah air irigasi yang diperlukan dengan sistem irigasi kontrol nirkabel (wireless). Manfaat dari penelitian ini sendiri adalah memberikan alternatife sistem irigasi otomatis untuk kawasan dengan ketersediaan air terbatas karena sistem ini mampu mengatur pemberiaan air irigasi sesuai dengan kebutuhan tanaman (efisiensi terhadap penggunaan air irigasi).Kata kunci: irigasi otomatis, PID, sistem kontrolDiterima: 02 April 2014 ;Disetujui :28 Juli 2014
Pengembangan Konsep Zero Runoff System (ZROS) untuk Optimalisasi Kadar Air Tanah pada Lahan Perkebunan Non Irigasi Wirasembada, Yanuar Chandra; Setiawan, Budi Indra; Saptomo, Satyanto Krido
Jurnal Keteknikan Pertanian Vol 2, No 2 (2014): JURNAL KETEKNIKAN PERTANIAN
Publisher : PERTETA

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AbstractOn non-irrigated farming land, soil water content was difficult to be maintained in field capacity condition. Zero runoff system (ZROS) attempted to utilize runoff and to convert it to backup soil water content using permeation structures. The objectives of this research was to analyze the changing of soil water content before and after ZROS had been applied and to calculate ZROS effectivity towards infiltrating rainfall. In this research, permeation structures in the research field was usingsilt pit and collector canal. The changing of soil water content before and after ZROS application was calculated by water balance model in therooting zone. The simulation result showed that after ZROS had been applied, the decreasing of soil water content in research field were ranging from -0.001 to -0.009 m3/m3, while before ZROS had been appliedit were ranging from -0.01 to -0.024 m3/m3. Besides that, ZROS also capable to increase soil water content in research field for 25.57%. The increasing of this soil water content was caused by ZROS ability that canhold and infiltrate 51.04% from total rainfall occurredeffectively.Keywords: permeation structure, runoff, soil water content, water balance model, zero runoff systemAbstrakPada lahan non irigasi, kadar air tanah sulit dipertahankan pada kondisi kapasitas lapang dan sangat tergantung pada curah hujan. Zero runoff system (ZROS) berupaya memanfaatkan limpasan permukaan dan mengkonversinya menjadi cadangan air tanahdengan menggunakan bangunan resapan. Penelitian ini bertujuan menganalisis perubahan kadar air tanah sebelum dan sesudah penerapan ZROS serta menghitung efektifitas ZROS dalam meresapkan air hujan. Pada penelitian ini, bangunan resapan yang digunakan berupa rorak dan saluran pengumpul. Perubahan kadar air tanah yang terjadi sebelum dan sesudah diterapkan ZROS dihitung menggunakan model kesetimbangan air di dalam zona perakaran tanaman. Hasil simulasi menunjukkan bahwa setelah diterapkan ZROS, penurunan perubahan kadar air tanah berada pada kisaran -0.001 sampai -0.009 m3/m3 sedangkan sebelum ZROS sebesar -0.01 sampai -0.024 m3/m3. Selain itu, ZROS juga mampu meningkatkan kadar air tanah di lokasi penelitian sebesar 25.57%. Kenaikan kadar air tanah ini disebabkan oleh kemampuan ZROS yang secara efektif menampung dan meresapakan 51.04% dari curah hujan yang terjadi selama periode pengukuranKata Kunci : bangunan resapan, kadar air tanah, limpasan permukaan, model kesetimbangan air, zero runoff system.Diterima: 07 Mei 2014; Disetujui: 19 Agustus 2014
ALGORITMA FILTER KALMAN UNTUK MENGHALUSKAN DATA PENGUKURAN ., Rudiyanto; Setiawan, Budi Indra; Saptomo, Satyanto Krido
Jurnal Keteknikan Pertanian Vol 20, No 3 (2006): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

ABSTRACT The objective of this paper is to apply a simple algorithm of Kalman Filter, wich is know as noise data filtering. The computer program was written in Macro Visual Basic in MS Exel. Testings were carried out on available temperature, Water level and force data and then were comared with the mooving average method. The result shows that the algorithm performed better and lesser deviation than the mooving average. Keyword: Kalman Filter, mesurement data, computer program Diterima: 30 Oktober 2006; Disetujui: 14 Nopember 2006
ERROR ANALYSIS ON THE ESTIMATION OF CUMULATIVE INFILTRATION SOIL USING GREEN AND AMPT MODEL Askari, Muhamad; Saptomo, Satyanto Krido; Setiawan, Budi Indra
Jurnal Keteknikan Pertanian Vol 20, No 2 (2006): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

ABSTRACT Green and Ampt infiltration model is still useful for the infiltration process because of a clear physical basis of the model and of the existence of the model parameter values for a wide range of soil.  The objective of thise study was to analyze error on the esimation of cumulative infiltration in sooil using Green and Ampt model and to design laboratory experiment in measuring cumulative infiltration. Parameter of the model was determined based on soil physical properties from laboratory experiment. Newton –Raphson method was esed to estimate wetting front during calculation using visual Basic for Application (VBA) in MS Word. The result showed that Dq contributed the highest error in estimation of cumulative infiltration and was followed by K, H0, H1, and t respectively. It also showed that the calculated cumulative infiltration is always lower than both measured cumulative infiltration and volumetric soil water content. Keyword: Green and Ampt, cumulative infiltration, wetting front, VB Application.