Judul: Pertumbuhan Bibit Pepaya pada Berbagai Komposisi Media Tanam
Abstrak: Pepaya merupakan buah tropika yang lebih efisien diperbanyak dengan biji. Media pembibitan yang biasa digunakan oleh petani pepaya adalah campuran tanah dan bahan organik yang berat, sehingga kurang praktis dalam transportasi dan distribusi bibit. Penelitian ini bertujuan untuk memperoleh media pembibitan yang ringan namun dapat mendukung pertumbuhan bibit pepaya hingga siap tanam di lapangan. Percobaan dilakukan dari bulan Januari sampai Juni 2013 di Kebun Percobaan Pusat Kajian Hortikultura Tropika IPB Pasirkuda Ciomas, Bogor, dengan rancangan kelompok lengkap teracak 1 faktor dan 3 ulangan. Perlakuannya adalah komposisi media tanam yang terdiri dari 3 jenis bahan dengan perbandingan volume 1:1:1 yaitu tanah + pupuk kandang ayam + arang sekam, tanah + pupuk kandang ayam + sekam, tanah + pupuk kandang ayam + cocopeat, tanah + pupuk kandang ayam + serbuk gergaji, tanah + kompos + arang sekam, tanah + kompos + sekam, tanah + kompos + cocopeat dan tanah + kompos + serbuk gergaji. Hasil percobaan menunjukkan bahwa komposisi media tanam mempengaruhi tinggi tanaman, jumlah daun, diameter batang dan waktu tunas bunga pertama muncul. Komposisi media tanam tanah + pupuk kandang ayam + sekam dan tanah + pupuk kandang ayam + cocopeat merupakan komposisi media tanam yang memiliki bobot bibit per polybag paling ringan dan memberikan pertumbuhan optimum pada bibit pepaya di polybag dan di lapangan. Komposisi media tanam tanah + pupuk kandang ayam + sekam memiliki biaya produksi yang lebih murah dibanding komposisi media tanam tanah + pupuk kandang ayam + cocopeat.
Keyword: arang sekam, cocopeat, pembibitan, pupuk kandang ayam, sekam

Judul: Pengaruh Komposisi Media Tanam Terhadap Bibit dan Pertumbuhan Awal Pepaya (Carica papaya L.) Tipe Bangkok dan California.
Abstrak: The objective of the research was to observed growing media with a light weight but still could support the seedling and initial growth of two types of papaya. The research was conducted at Cikabayan Experimental Field, Darmaga, Bogor, from May to October 2013. The experiments used two papaya types which were Bangkok and California and was arranged in Factorial Randomized Complete Block Design with one factor and three replications. The treatment was growing media composition which were a mix of soil, cattle manure, and rice husk charcoal with different ratio (ratio based on volume); M1 (2 :1:1) as a control, M2 (1:1:1), M3 (1:1:2), M4 (1:2:1), M5 (1:2:2), M6 (2:1:2), and M7 (2:2:1). The result showed that the growing media affected the weight of seedling and diameter of stem by the polybag of both types in the seedling phase at 5 Weeks After Planting (WAP), and also affected the height of plant at 1 and 2 WAP of Bangkok type. Growing media thas has light weight and was able to support the seedling’s growth was media M3, M4, and M5 for both Bangkok and California types, while the most economical was media M3. The composition of soil in the growing media can be reduced to only 1/5 part from the total volume of the media without inhibit the growth of the seedling. Growing media composition did not affected the height, number of leaf, diameter of stem, time of first flowering and height of the first flower bud in both Bangkok and California types in the field.
Keyword: cattle manure, economical, lighter media, rice husk charcoal

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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