Kajian Sifat Fisik Lahan Gambut dalam Hubungan dengan Drainase untuk Lahan Pertanian

Kajian tentang tanah gambut banyak di lakukan dalam rangkausaha pengembangan lahan gambut sebagai lahan pertanian. Penelitian yang mendasar tentang gambut, khususnya sifat gambut tropika di Indonesia masih sangat terbatas. Pengetahuan tentang sifat gambut tropika sangat penting karena selainsifatnya yang sangat khusus, data tersebut diperlukan apabila ingin mengembangkan lahan gambut sebagai laban pertanian

Analisis Kebijakan Pemanfaatan Sumberdaya Danau Yang Berkelanjutan (Studi Kasus Danau Maninjau Sumatera Barat)

This study aims to formulate policies to preserve environment resources functions related to the use of lake. Descriptive method with survey techniques through observation is used to achieve those objectives, in-depth interviews with those who under­stand the problem. Analysis of the data is done through three lines of activity simultaneously, which are data reduction, data presentation, and conclusion

Performance of Shallow Groundwater Irrigation Schemes in Nganjuk-East Java, Indonesia

Rosana G. Moreira, Editor-in-Chief; Texas A&M UniversityThis is a paper from International Commission of Agricultural Engineering (CIGR, Commission Internationale du Genie Rural) E-Journal Volume 9 (2007): Performance of Shallow Groundwater Irrigation Schemes in Nganjuk-East Java, Indonesia. Manuscript LW 07 013. Vol. IX. June, 2007

Peranan Irigasi dan Permasalahannya dalam Swasembada Beras di Indonesia

Pembangunan Jangka Panjang I (PJP-I), sektor pertanian yang didukung pembangunan irigasi merupakan prioritas pembangunan ekonomi. Dalam kurun waktu 1969-1993 telah diperoleh hasil-hasil sebagai berikut:direhabilitasi jaringan irigasi seluas 2.9 juta ha di Jawa, Sumatra, Sulawesi, Nusa Tenggara dan Kalimantanluas areal sawah beririgasi mencapai 5.7 juta ha pada tahun 1993 akibat pembangunan jaringan irigasi baru seluas 1.6 juta haluas lahan sawah beririgasi teknis, semi teknis, sederhana dan sebagainya, bertambah dari luas 3.388 juta ha tahun 1968 menjadi 4.779 juta ha pada tahun 1985, dan 8.227.149 ha pada tahun 1993

IRRIGATION EFFICIENCY AND UNIFORMITY OF AEROPONICS SYSTEM

ABSTRACT The evaluation of the irrigation efficiency and coefficient of unttotmity (CU) of the existing aeroponics system has been conducted for one growing season of petsai (Brassica pekinensis L) in Parung - Bogor, Indonesia. The evaluation covers the CU of the spray discharge, pH, temperature and electrical conductivity (EC) of the nutrient solution. It was concluded that the CU of spray discharge, pH and temperature of the nutrient solution were relatively high, but the CU of EC of the nutrient solution was relatively low. Conveyance efficiency and water-use efficiency were about 84.38% and 40.09%, respectively. The average crop water requirement was about 1,457 cc/crop/season or equal to 16,870 cc per Kg of petsai produced. Diterima: 02 Januari 2007, Disetujui: 19 Pebruari 200

Optimization of Vegetative Stage of Baby Cucumber (Cucumis sativus L. Var. Marta) using the Genetic Algorithm

An  optimization was conducted to a growth model for baby cucumber (Cucumis sativus L. Var. Marta). The model gives information of nutrient intake and micro climate conditions (temperature, humidity, and irrediation) to get response of the plant (ratio of canopy area and stem diameter) and the loss of nutrient solution. The model ws then coupled with genetic algoritm in order to get optimum result efficiently. Two fitness functions were used in the application og genetic algoritm. The result showed that the first fitness function could be used to optimize the plant response (ratio of canopy area and stem diameter) and the loss of nutrient solution efficiently as indicated by the maximum fitness value (Pc = 0.6 and Pm = 0.01)

REVIEW TRICKLE IRRIGATION APPLICATION IN GROUNDWATER IRRIGATION SCHEMES

ABSTRACT The Government of Indonesia has developed groundwater irrigation schemes in some province e.g. East Java, Central Java, Yogyakarta, Wast Java, Bali, West Nusa Tenggara and East Nusa Tenggara. However, not all regions were able to optimally utilize it. The irrigation effeciency of groundwater irrigation scheme was about 59%, whe;; the wells-pumping efficiencies were varied from 28 to 98 %. In thefuture, the irrigation effieciency should be increased to anticipate water deficit during dry season. The application of trickle irrigation in indonesia has not been widely developed. Although trickle system has been used, however, it is still limited for few commercial agribusinesses. Trickle irrigation systems have a prospect to be developed in some regions having limited water resources. For preliminary stage, the systems could be applied in groundwater irrigation schemes that have been developed either by farmers or government. Keywords: irrigation effieciency, trickle irrigation, groundwater irrigation scheme

RANCANGAN HIDROLlKA IRIGASI TETES UNTUK TANAMAN SEMANGKA DI LAHAN KELOMPOK TANI SEROPAN MAKMUR, KABUPATEN GUNUNG KIDUL, D.I. YOGYAKARTA

ABSTRACT Hydraulic design of trickle irrigation sub unit is very important to achieve high irrigation uniformity and efficiency of its schemes. The sub unit is a pipeline in a trickle irrigation block which is consists of a manifold line, some laterals and emitters. The hydraulic criteria has been used in the design of trickle irrigation scheme for water melon (Citrullus vulgaris L.) at an existing pipeline system of surface irrigation scheme in Seropan Area, Yogyakarta. The hydraulic criteria includes pipeline hydraulics of lateral and manifold, system capacity, and total dynamic head. The number and size of sub unit has been designed, and the head losses (hf) at lateral and manifold were ≤ 11% and ≤ 9% of emitter operating pressure (Ha) respectivel. Theoritically,  variation of emitter discharge will vary at 1.16-1.61%. Diterima: 2 Januari 2007; Disetujui: 30 Januari 2007