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Fiametta Ayu Purwandari
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agriTECH
Published by Universitas Gadjah Mada
ISSN : 02160455     EISSN : 25273825     DOI : 10.22146/agritech
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Agritech with registered number ISSN 0216-0455 (print) and ISSN 2527-3825 (online) is a scientific journal that publishes the results of research in the field of food and agricultural product technology, agricultural and bio-system engineering, and agroindustrial technology. This journal is published by Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta in colaboration with Indonesian Association of Food Technologies (PATPI).
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 1,392 Documents
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Rancang Bangun Alat Ukur Curah Hujan Elektronik Winarto Winarto; R. Handoyo; Bambang Hari Priyambodo
agriTECH Vol 11, No 3 (1991)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2757.524 KB) | DOI: 10.22146/agritech.19225

Abstract

Kehidupan dan perencanaan dalam bidang pertanian sangat tergantung pada keadaan cuaca terutama suhu, penyinaran matahari, dan ketersediaan air. Oleh karena letak geografis Indonesia pada ekuator. maka ketersediaan sinar matahari dan terjaganya kestabilan suhu dapat terpenuhi sepanjang tahun dalam jumlah yang cukup, tetapi tidak demikian halnya dengan air, karena air pada umumnya dipenuhi dari curah hujan pada musim hujan dan saluran irigasi pada musim kemarau. Agar pemanfaatan air hujan dapat lebih elektif, diperlukan pengukuran yang tebih elektif pula. Untuk keperluan tersebut telah dibuat alat ukur curah hujan erektronik dengan menggunakan sistem konstruksi cantilever sebagai detektor, dan sistem umpan batik pada alat perekamnya (recorder), serta dengan harga yang relatif lebih murah. komponen-komponen penyusunnya mudah diperoleh di pasaran. dan kemampuan yang cukup memadai. Prototipe alat ukur curah hujan hasil rancang bangun mempunyai kepekaan 0.51329 mm panjang/(mm curah hujan), ketidaktelitian 2,57493 mm-curah hujan, dan besar ketidaktepatan 2,59153 mm-curah hujan pada tingkat kepercayaan 95%
Aktivitas Fitase Pada Tahap-Tahap Pembuatan Tempe dari Kara Benguk, Gude, dan Kara Putih Menggunakan Usar Tranggono Tranggono; Sutardi Sutardi; Meta Mahendradatta
agriTECH Vol 11, No 4 (1991)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2236.645 KB) | DOI: 10.22146/agritech.19226

Abstract

Penelitian dilakukan untuk mengkaji perubahan aktivitas fitase selama proses pembuatan tempe kara benguk, gude dan kara putih dengan menggunakan usar. Ekstrak kasar fitase dipersiapkan metalui beberapa tahap isolasi dan pemurnian, sedangkan aktivitas Masa diukur berdasarkan jumlah fosfat anorganik yang dibebaskan dari substrat natrium fitat pada kondisi pengujian yang ditetapkan. Suhu dan pH optimum untuk fitase kara benguk dan kara putih berturut-turut 60°C clan 4,8 sedangkan untuk gude berturuHurut 50°C dan 5.0. Hasil yang diperoleh menunjukkan penurunan aktivrtas fitase selama perlakuan perendaman pada kara benguk dan kara putih, berturul-turul dan 129.56- 48.73 μ mol dan 169,30-77.92 μ mol. Pada gude tidak ditakukan pengujian aktivitas fitase selama perlakuan perendaman, Pada tahap fermentasi 0 - 24 jam. terjadi kenaikan aktivitas fitase berturut-turut dari 0 - 193,23 μ mol, 0 - 96.24 μ mol dan 5,56-46,33 μ mol untuk kara benguk, gude dan kara putih. Setelah 24 jam ferrnentasi, aktivrtas fitase turun menjadi berturut-turut sebesar 60,72 μ mol. 59.56 μ mol dan 7.68 μ mol. Selama fermentasi 36 - 48 jam, aktivitas fitase naik lagi berturut-turut sebesar 164,76 μ mol, 118,59 μ mol dan 9,27 μ mol untuk kara benguk. gude dan kara putih. Selama proses pembuatan tempe kandungan asam fitat turun berturut-turut dari 0,37 - 0,14%, 0,42 - 0,10% dan 2,26 - 0.16% masing-masing dalam berat kering untuk kara benguk, gude dan kara putih,
Hydrolysis of Soybean Protein by Aspergillus sojae, A. oryzae, and Rhizpus oligosporus Endang Sutriswati Rahayu
agriTECH Vol 11, No 4 (1991)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2604.098 KB) | DOI: 10.22146/agritech.19227

Abstract

Three species of molds, i.e. Aspergillus sojae. A. oryzae and Rhizopus oligosporus were used to hydrolyze soybean proteins. Whole soybeans were soaked overnight and cooked in boiling water for an hour, drained, sterilized at 121°C for 15 minutes, then cooled and inoculated with A. oryzae. A. sojae, and R. oligosporus. As a control treatment another batch of soybeans was prepared for spontaneous fermentation. Fermentation tasted for five days. Based on the colony forming units (CFU), A. sojae, A. oryzae R. orgosporus and the control reached the stationary phase on the third day of fermentation. The CFU of A. sojae and A. oryzae were higher than that of the others, with 107 - 108 CFU/g dry weight for A. sojae and A oryzae and 106 - 107 CFU/g dry weight for the others. The proteolytic activity of A. sojae. oryzae, R. oboosporus and the control was maximum on the third day. The proteolytic activity of A: sojae and A. oryzae using soybean as substrate was higher (180 - 200 units tyrosine/g dry weight) than the other two groups (100 - 120 UT/g dry weight).Based on the efficiency of hydrolysis, A. sojae and A. oryzae had a higher hydrolysis percentage, giving 32 - 33% and total soluble nitrogen of 2.1 - 2.2 percent/g dry weight. The hydrolysis efficiency of R. ologosporus and the control was 21 - 22%. with the total soluble nitrogen 1.4 - 1.5 percent/g dry weight. The difference in initial pH i.e. pH 5.0: pH 6.0 and pH 6.7 did not affect the soluble nitrogen production significantly.
Crab As A Coconut Oil Separating Agent Sebastian Margino
agriTECH Vol 11, No 4 (1991)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3242.029 KB) | DOI: 10.22146/agritech.19228

Abstract

The role of sterilized and nonsterilized crab extract on the separation of coconut oil was examined using grated coconut meat as substrate. Sterilized crab extract was prepared by suspension and centrifugation of crushed crab and then filtrated using Millipore Utter. Sterilized crab extract has proteolytic activity but not lipolytic one. It was found that the sterilized crab extract supported the growth of proteolytic microbes, isolated from fermentation process of coconut oil. Both sterilized and nonsterilized crab extract gave no significant difference in the quantity of coconut oil obtained. However, coconut oil from the sterilized crab extract has better quality. The peroxide value of coconut oil from unsterilized crab extract was higher than that of standard quality of coconut oil according to SII and AOCS. The possible roles of crab inoculum in fermentation process of coconut oil are discussed.
Tropical Hydrology Simulation Model 1 For Watershed Management (Trophydsim-1) Sahid Susanto
agriTECH Vol 11, No 4 (1991)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4981.306 KB) | DOI: 10.22146/agritech.19229

Abstract

A hydrological. simulation model, named the Tripical Hidrology Simulation Model I (Trophydsim-1), was created in order to simulate the run-off processes in mountainous terrain in a tropical monsoon region. The hydrological cycles in five major land covers, i.e., forest, upland, plantations (normally tobacco areas), paddy fields, and settlements, were each analogized by a series of four storages representing interception. depression, upper. zone and lower-zone storages. A set mathematical equations expressing empirical formula as well as physical law were employed in the model. An automatic parameter optimization routine was presented. The model was applied to the Kali Progo river basin. Central Java. Indonesia. which contains five subbasins. The simulated and recorded hydrographs were in close agreement both at every transfer point of the subbasins and in three different calendar years with different land use patterns.Some hydrologic characteristics were found from application of the model. The basin, which is mainly comprised of fresh volcanic formations. is capable of storing much water and releasing it gradually as groundwater flow. Therefore. the basin provides stable low flow for irrigating paddy land, which has expanded to 40 to 60 percent of the whole basin area. with multiple cropping patterns of rice-rice-upland crops or even rice-rice-rice.The model was also applied to simulate the effect on water regime of different modes of watershed management of simply land use patterns. Five scenarios representing extreme conditions of land use and four more realistic
Perubahan Kandungan Asam Fitat dan Aktivitas Fitase Pada Pembuatan, Penyimpanan, dan Pemasakan Tempe Sutardi Sutardi
agriTECH Vol 12, No 1 (1992)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2348.057 KB) | DOI: 10.22146/agritech.19230

Abstract

Tempe dengan bahan baku kedelai varilas Forrest dibuat dengan modifikasi cara iradisional yang biasa dilakukan oleh masyarakat Indonesia. Kedelai yang dipersiapkan diinokulasi dengan biakan murni Rhizopus oligosporus strain CT11K2 atau usar. Kedua jenis inokulum tersebut menghasilkan tempe dengan mutu baik. Fdase yang dihasilkan oleh tamur inokulum terbukti dapat menurunkan kandungan asam idat sebesar 40% selama berlangsungnya fermentasi tempe. Penyimpanan tempe selama 3 minggu pada suhu 5°C dan atau selama 3 han pada suhu 30°C menyebabkan penurunan lanjut kandungan asam fitat berturut-turut sebesar ± 70 dan 60%. Adapun penyebab penurunan kandungan asam heat selama penyimpanan tempe adalah aktivitas fitase inokulum. Tempe segar dan tempe yang telah disimpan pada kondisi penyimpanan seperti tersebut diatas mengalami penurunan kandungan asam fitat sebesar 39 - 72% seieiah digoreng dengan minyak kedelai selama 2 - 3 menit pada suhu 180°C, sedangkan perebusan selama 10 menit menyebabkan penurunan kandungan asam fitat sebesar 45 - 75%.
Identifikasi Bentuk Hubungan Tahanan Penetrasi dan Berat Volume Kering Pada Tanah Pasiran Abdul Rozaq
agriTECH Vol 12, No 1 (1992)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1516.131 KB) | DOI: 10.22146/agritech.19231

Abstract

.
Beberapa Sifat Anti-Tripsin Biji Kecipir Zuheid Noor
agriTECH Vol 12, No 1 (1992)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2835.418 KB) | DOI: 10.22146/agritech.19233

Abstract

Untuk mempelajari sifat anti-tripsin kecipir. khususnya sifat inaktivasi pada beberapa pH, biji kecipir utuh direndam pada berbagai kombinasi kondisi pH(3. 5, dan 9), suhu (suhu kamar dan 60°C), dan lama perendaman (4.8. dan 24 jam) Setelah perendaman. ditiriskan. dan air rendaman ditampung. Hasil pengukuran aktivitas anti-tripsin pada biji dan air rendaman menunjukkan bahwa perendaman pH 3 suhu kamar meningkatkan akitvitas anti-tripsin dan 64,00 unit/mg menjadi 94,10; 72,28 dan 82,29 unit/mg berturut-turut pada lama perendaman 4, 8 dan 24. Pemanasan 60°C sedikit menurunkan akiivitas antitripsin; penurunan aktivitas semakin besar dengan semakin lama waktu perendaman. Perendaman pH 5 pada semua. kombinasi perlakuan mengakibatkan inaktivitasi total aktivitas anti-tripsin, sedang perendaman pH 9 tidak menghasilkan inaktivasi sebagaimana diharapkan, menunjukkan bahwa anti-tripsin biji kecipir tahan terhadap perlakuan pH 9. Perembesan anti.tripsin kedatam air rendaman sedikit membantu penurunan aktivitas anti-tripsin dalam biji kecipir. Uji biologikal menggunakan tikus putih rremperkuat basil pengamatan percobaan inaktivastianti-tripsin kecipir ditinjau dari penurunan berat tikus, namun tidak diamati adanya kelainan pada pankreasnya, tetapi teramati adanya penurunan berat hati oleh sebab yang belum diketahui.
Pengembangan Irigasi, Produksi Pangan, dan Implikasinya Terhadap Siklus Air Sahid Susanto
agriTECH Vol 12, No 2 (1992)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2091.292 KB) | DOI: 10.22146/agritech.19234

Abstract

The cereal production especially rice has increased sharply in Indonesia. The irrigation development program implemented by the government has become an important rote in the production process. However, expansion of irrigated paddy lands significantly influence the hydrological regime in its basin. A set of basic indicator for assessing the hydrological implication of the development in a river basin was proposed.
Perbaikan Penjatahan Air Irigasi Cara Giliran Berdasarkan Kehilangan Waktu Tempuh Aliran Air di Saluran Muhjidin Mawardi
agriTECH Vol 12, No 2 (1992)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1853.778 KB) | DOI: 10.22146/agritech.19235

Abstract

Study of time allocation in rotational irrigation system was carried out in Cikesik Irrigation Scheme, Cirebon, West Java during the dry season of 1989/1990. The study aims to estimate lime loss factor in water allocation and distribution, and to demonstrate the use of time loss factor for improvement of water allocation and distribution by rotational method. Results of the study show that during the water flowing in the canal systems, there is time toss beside hydraulics and volumetric losses. All these types of losses will significantly influence on opportunity of offtake time by each tertiary blocks, and therefore, its should be used together as considerations for allocating and distributing irrigation water. By using the improved method, equity in water distribution as the main objective of the rotational water distribution will be improved.

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