Judul: Optimasi Kebutuhan Air Tanaman Melon (Cucumis melo L.) pada Sistem Pocket Fertigation dengan Algoritma Genetika
Abstrak: Pemanfaatan model Algoritma genetika dapat digunaan untuk mencari nilai yang optimal. Model ini dapat menyelasaikan permasalah non linear yang sering terjadi pada bidang pertanian. Penelitian ini bertujuan untuk menganalisis pengaruh alat pocket fertigation terhadap produktivitas tanaman pada berbagai skenario penanaman serta menganalisis kebutuhan air optimal pada tanaman melon (Cucumis melo L.) dengan metode algortima genetika. Sistem pocket fertigation diduga dapat meningkatkan produktivitas tanaman. Penelitian ini melingkupi perencanaan alat pocket fertigation; pengamatan tanaman melon dengan skenario alat pocket fertigation dengan kain rezim basah (PK-H), alat dengan kain rezim kering (PK-L), alat tanpa kain rezim basah (PT-H), alat tanpa kain rezim kering (PT-L), kontrol (tanpa alat) rezim basah (PC-H), dan kontrol rezim kering (PC-L); analisis parameter lingkungan; penerapan algoritma genetika untuk menentukan nilai optimal. Hasil penelitian menunjukkan bahwa buah dengan bobot terbesar saat panen dimiliki oleh skenario PC-H seberat 1115 gram dan terkecil oleh PC-L seberat 551 gram. Skenario PK-L dan PT-L meningkatkan produktivitas air sebanyak 33% dan 63% jika dibandingkan dengan PC-L. Model optimasi dapat menduga kelembapan tanah optimal sebesar 0,34; 0,32; 0,31; 0,30; 0,26; 0,30; dan 0,29 dalam satuan m3/ m3 tiap 9 hari tanam selama penanaman. Nilai ini diduga dapat menghasilkan buah dengan bobot 1115 kg dan nilai kemanisan 8,6 brix.
Keyword: pocket fertigation, melon, algoritma genetika, kebutuhan air tanaman, crop water requirement, genetic algorithm, melon, pocket fertigation

Judul: Water Footprint Analysis on Melon Cultivation in Greenhouse Using Pocket Fertigation Subsurface Irrigation System
Abstrak: Potensi sumber daya air Indonesia mencapai 3,9 triliun m3/tahun, tetapi sekitar 3,2 triliun m3/tahun belum dimanfaatkan. Ketersediaan air irigasi berpengaruh pada pertumbuhan dan produksi tanaman. Budidaya tanaman melon cukup sulit dikarenakan kecocokan pada kondisi tanah dan udara di lingkungan pertumbuhan tanaman. Salah satu teknik irigasi yang dapat digunakan, yaitu pocket fertigation. Penelitian ini bertujuan menganalisis water footprint tanaman melon dalam greenhouse dengan sistem irigasi pocket fertigation dan konvensional, serta menentukan sistem irigasi paling optimal. Penelitian dilakukan bulan Maret-Juli 2022 di Kinjiro Farm, Kota Bogor. Tahapan penelitian meliputi persiapan lahan, budidaya tanaman melon, pengumpulan data, dan pengolahan data. Rancangan penelitian terdiri dari sistem irigasi pocket fertigation (PF) dan konvensional (SK), serta pemberian air satu kali (E) dan dua kali evaporasi (2E). Sistem irigasi PF-2E menjadi tanaman tertinggi dengan jumlah daun lebih banyak dibandingkan metode lainnya. Sistem irigasi PF-2E lebih efisien untuk diaplikasikan pada tanaman melon, dikarenakan memiliki hasil panen dan produktivitas air yang lebih tinggi, serta water footprint yang lebih rendah dibandingkan metode konvensional., The potential of Indonesia's water resource reaches 3,9 trillion m2/year, but around 3,2 trillion m2/year has not been utilized. Air irrigation affects plant growth and production. Melon plant cultivation is quite difficult because of its suitability to the soil and air conditions in the environment. One of the irrigation techniques is pocket fertigation. This research aims to analyze the water footprint of melon plants in a greenhouse with pocket fertigation and conventional irrigation systems, and determine the most optimal irrigation system. The research was conducted in March-July 2022 at Kinjiro Farm, Bogor City. The research stages include land preparation, melon cultivation, data collection, and processing. The research design consists of pocket fertigation (PF) and conventional irrigation systems (SK), as well as one time (E) and two times evaporations of water (2E). PF-2E irrigation system is the tallest crop with more leaves than other methods. PF-2E irrigation systems are more efficient to be applied to melon plants, because it has higher yields and water productivity, and lower water footprint than conventional methods.
Keyword: evaporation, irrigation, melons, pocket fertigation, water footprint

Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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