Rusman, Bujang
Civil Engineering Departement, Andalas University

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KAJIAN DAS BATANG BAYANG DAN TAMBAHAN DEBIT ALIRAN DARI BATANG SIKABAU UNTUK MEMENUHI KEBUTUHAN AIR DAERAH IRIGASI BATANG BAYANG Daoed, Darwizal; Rusman, Bujang; Istijono, Bambang; Ferial, Rudy
Jurnal Rekayasa Sipil Vol 11, No 2 (2015)
Publisher : Civil Engineering Departement, Andalas University

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Abstract

Bukit Barisan dengan hutan yang masih asli dan curah hujan yang cukup tinggi menjadikan provinsi Sumatera Barat umumnya dan Pasaman Barat khususnya mempunyai banyak daerah aliran sungai (DAS) yang dapat mengalirkan air melalui sungai/batang hingga bermuara di lautan Indonesia. Akan tetapi perubahan fungsi hutan dan iklim menyebabkan debit air yang diprediksi mampu mengairi areal pertanian seluas 10.000 ha di daerah irigasi Batang Bayang pada kenyataannya tidak dapat terpenuhi. Pada makalah ini akan dikaji kemampuan DAS Batang Bayang dan Batang Sikabau masing-masingnya. Kemudian kedua DASini diintegrasikan, sehingga debit andalan yang terjadiakan lebih besar. Untuk menggabungkan debit air dari dua DAS dilakukan dengan metode suplesi, yakni membuat saluran yang menghubungkan Batang Sikabau ke saluran induk di DI Batang Bayang. Hasil kajian menunjukan bahwa areal irigasi Batang Bayang dapat diairi lebih dari 5.140,20ha untuk tanaman padi dan lebih dari 41.956,36 hauntuk palawija. Diharapkan dampak secara tidak langsung dari saluran suplesi akan mengurangi debit banjir di Batang Sikabau bagian hilir.Kata kunci : Integrasi, Batang, Bayang, Sikabau, Suplesi.
Dinamika Beberapa Sifat Fisika Tanah Dibawah Sistem Usahatani Konservasi Pada Lahan Kritis Aripan Di DTA Singkarak Aprisal, Aprisal; Rusman, Bujang; Dwipa, Indra; Refdinal, Refdinal; Rahmayuni, Erlina; Fajriwandi, Fajriwandi
Jurnal Lahan Suboptimal Vol 5, No 2 (2016): JLSO
Publisher : Pusat Unggulan Riset Pengembangan Lahan Suboptimal (PUR-PLSO) Universitas Sriwijaya

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Abstract

Aprisal. et al. Dynamics of Some Physical Properties of Soils Under Conservation Farming System on the Critical Land Aripan in the DTA Singkarak. JLSO 5(2):137-144.The conservation farming on critical land can improve the soil properties and maintantain for a periode of time. The purpose of this research is to study the dynamics of critical land’s physical characteristics under the influence of conservation farming at Singkarak Water Catchment Area (DTA) in Nagari Aripan. The analysis of soil sample is conducted in Soil Science Department Laboratory, Faculty of Agriculture, Andalas University. This research is designed with Split Plot Design (RPT). The main plot is a soil processing system which is: conventional soil processing (po), soil processing with mulch (p1), soil processing with compost and manure (p2) and minimum soil processing (p3), while the sub plot consists of three types of plants, they are; sweet corn (t1), soy bean (t2) and peanut (p3). Each treatment is repeated three times. Result of the research is observation data in each season of the first, second and third year. To see the dynamics of soil characteristics, data of each season is viewed through graphic which based on its trend. The result of the research indicates that utilization of critical land with conservation farming system could repair and maintain some physical characteristics of soil in each growing season, such as: decreasing volume, increasing soil organic matter, porosity, and soil permeability. Productivity of soil increases on the conventional processing with mulch, compost, and manure. Conventional soil processing with added compost and manure increases productivity for 32.58% in the first year, 45.16% in the second year, and 59.73% in the third year.