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Rachma Wikandari
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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 2 Documents
 1 
Search results for , issue "Vol 16, No 1 (1996)" : 2 Documents clear
Pemakaian Hasil Analisis Harmonik Hasil Sedimen (Sediment Yield) Untuk Pemantauan dan Evaluasi Manajemen Daerah Aliran Sungai (DAS) (Studi Kasus Di Sub DAS Tapan) Sigit Supadmo Arif
agriTECH Vol 16, No 1 (1996)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2382.641 KB) | DOI: 10.22146/agritech.22507

Abstract

Departemen Kehutanan sebagai instansi pemerintah yang bertanggung jawab atas kelestarian hutan dan lahan atasan di suatu Daerah Aliran Sungai (DAS) telah melaksanakan beberapa program beserta tindakan pemantauan dan evalualinya (monitoring and evaluation), meskipun belum mempunyai prosedur dan metode yang baku. Tujuan utama tulisan ini ialah melakukan evaluasi manajemen DAS dengan memakai analisis harmonik hasil sedimen sebagai salah satu peubah (variable) pemantauan (monitoring) usaha perbaikan manajemen lahan yang telah dilakukan, dengan mengasumsikan bahwa proses perubahan watak DAS dalam kurun waktu yang ditinjau berlangsung dalam keadaan tunak. Lokasi penelitian dilakukan di Sub DAS Tapan yang merupakan bagian DAS Bengawan Solo. Analisis dilakukan terhadap data hasil sedimen untuk kurun waktu 1974 - 1979, 1983 -1988 dan 1986 - 1990. Hasil analisis menunjukkan bahwa pemakaian analisis harmonik memberikan akurasi nisbi tinggi pada kurun-kurun waktu awal dan semakin lama semakin mengecil untuk kurun-kurun waktu setelahnya. Hal ini dapat disimpulkan bahwa perubahan watak DAS dalam keadaan tunak berlangsung pada kurun waktu awal untuk kemudian berangsur-angsur berubah menjadi proses tak lunak sesuai dengan proses perubahan tata guna lahan. Proses tak tunak juga ditunjukkan oleh perubahan harga koelisien limpasan, fo, dalam kurun waktu yang ditinjau.
Pengembangan Model Operasi Pompa Berkelanjutan di Daerah Irigasi Sumur Pompa Dangkal Murtiningrum Murtiningrum; Sigit Supadmo Arif; Saiful Rochdyanto
agriTECH Vol 16, No 1 (1996)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4246.253 KB) | DOI: 10.22146/agritech.22510

Abstract

Model of sustainable pump operation in an unconfined groundwater irrigation system was developed to determine pump operation pattern which consist of the number of pumps, duration, and distance between pumps, so that crop water requirement is fulfilled and groundwater irrigation system is sustained. Total irrigation flow, EQpi, results in lowering water table which is called drawdown, sn. Drawdown sn should be less than di (sn< di) which (d1 is maximum drawdown which is affected by pump technology. Model outputs for the area of Sri Rahayu Farmer Group in Kedungtuban, Blora for existing cropping pattern show that average irrigation water requirement is 916.1mm/year and peak flow is 4.93 ips. It still can be fulfilled by 1, 2, 3, 4, or 9 pumps for 10 days operation continuously which is shown by the drawdowns which are less than maximum drawdown.

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