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Gatot Irianto
Direktorat Jenderal Pengelolaan Lahan dan Air/Ahli Peneliti Utama Bidang Agroklimat dan Hidrologi
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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KAJIAN EVALUASI LAHAN UNTUK PENGEMBANGAN CENDANA DINUSA TENGGARA TIMUR Hendrisman, Marwan; Sosiawan, Hendri; Irianto, Gatot
BERITA BIOLOGI Vol 5, No 5 (2001)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (359.751 KB) | DOI: 10.14203/bb.v5i5.1468

Abstract

Komoditas kayu cendana menyumbangkan Pendapatan Asli Daerah (PAD) sampai 40% untuk Propinsi Nusa Tenggara Timur (NTT),sehingga dapat dijadikan komoditas andalan bagi Propinsi ini. Pulau Sumba dan Pulau Timor diduga merupakan tempat asal tumbuh cendana, sehingga untuk pengembangan budidaya cendana dapat dicari daerah yang mempunyai ekosistem yang mirip dengan daerah asalnya.Teknologi budidaya tepatguna bagi cendana perlu dikembangkan untuk memperluas areal tanam komoditas tersebut.Untuk itu perlu dibentuk suatu dewan riset cendana secara lintas sektoral dari berbagai disiplin ilmu.
PANEN HUJAN DAN ALIRAN PERMUKAAN UNTUK PENINGKATAN PRODUKTIVITAS PERTANIAN LAHAN KERING, PENANGGULANGAN BANJIR DAN KEKERINGAN Irianto, Gatot
BERITA BIOLOGI Vol 5, No 1 (2000)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (669.893 KB) | DOI: 10.14203/beritabiologi.v5i1.1096

Abstract

Rainfall and runoff harvesting study at the Kali Garang basin, Semarang under the cooperation program between Centre for Soil and Agroclimate,Agency of Agriculture Research and Development (CIRAD) France and Government of Central Jawa for improving soil productivity,controlling flood and drought are presented in this paper.The results show that through water harvesting it is possible to increase diversity, improving added value and decreasing agriculture risks of agriculture commodity. Moreover rehabilitation of degraded land and soil conservation practices can be promoted.
PENGEMBANGAN TEKNOLOGI PANEN HUJAN DAN ALIRAN PERMUKAAN UNTUK MENEKAN RESIKO KEKERINGAN DAN MENINGKATKAN PRODUKTIVITAS LAHAN (Studi kasus di Sub DAS Bunder, Kabupaten Gunungkidul, Provinsi DIY) Irianto, Gatot; Pujilestari, Nurwindah
BERITA BIOLOGI Vol 6, No 3 (2002)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (476.684 KB) | DOI: 10.14203/beritabiologi.v6i3.1228

Abstract

Limited water supply on dry season at dry terrain,cause plantation index and plant productivity low. Mean while yearly water volume are potentially enough for twice plant even more if they manage well. Because of that reason using and developing water resource by rainfall and run off harvesting technology, increasing productivity and maintain dry terrain farm operations system at watershed system are approximation strategy needed to put into practice. That strategy can put into practice through hydrologist characteristic modification at river flow area with escalating capacity and capability watershed distribution to minimalist inundation risk and dried out at dry season. Research result at sub watershed Bunder, Wonosari, DIY by way of building two level dam at river bed (hydrology network) can producing 11.6% (channel reservoir 1) and 18.4% (channel reservoir 2) surface flow from existing river-bed and this result can supply water irrigation at least 3 times in planting season rice-secondary crop- secondary crop). If cropping pattern change to rice-rice-secondary crop then run off harvest need to increase become 100% at upper subwatershed (channel reservoir 1) and 19% at lower subwatershed, with condition at MK 1.irrigation area that can be plant with rice only 0.19 ha and the rest of it can be plant with peanut. Rice productivity at rice field are 2.4 ton/ha.
ANALYSIS ON WATER POTENTIAL AND REQUIREMENT FOR RECOMMENDING SUPPLEMENTARY IRRIGATION ON UPLAND SUGARCANE IRIANTO, GATOT; SURMAINI, E.
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 20 (2002): Desember 2002
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n20.2002.%p

Abstract

Sugarcane planted in dry season (April to September) in Lampung usually experiences water deficit especially during initial and vegetative phases. Compared with other phases, water deficit in those periods decreases yield badly. To minimize water stress and estimate irrigation need, the research was conducted in two steps as follows: (1) analysis of water resources potential using hydrological water balance, (2) estimating water balance within rooting zone and yield loss potential using ETR/ETM ratio of FAO for recommending supplementary irrigation. The results showed that the sugarcane planted in April, May, and June suffered with water supply of135, 151, and 106 m3 in June, July, and August, respectively. Water deficit caused ETR/ETM value fell below minimum requirement (0.65) with yield loss between 16-45%. Based on the water requirement, water holding capacity, and minimum requirement of ETR/ETM, recommended irrigation during critical phases was 20 mm weekly. The recommendation was able to minimize yield loss from 16-45% to become 4-21%. Based onwater resources identifications within and the adjacent areas, irrigation requirement could be provided sufficiently if number, distribution, capacity, and mechanism of run off harvesting in cascade channel reservoir are optimum.
RICE FIELD DISCHARGE MODELLING BY TAKING INTO ACCOUNT THE CONTRIBUTION OF PREVIOUS TERRACE DRAINAGE IRIANTO, GATOT; LAS, IRSAL
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 18 (2000): Desember 2000
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n18.2000.%p

Abstract

Its been a long time that paddy terraces have been used in order to modify local hydraulic characteristics, aiming thus at a better evenness in water collecting and distribution. Nevertheless, the quantification of water transfer mechanism in terraces has still to be fully understood. Research on modeling for water transfer has been carried out to answer this issue.The two following reservoir linear laws have been used to represent water transfer in the terrace: (1) taking into account continuous discharge contribution of the precedent terrace and (2) taking into account discontinuous discharge contribution of the precedent terrace. The results of research show that a universal discharge equation for the nth terrace, based on the reservoir linear law derived through inductive method, can be described as:where : Qn is the discharge from the nth terrace (m3/s), Q0 the initial discharge (m3/s), k is a reservoir constant (s-1),and t is the time(s). According to the physical law, the inflow drained from the previous terrace has to be taken into account, but in this case,discharge modeling is reduced to the time when linear reservoir law still applies. This is because time taken for the terrace to be fully drained-dry would be infinite: thus when the water level is under the drain level axis, the linear reservoir law does not apply anymore. At this time, the main part of the stock can not be computed using surface and water level, because of local surface roughness. To find a solution, the debit was modeled byassuming that water on the terrace was fully drained when the water surface reaches exactly half the diameter of the drain pipe. Results of such a model show that the debit thus evaluated approach the debit measured with a coefficient F (criterion of Nash and Sutcliffe) variegating between 0.97 and 0.98. With such results this model can be accepted, assumingas a basic hypothesis that the terrace is dry when water its surface reaches half of the drain pipe diameter.
Co-Authors E. SURMAINI Irsal Las Marwan Hendrisman, Marwan Nurwindah Pujilestari Sosiawan, Hendri