Judul: Penggunaan Giberelin dalam Pembibitan Tiga Jenis Pisang (Musa paradisiaca L.)
Abstrak: High demand of bananas pushes bananas producer for making bananas buds growth faster. One way to achieve that goal was using gibberellin. The aim of this research was to obtain the best banana which growth faster with addition of certain concentration of gibberellin and to obtain the best gibberellin concentrations that accelerate the seedling of three kinds of bananas. Banana used in this research were Ambon, Kepok and Rajabulu. The gibberellin concentrations induced were 0 ppm, 10 ppm, 100 ppm, and 500 ppm. The research compiled randomized complete block design using two factors with four repetition. The observed variables were buds length, number of buds, time of buds emerges, time for maturing buds, number of matured buds, and the percentage of buds live. Gibberellin concentrations didn’t influence the accelerate growth of buds. Among the three kinds of bananas, the fastest buds growth was Ambon banana. The growth of buds was better without gibberellin induction.
Keyword: growth, seedling, gibberellin, banana

Judul: Pengaruh Media Tanam dan Zat Pengatur Tumbuh Sitokinin (BA) terhadap Perbanyakan Tunas Pisang Raja Bulu (Musa Paradisiaca L.) dari Cacahan Bonggol.
Abstrak: Banana is the important and the highest production of Indonesian fruits. The propagation of banana using corm pieces known as the cheap and effective method, that also gives diseases resistance to shoots. Furthermore, this research aimed to determine the effect of growing media types and doses of BA to increase the healthy shoots and to make the propagation of Raja bulu banana from corm pieces faster. Research used Randomize Complete Block Design (RKLT) with two factors. The first factor were cytokines (BA) with four dosages (A1:10 ppm, A2:10 ppm, A3:20 ppm, and A4:30 ppm). The second factor was growing media composition consisting of B1: soil, B2: husk charcoal, B3: husk charcoal + soil, B4: and husk charcoal + cow manure. The results showed that no interaction between media and cytocines, except from dead corm percentage at 9 weeks after planting. The media's treatment only affected the variable number of buds on the hump, number of roots, number of root corms, number of roots of the root corms, and the dead corm percentage. The most number of buds on the hump was obtained from the husk charcoal + cow manure media at 2 weeks after planting. The highest of roots on 9 weeks after planting, the highest of root corms on 7 weeks after planting, and the highest of roots of the root corms on 9 weeks after planting were obtained from the husk charcoal media. The highest dead corm percentage was obtained from the soil media at 9 weeks after planting. Cytokines BA did have no significant influence to plantain bud multiplication of Raja bulu banana from corm pieces.The pests and diseases in the soil were reduced by using of husk charcoal + cow manure media. Hence, it was suggested to use husk charcoal + cow manure media without application of cytokines to produce Raja bulu banana’s shoots.
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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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