Judul: The  Effect  of  lime,  Gliricidia  maculata  (H.  B.  K)  Leaves  and Soybean  curd  sludge  (SCS)  Addition  on  The Quality  of  Vermicompost Medium  Chicken  Manure Mixed with  Rice  Straw.
Abstrak: Application of agricultural intensification on the lack of land due to increasing human population could decreased organic matter so that land productivity also decreased. The decreasing of organic matter can be pusshed by adding organic matter into the soil using any kind of waste product, such as plants, manure etc. as organic amelioration which produced by composting. With the development of biotechnology. now composting technic can be improved by vermicomposting namely; composting organic matter technic by the help of earthworm. One of orgnic matter that can be use in vemicomposting is chicken manure. Fresh chicken manure contain significant amounts of inorganic salt and ammonia which may kill earthworm, but after removal of these materials or mixed it with another organic matter, earthworm can grow well and produce compost with high nutrient. The purpose of this research is to learn about the effect additional of lime. laves of Gliricidia maculata (H.B.K) and soybean curd sludge (SCS) on the quality of vermicompost with medium chicken manure mixed with rice straw. This research was conducted in Soil Physics and Conservation Laboratory. Soil Science Departement, Faculty of Agriculture, Bogor Agriculture University. from Allgust to December 2000. Analysis of chemical, physical and biological vermicompost were conducted in Chemical and Soil Fertility Laboratory. Soil Physics and Conservation Laboratory, and Soil Biology Laboratory. Soil Science DepartemenL Faculty of Agriculture, Bogor Agriculture University. This research used completely randomize designed experiment with 10 treatments. namely AOPO (without lime + without leaves of Gliricidia maculala (H.B.K) and soybean curd sludge (SCS», AOPI {without lime + 5% of soybean curd sludge (SCS»). AOP2 (without lime + 10% of soybean curd sludge (SCS)). AOP3 (without lime + 5% of Gliricidia sp. leaves). AOP4 (without lime + 10% of Gliricidia sp. leaves). AIPO (l % of lime + without leaves of Gliricidia maculala (H.B.K) and soybean curd sludge (SCS», Al PI (l % of lime + 5% of soybean curd sludge (SCS». AIP2 (1% of lime + 10% of soybean curd sludge (SCS», AIP3 (1% of lime + 5% of Gliricidia sp. leaves) and Al P4 (1 % of lime + 10% of Gliricidia sp. leaves). with 3 repetition of each treatment, so there were 30 sets of experiment.
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Judul: The Effect of Sheep Manure and B8 Decomposer on Compost Quality
Abstrak: Bahan organik mempengaruhi sifat fisik, kimia, dan biologi tanah, sehingga dapat menjaga fungsi tanah sebagai media pertumbuhan tanaman. Jerami padi, brangkasan jagung dan batang pisang merupakan limbah pertanian yang potensial untuk dijadikan bahan utama pembuatan kompos. Kualitas bahan kompos menentukan laju dekomposisi bahan kompos. Dalam proses pengomposan sering ditambahkan dekomposer, sebagai agen untuk mempercepat proses dekomposisi. Tujuan percobaan pengomposan ini adalah untuk mempelajari pengaruh kotoran domba dan pengurai B8 terhadap kualitas kompos dari jerami padi, brangkasan jagung, dan batang pisang. Percobaan dilakukan di Kebun Percobaan Cikabayan IPB, Dramaga Bogor. Proses pengomposan dilakukan secara aerob. Seberat 15 kg bahan campuran jerami padi, brangkasan jagung dan batang pisang dengan perbandingan 2:2:1 digunakan untuk bahan utama pengomposan untuk setiap satuan percobaan. Perlakuan percobaan pengomposan meliputi kontrol (tanpa kotoran domba dan B8), standar (ditambah 3 kg kotoran domba, tanpa B8), D1 (tanpa kotoran domba, ditambah B8 25 ml), D2 (tanpa kotoran domba, ditambah B8 50 ml), DoD1 (ditambah 3 kg kotoran domba dan B8 25 ml), dan DoD2 (ditambah 3 kg kotoran domba dan B8 50 ml). Semua perlakuan ditambahkan 300 g urea, dibasahi, dibalik dan diaduk setiap 3 minggu. Tumpukan kompos dipertahankan lembabannya selama proses pengomposan. Pengamatan suhu kompos dilakukan setiap minggu mulai minggu ke-1 hingga minggu ke-12 dengan menancapkan termometer kompos ke dalam tumpukan kompos. Pengambilan contoh kompos dilakukan pada 0, 4, 8, dan 12 minggu pengomposan. Uji kualitas kompos didasarkan pada sifat kimiawi kompos yang meliputi kadar C-organik, N, dan S. Hasil percobaan menunjukkan bahwa perlakuan kotoran domba dan dekomposer B8 berpengaruh nyata terhadap kadar N, kadar S, nisbah C/N dan C/S, tetapi tidak berpengaruh nyata terhadap kadar C organik. Kualitas kompos terbaik ditemukan pada perlakuan DoD2 dengan nilai C-organik 29,9%, kadar N 1,9%, kadar S 1,2%, nisbah C/N 16,1, dan nisbah C/S 24,7, meskipun secara statistik perlakuan DoD2 dan DoD1 tidak berbeda nyata. Kata kunci : Nisbah C/N, dekomposisi, unsur hara, kompos, Organic matter affects the physical, chemical, and biological properties of the soil, therefore it can maintain soil function as a medium for plant growth. Rice straw, corn stover and banana stalks are potential agricultural waste to be used as the main material for composting. The quality of the compost material determines the rate of decomposition of the compost material. In the composting process, a decomposer is often added, as an agent to speed up the decomposition process. The purpose of this composting trial was to study the effect of sheep dung and decomposer B8 on the quality of compost from rice straw, corn stover, and banana stalks. The trial was carried out at the Cikabayan Experimental Station IPB, Dramaga Bogor. The composting process is carried out aerobically. A mixture of 15 kg of rice straw, corn stalk and banana stalks with a ratio of 2: 2: 1 is used for the main composting material for each trial unit. The trial treatments were Control (without sheep dung and B8), Standard (added 3kg sheep dung, without B8), D1 (without sheep dung but added B8 25 ml), D2 (without sheep dung but added B8 50 ml) , DoD1 (added 3 kg sheep dung
Keyword: C/N ratio, decomposition, nutrients, compost

Judul: Penghitungan Nilai Resistor Pengganti Menggunakan Nilai Eigen dan Vektor Eigen Ortonormal dari Matriks Laplace
Abstrak: Nilai resistor pengganti dapat dihitung dengan menggunakan nilai-nilai eigen dan vektor-vektor eigen ortonormal dari matriks Laplace yang diperoleh dari hubungan suatu gambar jaringan resistor dalam bentuk graf. Karena matriks Laplace adalah suatu matriks Hermite yang real dan simetrik, juga merupakan matriks semidefinit positif maka nilai-nilai eigen dari matriks Laplace adalah real taknegatif dan vektor-vektor eigennya adalah real yang saling ortogonal. Dalam tulisan karya ilmiah ini dibahas lima bentuk jaringan resistor (resistors network) yang hingga dalam bentuk graf : 1. Jaringan resistansi dua-simpul. 2. Jaringan satu dimensi dengan kondisi batas bebas. 3. Jaringan satu dimensi dengan kondisi batas periodik. 4. Jaringan dua dimensi dengan kondisi batas bebas. 5. Jaringan dua dimensi dengan kondisi batas silindrik.
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