Judul: Uji pengawetan terhadap daya simpan bahan tanam stek rumput gajah (Pennisetum purpureum Schummach)
Abstrak: Raising elephant grass (Pennisetum purpureum Schummach) generally use the cuttings vegetative planting material. Breeding by generative (seeds) can not be done because of infertility. Breeders or elephant grass cuttings manufactures still can not distribute more than a week, because it is easily damaged by external factors such as microbes and fungi. Therefor it is necessary that both storages methods cuttings that have a longer shelf life. The aim of this study was to determine the materials and tools that can extend the life of old cuttings and determine the shelf life is best for planting material cuttings of elephant grass. Experimental design used was completely randomized design (CRD) factorial with repeated 5 times. A factor is a preservation treatment is 4 types of materials or equipment that is preservative 2% liquid sugar, liquid wax, silica gel, an refrigerator (4 oC) and factor B are 5 levels of storage time of 3, 6, 9, 12, and 15 days. The materials used are cutting grass counted 625 pieces of cuttings. The variables measured were the general state of cuttings, weight decrease, early growth after planting, growing power, and vertical height. Results showed that the real interaction (P<0,05) the weight decrease significant cuttings between the used of preservatives with storage time, the interaction occurs in sugar preservatives, silica gel and control. the interaction showed a point of intersection between the sugar, silica gel and control over storage time chart at approximately 13 days. Intersection indicates that the maximum point of planting cuttings storage materials are given preservative sugar, silica gel, and control is about 13 days. Storage time significantly (P<0,05) the ability of grow, where teh storage time of 15 day showed a significant reduction in the growth of storage longer than others. Preservative retention and significantly (P<0,05) to the vertical height, where the storage time of 15 day showed higher average vertical drop significantly and the average height of the highest vertical is when using wax and sugar preservatives. The conclusion of this study is the shelf life cuttings of elephant grass (Pennisetum purpureum Schummach) can be improved by using sugar preservatives, silica gel, wax, and refrigerator at 4 oC for 15 days storage time and quality is good for 15 days of shelf life that is using a refrigerator at 4 oC.
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Judul: Pengaruh perlakuan dosis pupuk kandang dan interval pemotongan terhadap produktivitas rumput gaajah (Pennisetum purpureum Schum) pada tanah latosol Darmaga
Abstrak: Rumput Gajah atau Pennisetum purpureum merupakan salah satu jenis hijauan makanan ternak unggul yang sesuai untuk rumput potongan, dapat berproduksi tinggi, kualitasnya baik dan daya adaptasinya cukup luas. Untuk menyediakan hijauan makanan ternak secara efisien dan kontinyu dengan kualitas yang baik khususnya pada usaha peternakan yang bertumpu pada lahan marjinal yang dicirikan oleh kandungan unsur hara, dan bahan organik rendah, maka perlu dilakukan upaya salah satunya adalah manajemen yang baik seperti: pemilihan jenis hijauan makanan yang unggul, pengaturan defoliasi dan pengendalian kesuburan tanah tempat hijauan tersebut tumbuh. Tujuan penelitian ini adalah untuk mengetahui dosis pupuk kandang yang optimal dan interval pemotongan yang baik untuk mencapai produktivitas yang tinggi. Penelitian ini dilaksanakan mulai bulan Maret sampai bulan Oktober 1999 di Laboratorium Lapang Fakultas Peternakan IPB, Bogor. Materi yang digunakan adalah stek rumput Gajah, pupuk kandang sapi, pupuk urea, pupuk SP-36% dan KCI. Media tanam yang digunakan adalah jenis tanah Latosol yang terdapat di laboratorium lapang Fakultas Peternakan IPB, Darmaga, Bogor. Parameter yang diukur adalah pertambahan tinggi vertikal, pertambahan jumlah anakan, rasio bahan kering daun-batang serta produksi bahan kering kumulatif. Rancangan percobaan yang digunakan adalah Rancangan Petak Terbagi 3X3 dengan ulangan sebanyak 3 kali yang berlaku sebagai kelompok. Hasil penelitian memperlihatkan bahwa perlakuan pupuk kandang berpengaruh sangat nyata (p<0,01) terhadap rataan pertambahan jumlah anakan. Perlakuan interval pemotongan berpengaruh sangat nyata (p<0,01) terhadap rasio berat kering daun-batang dan pertambahan tinggi vertikal. Dari hasil penelitian ini diambil kesimpulan bahwa perlakuan interval pemotongan lebih dominan memberikan respon pada tanaman rumput Gajah dibandingkan dengan perlakuan dosis pupuk kandang pada tanah latosol.
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Judul: Penyelesaian Masalah Rotasi Aliran Fluida Kental Von Karman Menggunakan Metode Homotopi
Abstrak: Von Karman equation is an equation that describes fluid viscous flow induced by infinite disk rotation. By assuming steady flow and laminar, viscous incompressible fluid flow is represented in Von Karman equation by an angular velocity and the vertical direction velocity as the independent variables. Von Karman equation is a nonlinear problem that is solved using the homotopy method. The use of homotopy method is done by defining an homotopy function that requires auxiliary parameters to control the convergent region of the solution. The solution is a recursive formula with given initial conditions. Using software based-functional shows that velocity components converge to a value.
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