Articles
<![CDATA[Desain dan Uji Kinerja Fungsional Sistem Penggerak dan Kendali ROVERGARD ]]>
<![CDATA[Moh Fikri Pomalingo]]>;
<![CDATA[Radite Praeko Agus Setiawan]]>;
<![CDATA[I Dewa Made Subrata]]>
<![CDATA[ Jurnal Keteknikan Pertanian Vol. 5 No. 1 (2017): JURNAL KETEKNIKAN PERTANIAN ]]>
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DOI: 10.19028/jtep.05.1.%p
<![CDATA[AbstractThe high population rate has an impact on increasing of land function change from agricultural land become housing and commercial building. As a result, it is difficult to get land for planting in the urban area. Therefore, this research is aimed to design equipment that can be used for planting in the narrowland using vertical gardening. This paper will report about design and functional testing of drive and control system on ROVERGARD. Drive system is based on water pump with additional gear train and chainsprocket mechanism. Control system use was on open loop type based on timer. The performance test of drive system was focused on electrical energy consumption and rotational speed of the system that was measured by multifunctional mini ammeter and tachometer. The control system was tested during 4 days,to evaluate their performances between set point and actual timing while filling water tank and rotate the system at maximal load condition. Electrical power consumption was 208 W at average rotational speed 2703 rpm. Increasing load caused an increase of energy consumption but made the drive rotation decline. The position control performance had on position error around 50 cm. Consequently, setting time on timer must be adjusted.AbstrakLaju pertumbuhan penduduk yang tinggi, mengakibatkan tingginya alih fungsi lahan pertanian menjadi bangunan perumahan dan komersial. Masalah ini mengakibatkan sulitnya mencari lahan pertanian di daerah padat penduduk khususnya perkotaan. Oleh karena itu perlu dirancang sebuah alat yang dapat digunakan untuk bercocok tanam di lahan sempit. Tujuan dari penelitian ini adalah mendesain dan menguji sistem penggerak dan kendali pada ROVERGARD. Sistem penggerak berasal dari pompa air yang dimodifikasi. Sedangkan sistem kendali menggunakan tipe open loop berbasis waktu dimana timer sebagai komponen utamanya. Pengujian kinerja penggerak difokuskan pada konsumsi listrik dan rpmyang diukur menggunakan multifunctional mini ammeter dan tachometer. Sistem kendali diuji selama 4 hari. Hasil pengujian kinerja penggerak menunjukkan bahwa pada kondisi pengisian penampung dan beban maksimal. Daya listrik yang dihasilkan adalah 208 W dimana putaran penggerak adalah 2703 rpm.Penambahan beban pada pot berbanding lurus dengan konsumsi listrik yang dihasilkan, namun berbandingterbalik dengan putaran penggerak. Sementara itu, kinerja sistem kendali belum maksimal, karena masihterdapat kesalahan posisi yang mencapai 50 cm, karenanya pengaturan waktu pada timer harus diperbaiki]]>
<![CDATA[Kinerja Traksi Roda Ramping Bersirip pada Berbagai Kombinasi Jumlah dan Sudut Sirip di Tanah Sawah Berlumpur ]]>
<![CDATA[Ubaidillah .]]>;
<![CDATA[Wawan Hermawan]]>;
<![CDATA[Radite Praeko Agus Setiawan]]>
<![CDATA[ Jurnal Keteknikan Pertanian Vol. 5 No. 1 (2017): JURNAL KETEKNIKAN PERTANIAN ]]>
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DOI: 10.19028/jtep.05.1.%p
<![CDATA[AbstractThe lugged wheel as tractive tools in Indonesian agriculture mainly used for land preparation, i.e. hand tractor operations. There are basic needs to develop narrow lugged wheel designed for post-planting application that has ability for inter-row paddy field operation. The aim of present study was to determine tractive performance of narrow lugged wheel. The tested wheel has 85.5 cm of outer diameter and 14 ×8 cm of lug dimension, with three combinations of each lug spacing and lug angle. The experiment was conducted on an actual paddy field and some tractive performances were determined. The results indicate that tractive power output reached a peak at about 12 – 30 % of wheel slip, depending on the lug angle and lug spacing. The lugged wheel with 30o lug angle and 30o lug spacing showed higher tractive powercompared to other combinations. The tractive power output and tractive efficiencies of narrow lugged wheel were lower than that of the conventional wheel. The average wheel slip at the peak tractive efficiency was ranged 13 – 23 %, depending on the lug angle and lug spacing. Based on the performance, the narrow lugged wheel with 30o lug angle and 30o lug spacing is recommended for further development of narrow lugged wheel.AbstrakRoda besi bersirip sebagai komponen penghasil traksi pada pertanian di Indonesia utamanya digunakan pada kegiatan penyiapan lahan. Muncul kebutuhan mendasar untuk mengembangkan roda besi bersirip ramping yang dirancang untuk diaplikasikan pada kegiatan pasca-tanam yang memiliki kemampuan beroperasi di sela alur tanaman padi. Tujuan dari penelitian ini adalah menentukan performansi traksi dariroda bersirip ramping untuk beroperasi di sela alur tanaman padi. Roda berdiameter luar 85.5 cm dan berdimensi sirip 14×8 cm, dengan tiga kombinasi pada masing-masing jarak antar sirip dan sudut sirip. Penelitian dilakukan secara aktual di lahan berlumpur dengan beberapa parameter performasi traksi yangdiamati. Hasil pengujian mengindikasikan daya tarik maksimum diperoleh pada rentang slip roda 12 – 30 %, bergantung sudut dan jarak sirip yang digunakan. Roda bersirip dengan sudut sirip 30o dan jarak antar sirip 30o menunjukkan tenaga tarik lebih besar dibandingkan dengan kombinasi lainnya. Daya tarik dan effisiensi traksi dari roda bersirip ramping lebih kecil dibandingkan dengan roda sangkar konvensional. Nilai rataan slip roda pada effisiensi traksi maksimum berkisar pada 13 – 23 %, bergantung sudut dan jarak sirip yang digunakan. Berdasarkan parameter performansi traksi, roda bersirip ramping dengan sudut sirip 30o dan jarak antar sirip 30o direkomendasikan untuk pengembangan lanjutan dari roda bersirip ramping.]]>
<![CDATA[Penalaan PID Menggunakan Internal Model Controller dengan Pendekatan Model Tustin ]]>
<![CDATA[Abdul Azis]]>;
<![CDATA[Radite Praeko Agus Setiawan]]>;
<![CDATA[Wawan Hermawan]]>;
<![CDATA[Tineke Mandang]]>
<![CDATA[ Jurnal Keteknikan Pertanian Vol. 6 No. 1 (2018): JURNAL KETEKNIKAN PERTANIAN ]]>
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DOI: 10.19028/jtep.06.1.45-52
<![CDATA[AbstrackPID control is a popular controlling technique in high accuracy control system. PID tuning is a very important stage and affects the reliability of the PID control system. This stage plays a role in determining KP,KI, and KD constants. Currently it has been a lot of PID tuning techniques that have been developed from the Ziegler-Nichols methods. PID Tuning using Internal Model Controller (IMC) by Tustin discrete approached models was used in this study. Open-loop method was used with two variation value of PWM (20% and 80%). The purposes of this study were to determine the PID constants and test those performances using a DC motor. The result of PID tuning process generated two pairs of KP, KI, and KD constants. The first were 0.4013; 0.0988; 0.0176, and the second were 0.2314; 0.0531; 0.044, respectively. The testing results with DC motor showed the performance of the both pairs of PID constants obtained were reliable enough to control motor speed that was characterized by the ability to follow the set-point value that was given and there was no steady state error. There was oscillation at 1500 rpm and 2000 rpm and motor power couldn’t achieve the set-point at 2000 rpm.AbstrakKontrol PID merupakan salah satu teknik pengontrolan yang populer untuk pengontrolan sistem dengan ketelitian tinggi. Terdapat satu tahapan yang sangat penting dan mempengaruhi kehandalan dari sistemkontrol PID yang dihasilkan. Tahapan tersebut adalah penalaan (tuning) PID. Tahapan ini menjadi penting karena berperan dalam penentuan konstanta PID (KP, KI, dan KD). Saat ini telah banyak teknik penalaanPID yang telah dikembangkan dari teknik Ziegler-Nichols. Penalaan PID dengan teknik Internal Model Controller (IMC) melalui pendekatan model discrete Tustin digunakan dalam penelitian ini. Metode openloopdengan teknik pengontrolan PWM dipakai dengan dua variasi nilai PWM yaitu 20% dan 80%. Tujuan penelitian ini adalah menemukan konstanta PID dan menguji performanya dengan motor DC. Dari proses penalaan PID yang dilakukan, diperoleh dua pasang konstanta KP, KI, dan KD. Konstanta pertama masingmasing sebesar 0.4013; 0.0988; dan 0.0176, dan pasangan kedua masing-masing sebesar 0.2314; 0.0531; dan 0.044. Hasil pengujian dengan motor DC memperlihatkan performa konstanta PID yang diperoleh cukup handal dalam mengontrol kecepatan motor yang ditandai oleh kemampuan motor dalam mengikuti nilai set-point yang diberikan dan tidak terjadi steady state error. Akan tetapi terjadi osilasi pada set-point 1500 rpm dan 2000 rpm dan kekuatan motor tidak dapat mencapai set-point 2000 rpm.]]>
<![CDATA[Kajian Efek Medan Elektromagnet terhadap Karakteristik Semburan Bahan Bakar Solar, Biodiesel dan Campuran Keduanya ]]>
<![CDATA[Tatun Hayatun Nufus]]>;
<![CDATA[Wawan Hermawan]]>;
<![CDATA[Radite Praeko Agus Setiawan]]>;
<![CDATA[Armansyah Halomoan Tambunan]]>
<![CDATA[ Jurnal Keteknikan Pertanian Vol. 6 No. 1 (2018): JURNAL KETEKNIKAN PERTANIAN ]]>
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DOI: 10.19028/jtep.06.1.99-106
<![CDATA[AbstractResearch on optimization of diesel engine fuel have been conducted, among other, by utilizing the electromagnetic field. To prove that by using the electromagnetic field of the combustion process to be optimal among them is to analyze the character of atomization. The purpose of this research was to analyzethe effect of fuel magnetization on the fuel spray pattern. Experiments were conducted using several fuel including diesel fuel, mixtures of diesel fuel and biodiesel of 10%, 40%, 70%, and biodiesel. Before the spraying test, the fuel was exposed to strong electromagnetic field with variation of wound coil 5000-9000 winding (876-1300 Gauss) for 5 minutes. The spraying test used an injector tester at a pressure of 14.7 Mpa. The spray was observed using a high-speed camera. It was appeared that the larger magnetic field applied to the fuel caused the viscosity to fall in the range of 5-15%, increasing the angle of the sprays or widespread area of the bursts in the range of 3.5-12%, and the particle size of the bursts becomes smaller by 0.2916-0.975 nm. This information is considered to be useful for further research in order to resolutely clarify the phenomenon of efficient combustion process of fuel after exposure to magnetic field.AbstrakBerbagai penelitian tentang pengoptimalisasian bahan bakar motor diesel telah banyak dilakukan, salah satunya dengan memanfaatkan medan elektromagnet. Untuk membuktikan bahwa dengan menggunakan medan elektromagnet proses pembakaran menjadi optimal diantaranya adalah dengan menganalisis karakter semburan bahan bakar. Tujuan penelitian ini adalah menganalisis efek magnetisasi bahan bakar terhadap pola semburan bahan bakar. Bahan bakar yang digunakan adalah solar, B10, B40, B70, dan biodiesel. Bahan bakar yang dicoba diberi paparan kuat medan elektromagnet dengan variasi jumlah lilitan kawat 5000-9000 lilitan 836.45 - 1353 Gauss selama 5 menit (300 detik) dan dilanjutkandengan proses penyemprotan melalui alat injector tester pada tekanan 14.7 Mpa. Hasilnya diamati dengan kamera kecepatan tinggi. Tampak bahwa makin besar medan magnet yang diberikan pada bahan bakarmenyebabkan viskositas turun pada kisaran 5-15%, meningkatkan sudut semburan atau luas daerah semburan menjadi lebih besar berkisar 3.5-12%, dan ukuran partikel semburan menjadi lebih kecil sebesar0.2916-0.975 nm. Informasi ini berguna untuk penelitian lebih lanjut agar secara jelas dapat mengklarifikasi fenomena magnetisasi bahan bakar terhadap proses pembakaran yang efisien.]]>
<![CDATA[Pengembangan Prototipe Dan Pengujian Traktor Satu Roda Untuk Pemeliharaan Tanaman Padi ]]>
<![CDATA[Jusran Jusran]]>;
<![CDATA[Radite Praeko Agus Setiawan]]>;
<![CDATA[I Dewa Made Subrata]]>
<![CDATA[ Jurnal Keteknikan Pertanian Vol. 7 No. 2 (2019): JURNAL KETEKNIKAN PERTANIAN ]]>
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DOI: 10.19028/jtep.07.2.147-154
<![CDATA[Most of paddy fields in Indonesia are not consolidated, therefore, soil hardpan usually did not exist. With no soil hardpan, mobility of any machine for crop maintenance is very difficult even in some places is almost impossible.Until now crop maintenance such as weeding, spraying and spreading fertilizer was done manually by labor. Then mechanization is required to replace the labour which is not available or very expensive. Hence, this study conducted with objective to make a prototype II of a single wheel tractor for crop maintenance operated in deep mud field or in an unconsolidated paddy field. The study also did performance test of a single wheel tractor to measure the tractor speed, traction, sinkage, and slip of wheel when operated in rice plants field. The results of performance test showed that the speed average of wheel with straight lug and curved lug were 1.15km/hour and 0.97 km/hour. The average of sinkage and slip both of wheels with straight lug and curved lug respectively were 24.8 cm, 25.9 cm and 38.7 %, 26.12%. The results of performance test olso showed that the traction average of wheel with straight lug and curved lug respectively were 45.8 kg and 41.5 kg]]>
<![CDATA[Desain dan Kinerja Mesin Pemupuk Tipe Auger Bertenaga Traktor Tangan untuk Tanaman Kedelai ]]>
<![CDATA[Diang Sagita]]>;
<![CDATA[Wawan Hermawan]]>;
<![CDATA[Radite Praeko Agus Setiawan]]>
<![CDATA[ Jurnal Keteknikan Pertanian Vol. 6 No. 2 (2018): JURNAL KETEKNIKAN PERTANIAN ]]>
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DOI: 10.19028/jtep.06.2.187-194
<![CDATA[AbstractThe prototype of auger type fertilizer applicator powered by hand tractor has been developed. It was constructed for four planting rows of soybean in one pass. The four fertilizer applicator units were rotated by utilizing the tractor wheel axle rotation. The auger of the metering device was divided into 3 sections of auger pitch (15, 20 and 25 mm) due to the applicator could be changed the application rate. Each auger pitch represented application rate about 150 kg/ha (6 g/m), 200 kg/ha (8 g/m) and 250 kg/ha (10 g/m) respectively. The objective of this study was to develop and to conduct performance test of auger type fertilizer applicator for four planting rows of soybean that could be changed the dose. The result of stationary tests shows that the average dose for each pitch were 7.42, 9.58 and 11.60 g/auger rotation respectively at 1800 rpm (18 rpm auger) engine speed and 7.88, 9.53 and 11.49 g/auger rotation resvectively at 2000 rpm (20 rpm auger). The field test showed the result for each auger pitch were 5.91, 8.46 and 10.08 g/m respectively. These results indicated that the applicator was able to allocate fertilizer evenly with high accuracy (the error was less than 8%). The field test showed that effective field capacity was 0.137 ha/hour and efficiency was 73.7%.AbstrakPrototipe unit pemupuk tipe auger bertenaga traktor tangan untuk tanaman kedelai telah berhasil dikembangkan. Prototipe ini dibuat untuk pemupukan empat alur tanam dalam satu lintasan. Empat unit penjatah pupuk digerakkan dengan memanfaatkan putaran dari poros roda traktor. Poros auger dari metering device pupuk dibagi menjadi 3 ukuran jarak pitch yaitu 15, 20 dan 25 mm agar dosis pupuk dapatdiatur. Setiap jarak pitch auger mewakili dosis pemupukan berturut-turut 150 kg/ha (6 g/m), 200 kg/ha (8g/m), and 250 kg/ha (10 g/m). Tujuan dari penelitian ini adalah untuk mengembangkan dan menguji kinerja dari unit pemupuk kedelai empat alur tanam yang dapat diubah dosis pemupukannya. Hasil pengujian stasioner menunjukkan nilai penjatahan pupuk untuk tiap pitch berturut-turut adalah 7.42, 9.58 and 11.60 g/putaran auger saat pengujian dengan kecepatan putar engine 1800 rpm (18 rpm auger) dan 7.88, 9.53 and 11.49 g/putaran auger saat diuji pada 2000 rpm (20 rpm auger). Sementara pengujian di lahan berturutturut untuk setiap pitch adalah 5.91, 8.46 dan 10.08 g/m. Hasil tersebut menunjukkan bahwa unit pemupuktelah mampu menjatah pupuk secara merata dengan tingkat akurasi yang tinggi (error kurang dari 8%).Kapasitas lapangan efektif mesin mencapai 0.137 ha/jam dan efisiensi lapangan sebesar 73.7%.]]>
<![CDATA[Evaluasi Konsep Desain dan Kinerja Ditcher untuk Pembuatan Parit pada Budidaya Kedelai ]]>
<![CDATA[Azmi Asyidda Mushoffa]]>;
<![CDATA[Wawan Hermawan]]>;
<![CDATA[Radite Praeko Agus Setiawan]]>
<![CDATA[ Jurnal Keteknikan Pertanian Vol. 6 No. 2 (2018): JURNAL KETEKNIKAN PERTANIAN ]]>
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DOI: 10.19028/jtep.06.2.157-164
<![CDATA[AbstractThe purpose of this study was to evaluate the design concept and performance of the ditcher that has been designed for soybean cultivation on saturated soil culture. The design concept evaluation was done by experiment on 3 types of prototype ditcher to determine one of the best ditcher design concept. It was selected by a technique weighted performance method. The performance test on the best ditcher prototype was carried out in a field with silty loam soil at average moisture content 65.4% (dry basis) and 470 kPa average cone index. The last crop in the field was rice. The plastic limit and plasticity index of the soil were 34.05% and 19.80% respectively. Depths of operation considered were 20 cm. Tests were conducted at average forward speeds of 0.51 m/s resulting 28.7% average wheel slip. Theoretical field capacity was 0.74 ha/h. The average width and depth of the ditch that was formed were 32.6 cm and 18.3 cm respectively. The soil disturbance created as a result was also reported.AbstrakTujuan penelitian ini adalah mengevaluasi konsep desain dan kinerja ditcher untuk pembuatan parit pada budidaya kedelai jenuh air. Evaluasi konsep desain dilakukan dengan percobaaan pada 3 jenis prototipe ditcher untuk menentukan satu konsep desain ditcher terbaik. Desain terbaik dipilih dengan metode indeks kinerja berbobot. Uji kinerja prototipe ditcher terbaik dilakukan di lahan sawah bekas panen padi dengankelas tekstur tanah liat berdebu, kadar air rata-rata 65.4% (basis kering) dan tahanan penetrasi rata-rata 470 kPa. Batas plastis dan indeks plastisitas tanah masing-masing adalah 34.05% and 19.80%. Kedalaman operasi dipertahankan pada 20 cm. Slip roda traksi rata-rata yang terjadi 28.7% dengan kecepatan maju rata-rata 0.51 m/s. Kapasitas lapangan teoritis diperoleh 0.74 ha/jam. Lebar dan kedalaman parit yangterbentuk adalah 32.6 cm dan 18.3 cm. Parameter tanah terusik sebagai pengaruh operasi ditcher juga dilaporkan di dalam hasil penelitian ini.]]>
<![CDATA[Pengaruh Receiver Terhadap Kinerja Refrigerasi Mesin Pembeku ]]>
<![CDATA[Paulus Sukusno]]>;
<![CDATA[Armansyah H. Tambunan]]>;
<![CDATA[Radite Praeko Agus Setiawan]]>;
<![CDATA[Yohanes Aris Purwanto]]>
<![CDATA[ Jurnal Keteknikan Pertanian Vol. 6 No. 3 (2018): JURNAL KETEKNIKAN PERTANIAN ]]>
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DOI: 10.19028/jtep.06.3.343-350
<![CDATA[AbstractFreezing is the best method to preserve the quality of food for a long period of time compared to other technologies such as drying and canning. Technology of freezing requires more energy than other preservation technologies, however. Therefore, an energy efficient freezer is needed. This research aims to the effect of utilization of a receiver to improve the freezer performance efficency. The research is conducted on freezer used to cool and freeze 1 kg of water from a temperature of 27oC to -14oC, then a receiver is installed in the freezer and the same research is conducted (the type and setting of expansion valve and test materials are the same). The refrigerant medium is R404A working fluid. The receiver is installed between condenser and filter dryer in the system circuit of the freezer. The result shows that the utilization of receiver increases the coefficent of performance (COP) from 2.24 to 2.69 and reduce the electricity consumption. The time required for freezing becomes shorter particularly on the transition of liquid to solid phase (ice) . Consequently, the freezing rate becomes quicker and provides advantages for application of food freezing.AbstrakPembekuan merupakan metode yang paling baik untuk menjaga kualitas makanan dalam jangka waktu lama, dibanding dengan teknologi lain seperti pengeringan dan pengalengan. Namun teknologi pembekuan membutuhkan lebih banyak energi daripada teknologi pengawetan lainnya, karena itu diperlukan mesin pembeku yang hemat energi. Penelitian ini bertujuan untuk mempelajari pengaruh penggunaan receiver untuk meningkatkan efisiensi kinerja mesin pembeku. Penelitian dilakukan pada mesin pembeku yang digunakan untuk mendinginkan dan membekukan air 1 kg dari suhu 27oC sampai -14oC, selanjutnya penelitian mesin pembeku ditambahkan receiver dan dilakukan penelitian yang sama (bukaan katup ekpansi diatur tetap dan sama, serta bahan uji dilakukan dalam kondisi sama). Media pendingin menggunakan fluida kerja R404A. Receiver diletakkan di antara kondensor dan filter dryer pada rangkaian sistem mesin pembeku. Hasil penelitian menunjukkan bahwa penggunaan receiver pada mesin pembeku berdampak pada peningkataan koefisien kinerja (COP) dari 2.24 menjadi 2.69, dan terjadi penghematan konsumsi energi listrik. Waktu proses pembekuan menjadi lebih singkat, khususnya pada tahap perubahan fase cair menjadi es, sehingga laju pembekuan menjadi lebih cepat dan memberi keuntungan untuk penerapan pada pembekuan bahan pangan.]]>
<![CDATA[Rancang Bangun dan Pengujian Penetrometer Digital dengan Perekam Data Berbasis Android ]]>
<![CDATA[Budi Priyonggo]]>;
<![CDATA[I Dewa Made Subrata]]>;
<![CDATA[Radite Praeko Agus Setiawan]]>
<![CDATA[ Jurnal Keteknikan Pertanian Vol. 7 No. 1 (2019): JURNAL KETEKNIKAN PERTANIAN ]]>
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DOI: 10.19028/jtep.07.1.83-90
<![CDATA[Abstract Static penetrometer is designed to measure the force that required to push a conical probe of the soil deepness through a constant velocity. The output data are force per unit area without soil factor influenced, i.e. soil moisture content. Soil moisture content is an important factor that affects soil penetration resistance. The soil moisture content method that commonly uses a gravimetric method can takes a long time to obtain data of soil moisture conten. Therefore a penetrometer is needed which can measure the soil moisture content at once. The objective of study is to design and develop static penetrometer equipped with soil moisture sensor and android based data record system. Loadcell and HX711 used as force sensor, HC-SR04 and DHT11 used as depth sensor and a kit soil moisture module has been modified as soil moisture sensor. Calibration and validation result of the sensor shown that the correlation value of R2=0.9994 and R2=0.9995 (force sensor), R2=0.9999 and R2=0.9999 (depth sensor) and R2= 0.9098 and R2=0.9255 (soil moisture sensor). Penetrometer performance test in land result obtained the value of R2=0.9583 for cone index, R2=0.9994 for depth sensor dan R2=0.6673 moisture content sensor. Penetrometer pervormance test in rice field result obtained the value of R2=0.9583 for cone index, R2=0.9941 for depth sensor and R2=0.7201 moisture content sensor. The result of regression anlaysis for moisture content equation obtained value R2=0.7201 for testing on dry land and R2=0.9058 for testing in the paddy fields. The experimental result shown that the new develop penetrometer instrument can be used as an alternative instrument to measure soil pentration that eqquiped with soil moisture content data.AbstrakPenetrometer statis didesain untuk mengukur gaya yang dibutuhkan untuk menekan probe kerucut kedalaman tanah dengan kecepatan konstan. Output datanya adalah gaya persatuan luas tanpa faktor sifat tanah lain seperti kadar air. Kadar air tanah merupakan faktor penting yang memengaruhi tahanan penetrasi tanah. Metode pengukuran kadar air yang umum menggunakan metode gravimetri yang membutuhkan waktu cukup lama untuk mendapatkan data kadar air tanah. Maka dari itu dibutuhkan penetrometer yang dapat sekaligus mengukur kadar air dengan baik. Tujuan dari penelitian ini adalah merancang, membangun dan menguji penetrometer digital dilengkapi pembacaan kadar air dengan perekam data berbasis android. Loadcell dan HX711 digunakan sebagai sensor gaya, HC-SR04 dan DHT11 digunakan sebagai sensor kedalaman dan kit sensor kadar air tanah termodifikasi digunakan sebagai sensor kadar air. Hasil kalibrasi dan validasi sensor didapatkan nilai R2=0.9994 dan R2=0.9995 untuk sensor gaya, R2=0.9999 dan R2=0.9999 untuk sensor kedalaman, R2=0.9098 dan R2=0.9255 untuk sensor kadar air tanah. Hasil pengujian kinerja di lahan kering secara terpadu di dapatkan nilai nilai R2=0.9583 untuk cone index, R2=0.9994 untuk sensor kedalaman dan R2=0.6673 untuk sensor kadar air. Hasil pengujian di lahan sawah didapatkan nilai R2=0.9583 untuk sensor gaya, R2=0.9941 untuk sensor kedalaman dan R2=0.7696 untuk sensor kadar air. Hasil analisis regresi pada proses kalibrasi ulang didapat persamaan penduga kadar air dengan nilai R2=0.7201 untuk pengujian di lahan kering dan R2=0.9058 untuk pengujian di lahan sawah. Berdasarkan data yang didapatkan maka penetrometer yang dirancang dapat digunakan sebagai alternatif instrumen ukur tahanan penetrasi yang dilengkapi dengan data kadar air. ]]>
<![CDATA[Statistical Analysis of Effect of pH Treatment on Biohydrogen Production from POME Waste ]]>
<![CDATA[Junita Tarigan]]>;
<![CDATA[Armansyah Halomoan Tambunan]]>;
<![CDATA[Radite Praeko Agus Setiawan]]>;
<![CDATA[Obie Farobie]]>;
<![CDATA[Furqon]]>
<![CDATA[ Jurnal Keteknikan Pertanian Vol. 10 No. 3 (2022): Desember 2022 ]]>
Publisher : <![CDATA[PERTETA ]]>
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DOI: 10.19028/jtep.010.3.319-327
<![CDATA[Palm Oil Mill Effluent (POME) has the potency to be converted to biohydrogen by dark fermentation. The statistical approach was used to determine the relationship between pH and biohydrogen production. This study aims to investigate the effect of pH on biohydrogen production with a statistical approach. Three substrates were treated with neutral pH and three without pH treatment. This experiment used the trapezoidal numerical integration method to get the total production of H2 produced per measurement time interval. There are nine substrate combinations tested. Three tests concluded that there was no difference in hydrogen production due to the pH treatment, and the sixth test concluded that there was a difference in hydrogen production due to the influence of pH. The tendency of every substrate to influence biohydrogen production without pH treatment and with pH treatment is a polynomial degree 3.]]>
