Judul: Penggunaan vermikompos dan pupuk NPK untuk perbaikan beberapa sifat fisik dan kimia tanah latosol Darmaga (Oxic dystropept) serta kualitas pertumbuhan rumput bermuda (Cynodon daetylon) varietas evergreen
Abstrak: Penelitian ini bertujuan untuk melihat pengaruh pemberian bahan organik yang berupa vermikompos dan pupuk anorganik NPK (15-15-15) terhadap sifat fisik tanah, sefat kimia tanah, serta kualitas pertumbuhan rumput bermuda (Cynodon dactylon varietas Evergreen pada tanah Latosol Darmaga (Oxic Dystropept). karya Penelitian ini dilaksanakan di areal kebun percobaan Cikabayan, Darmaga, Bogor sejak bulan November 1996 sampai bulan April 1997. Analisa sifat fisik dan kimia tanah dilaksanakan di Laboratorium Jurusan Tanah, Fakultas Pertanian, IPB. Petak penelitian yang digunakan sebanyak 18 petak dengan luas masing- masing 2 m x 5 m. Masing-masing petak dibatasi dengan tali tambang dengan jarak antar petak 25 cm. Bahan organik yang digunakan adalah vermikompos, dan pupuk anorganik yang digunakan adalah pupuk NPK (15-15-15). Tanaman yang digunakan adalah rumput bermuda (Cynodon dactylon) var. Evergreen. kan sumbe Sebelumnya campuran antara vermikompos dan pupuk NPK diinkubasi selama 1 minggu sebelum ditaburkan ke lahan rumput. Lahan yang telah ditanami rumput bermuda (Cynodon dactylon) var. Evergreen kemudian ditaburi dengan campuran vermikompos dan pupuk NPK secara merata di atas permukaan tanah (topdressing) pada masing-masing perlakuan di setiap petak yang telah disiapkan. Penelitian ini dilaksanakan selama 2 tahap (1 tahap selama 7 minggu) Perlakuan yang diuji merupakan kombinasi dari dua macam perlakuan yaitu pemberian dosis vermikompos (K) yang terdiri dari 3 taraf dosis yaitu 0 ton/ha (K0), 2 ton/ha (K1), dan 4 ton/ha (K2). Pemberian dosis pupuk NPK (15-15-15) (P) terdiri dari 2 taraf dosis yaitu: 50 kg/ha (P1) dan 100 kg/ha (P2). ...
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Judul: Pengaruh pengolahan tanah, residu pupuk kandang dan strip rumput vetiver terhadap beberapa sifat fisik dan c-organik tanah serta produksi jagung (Zea mays) pada latosol coklat kemerahan (Typic Dystropept) di Desa Cikeas, Bogor
Abstrak: Pengolahan tanah konservasi dengan mengurangi pengolahan tanah setiap kali melakukan kegiatan pertanian, penggunaan strip rumput Vetiver dan pemberian bahan organik dapat memperbaiki atau mempertahankan sifat tanah. Penelitian ini bertujuan untuk mengetahui pengaruh pengolahan tanah, strip rumput Vetiver dan residu pupuk kandang terhadap beberapa sifat fisik tanah dan C- organik serta produksi jagung. Penelitian ini merupakan penelitian lanjutan dari masa tanam pertama pada bulan Nopember 1991 Maret 1992 dengan komoditi jahe (Zingiber officinale - ROSC). Penelitian lapangan berlokasi di Desa Cikeas, Kecamatan Kedung Halang, Kabupaten Bogor, pada ketinggian 250 m diatas permukaan laut. Percobaan dilakukan pada jenis tanah Latosol Coklat Kemerahan (Typic Dystropept) dengan kemiring- an lereng 16%. Penanaman jagung dilakukan pada bulan Nopember 1992 Pebruari 1993. Rancangan percobaan yang digunakan adalah Rancangan Acak Lengkap Faktorial dengan 3 variabel. Variabel pertama adalah residu pupuk kandang yang diberikan masa tanam pertama dalam dalam jalur-jalur setiap 60 cm, terdapat 4 taraf (PO = 0 ton/ha, P1 = 15 ton/ha, P2 = 30 ton/ha dan P4 = 45 ton/ha). Variabel kedua adalah pengolahan tanah; 00 tidak diolah dan 01 diolah, dan variabel ketiga adalah penggunaan strip rumput Vetiver; V0 tanpa strip rumput dan V1 = dua baris strip rumput…dst
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Judul: Algorithm construction of HLI hash function
Abstrak: Cryptography is a study of mathematical techniques related to aspects of information security regarding on confidentiality, data integrity, entity authentication, and data origin authentication. Data integrity is a service, which is associated with the conversion of data carried out by unauthorized parties. To maintain data integrity, one can use hash functions. An hash function is a computationally efficient function to map an arbitrary length bitstring to a fixed length bitstring called as hash value. The use of hash function in maintaining the information integrity and authentication is in digital signatures, virus protection, and software distribution. Illustration of the hash function in the integrity and authentication of information that is emailed as follow. The sender sends the information and hash value to the recipient. If the hash value of the information is equal to the hash value that is sent by the sender, then information has not been changed. Otherwise the information has been changed. An hash function has two properties, one way and collision resistance. An hash function is called one way if it is computationally infeasible to find any input such that when given any hash value . Meanwhile an hash function is called collision resistant if it is computationally infeasible to find any two inputs where such that . The purpose of this study is to construct a HLI hash function algorithm, to analyze the speed and security of the hash functions as a results of construction. Furthermore, it is to compare it with SWIFFT. Hash function is constructed based on the result of algebraic operations on modular polynomial ringwith . Modular polynomial ring noted as is a set of all polynomials of degree at most with coefficients in . can be represented as a set of integer vector of modulo in dimension . So, it is simple to implement in a computer. In vector operations, is lattice . Furthermore, alattice that is defined from certain polynomial ring is called ideal lattice. HLI hash function is consists of addition and multiplication algorithm in the ring. Addition algorithm consists of sumation operations of modulo and multiplication consists of multiplication operations of modulo . Generally, algorithm of HLI hash function consists of multiplication operations of modulo and addition operations of modulo . However, if the input is binary number then multiplication algorithm only consists of multiplication operation of modulo , so algorithm of HLI hash function consists of multiplication operations of modulo and addtion operations of modulo . An hash function is secured if it has two properties, i.e., one way and collision resistance. HLI hash function hash is one way, it is following the proof of Micciancio. It is has collision resistant because of polynomial is irreducible over and monic. Moreover, it is proved that for every unit vector , the vector is small vector. If the input of hash function is a binary number then HLI hash function only involves addition operations of modulo . So the time that used almost same with SWIFFT. The excellence of HLI hash function is the key size smaller than SWIFFT. This effect on
Keyword: hash function, modular polynomial ring, lattice