Judul: Effects of Plant Density and Nodes Cutting on Sweetpotato (Ipomoea batatas L.) Growth and Yield in Polybag in Context of Urban Farming
Abstrak: Ubi jalar (Ipomoea batatas L.) memiliki potensi dalam pertanian perkotaan. Stek mini dapat menurunkan kebutuhan bahan tanam. Kerapatan tanam yang lebih tinggi dapat meningkatkan efisiensi lahan. Penelitian ini bertujuan untuk menentukan jumlah buku bibit dan kerapatan tanam yang optimal bagi pertanian kota yang efisien. Penelitian dilakukan antara Mei - Oktober 2021 di Setu, Tangerang Selatan. Penelitian dirancang dengan split plot-rancangan kelompok lengkap teracak (SP-RKLT). Faktor pertama adalah jumlah buku bibit dengan taraf 2, 4, dan 6 buku. Faktor kedua adalah kerapatan tanam dengan 1, 2, dan 3 stek per polybag. Hasil menunjukkan bahwa bibit dengan buku yang lebih banyak memiliki pertumbuhan batang, daun, dan buku awal yang lebih baik sampai 8 MST. Perlakuan 1 stek per polybag memberikan pertumbuhan akhir individu tinggi namun perlakuan 2 dan 3 stek per polybag memberikan pertumbuhan per polybag dan hasil umbi yang paling tinggi., Sweet potato (Ipomoea batatas L.) has potential for efficient urban farming. Mini cutting can reduce plant material needs. High plant density can lead to more efficient land use. This research aims to deduce the most optimal node cutting and plant density for efficient urban farm. Research was done from May to October 2021 in Setu, Tangerang Selatan. This research is designed with split-plot randomized complete block design (SP-RCBD). First factor is node cutting with treatment 2, 4, and 6 node each cutting. Second factor is plant density with treatment 1, 2, and 3 cutting each polybag. Result shows that cutting with more node have better early growth until 8 weeks after planting. Plant density of 1 plant per polybag gives best individual plant late growth while 2 and 3 plant per polybag give better per polybag growth and tuber yield.
Keyword: jumlah buku bibit, kerapatan tanam, pertanian kota, polybag, ubi jalar, node cuttings, plant density, sweet potato, urban farming

Judul: The Effect Number of internodes and Time of Shoots Cutting and Number of Shoots Cut on The Productivity of Sweet Potatoes (Ipomea batatas L.) Clone Ase Kapas.
Abstrak: Ubi jalar (Ipomea babatas L.) merupakan salah satu tanaman sumber karbohidrat yang ada di Indonesia. Sistem budidaya tanaman yang kurang baik menyebabkan tidak maksimalnya produktivitas dari tanaman ubi jalar. Penelitian ini bertujuan mengetahui pengaruh jumlah buku dan waktu pemotongan pucuk pucuk dan jumlah pucuk yang di potong terhadap produktivitas ubi jalar (Ipomea batatas L.) klon Ase Kapas. Perlakuan buku dengan tiga taraf yaitu lima, enam dan tujuh buku sedangkan perlakuan pemotongan pucuk dengan lima taraf yaitu pemotongan dua pada bulan kedua, pemotongan dua pada bulan ketiga, pemotongan enam pada bulan kedua, pemotongan enam pada bulan ketiga dan tidak dipotong. Hasil penelitian menunjukkan perlakuan pemotongan pucuk dan jumlah buku tidak berpengaruh terhadap bobot, diameter, panjang dan jumlah umbi. Perlakuan tujuh buku berpengaruh terhadap parameter vegetatif tanaman., Sweet potato (Ipomea babatas L.) is one of carbohydrate sources in Indonesia. The poor crop cultivation system causes the productivity of the sweet potato crop is not maximal. This research aim to determine the effect number of internode and time of shoots cutting and number of shoots cut on the productivity of sweet potato (Ipomea batatas L.) clone Ase Kapas. The treatment of the internodes was three levels, namely five, six and seven segments, while the treatment of the shoot cutting was five levels, namely cutting two in the second month, cutting two in the third month, cutting six in the second month, cutting six in the third month and no cutting. The results showed that shoot cutting and internodes treatments had no effect on weight, length diameter and number of tubers. The treatment of seven segments had an effect on the vegetative parameters of the plant.
Keyword: Cutting, internodes, productivity, shoot, vegetative

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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