Judul: Kadar Hara Makro dan Logam Berat Latosol Darmaga yang Diperlakukan Terak Baja dan Bahan Organik
Abstrak: Indonesia is located in the tropical climate area with high temperature and rainfall, and generally has acidic soils with low fertility. Latosol is one of the highly weathered soils that has low organic matter content, low CEC, low BS, and high to very high clay fraction in all soil horizons. The fertility of Latosol can be improved by addition of ameliorans such as steel slag and organic matter. Steel slag is byproduct of purification process of iron ore in steelmaking. Previous studies showed that steel slag is potential to be used as soil amelioran since it has 20-50% or more CaO, and contains Mg, Si, Fe and some other elements. Previous studies also showed that steel slag as liming material was better than dolomite. Utilization of steel slag as soil amelioran in Indonesia, however, is limited by the Indonesian regulation that categorized all steel slags as hazardous and toxic wastes (limbah B3 = limbah bahan berbahaya dan beracun). Since there are various steelmaking processes, not all steel slags included in hazardous and toxic wastes as indicated by previous studies. The objective of this research is to analyze soil chemical properties that include pH, macro nutrients content (N, P, K, Ca and Mg), and heavy metals content (As, Pb, Sn, Cd and Hg) after cultivation of caisim in Latosol that treated with steel slag, organic matter, and their combination. The research was conducted in Factorial Randomized Block Design with three factors. The first factor was the type of steel slags that comprised of S1 (converter steel slag from Japan) and S2 (electric furnace steel slag from Indonesia). The second factor was the dosages of steel slag (4 dosages namely T0, T1, T2, T3), while the third factor was organic matter (B0 and B1). The each treatment was consisted of 4 replication such that there were 64 experimental units. The results showed that the soil pH increased with the increasing of steel slag dosages, and the type of the steel slags gave the same effect toward soil pH. Available P was increased by S2 treatment but not by S1 treatment. Exch-Ca and exch-Mg were increased by both slags. S1 treatments increased the exch-Ca by 113-265%, and the exch-Mg by 27%. The S2 treatments increased the exch-Ca by 91-144%, and the exch-Mg by 75-326%. Organic matter treatments increased pH, available P, and exch-Ca of the soil. Combination of slags and organic matters treatments increased exh-Mg, but decreased exch-K. Slag, organic matter, and their combination treatments decreased the soluble Pb and Hg of the soil. In some combination treatments, however, soluble Cd, soluble As, and soluble Sn were increased consecutively to 0.01 ppm, 0.01-0.02 ppm, 0.08-0.15 ppm from undetected concentration of the untreated soil.
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Judul: Pengaruh Pemberian Blast Furnace Slag, Electric Furnace Slag, Dolomit dan Silica Gel terhadap Sifat Kimia Tanah Gambut Dalam dari Desa Arang-Arang Jambi
Abstrak: Peat soil is soil having layers consisting high of organic materials (C-Organic > 18 %) whitin the thickness 50 cm or more. Organic materials of peat soil is formed by remnamt of decaying plants that have not been smashed perfecly because saturated water environmental conditions and low nutrient. Utilization of peat soil in agriculture is faced to several problems, especially chemical characteristic of the soil that is not supporting the growth of plants well. The characteristics are soil reaction which extremely acid, low base sarutation, very high cation exchange capacity and low nutrient balancing. Consequently, it is required improvements in chemical characteristic of soil such as application like steel slag. This research was purposed to investigate the effect of blast furnace slag (BF slag), electric furnace slag (EF slag), dolomite, and silica gel on chemical soil properties of peat soil and the availability of toxic heavy metal in the soil. This research was conducted by incubation experiment in laboratory using peat soil from Kumpeh, Jambi. Treatments applied were EF slag, BF slag 0 %, 2 %, 4 %, 6 %, and 8 %; dolomite and silica gel equivalent to EF slag 0 %, 2 %, 4 %, 6 %, and 8 %. The experimental design used was completely randomized design (CRD). The result of statistic analysis showed that BF slag, EF slag and dolomite significantly increased soil pH, and available Ca and Mg in the soil. The effect of treatments on available K and total N were not significant. EF and BF slag significantly increased available P in the soil, but dolomite and silica gel did not. EF slag treatment significantly increased available Fe in the soil, but BF slag, silica gel and dolomite did not. Dolomite and silica gel did not increase available Mn in the soil, but EF and BF slags significantly increased. Result of available Cu analysis indicated that among treatments only silica gel 8% increased available Cu in soil. EF slag and silica gel treatments increased Zn in the soil, but BF slag and dolomite treatment did not. EF and BF slags significantly increased available SiO2 in the soil, while dolomite and silica gel did not. The result of the heavy metal analysis showed that all treatments significantly reduced available Pb and Cr in the soil, but did not reduce available Cd and Hg in the soil.
Keyword: heavy metal levels., Nutrient level, Silica gel, Dolomite, Slag, Peat

Judul: Penerbangan Otomatis Pesawat Tanpa Awak Jenis Sayap Tetap dengan iNav
Abstrak: Pesawat tanpa awak (UAV) dapat dikendalikan secara manual dengan remote control atau secara otomatis dengan flight controller (FC). Salah satu jenis UAV adalah sayap tetap yang memiliki bentuk seperti pesawat terbang pada umumnya. Penelitian ini bertujuan untuk melakukan penerbangan otomatis pada UAV jenis sayap tetap dengan mengkonfigurasi perangkat FC. UAV yang digunakan adalah model SkySurfer X8 dengan bentang sayap 1.4 m. FC yang digunakan adalah Matek F405-Wing yang dikonfigurasi dengan perangkat lunak iNav. Berdasarkan hasil uji terbang, UAV berhasil terbang secara otomatis mengikuti skenario yang diberikan. Skenario terjauh berupa persegi berukuran 600×600 m pada ketinggian 100 m, yang ditempuh dalam waktu sekitar 2 menit dengan kecepatan sekitar 65 km/jam. Diharapkan prosedur perakitan, konfigurasi, operasi, dan hasil data uji terbang dapat menjadi acuan dalam penelitian selanjutnya.
Keyword: iNav, penerbangan otomatis, pesawat tanpa awak, sayap tetap