Judul: Pengaruh zeolit terhadap ketersediaan nitrogen pada tanah sawah dan pengambilan N oleh tanaman padi (Oryza sativa L.) varietas IR-64
Abstrak: Penelitian ini dilaksanakan di rumah kaca dan laboratorium Jurusan Tanah, Fakultas Pertanian, Institut Pertanian Bogor. Penelitian ini bertujuan untuk mengevaluasi kemampuan mineral zeolit sebagai pelepas lambat hara nitrogen dan pengaruhnya terhadap pangambilan nitrogen oleh tanaman padi. Tanah yang digunakan adalah tanah sawah Regosol Sindang barang dan mineral zeolit Cikembar. Rancangan yang digunakan adalah Rancangan Acak Lengkap 2 Faktor dengan faktor pertama adalah 3 taraf pupuk nitrogen (U) yaitu U1, U2, U3 (50, 100, 150) kg/ha. Faktor kedua adalah zeolit (Z) yang diberikan dalam 4 taraf yaitu 20, 21, 22, 23 (0, 3.5, 7.0, 10.5) ton/ha, sehingga terdapat 12 perlakuan, dengan 3 ulangan pada masing-masing perlakuan. Keseluruhannya terdapat 36 satuan percobaan. Pupuk dasar yang digunakan adalah TSP dan KC1. Penelitian ini dilaksanakan dari bulan Maret sampai Juli 1995. Untuk mengetahui pengaruh perlakuan, dilakukan pengamatan terhadap pertumbuhan dan produksi tanaman padi. Parameter yang diamati adalah tinggi tanaman, jumlah anakan, jumlah anakan produktif, bobot gabah/pot, bobot kering jerami. Analisa sifat kimia tanah setelah panen meliputi PH H20, amonium dan nitrat tanah dan basa-basa tersedia yaitu: K, Na, Ca, Mg dan untuk mengetahui kandungan nitrogen tanaman dilakukan analisis jaringan tanaman. ...
Keyword: 

Judul: Pengaruh enam sumber pupuk nitrogen terhadap pertumbuhan, hasil gabah dan efisiensi serapan nitrogen padi varietas IR-64 pada latosol Muara, Bogor
Abstrak: Penelitian dilaksanakan di kebun Percobaan Balai Penelitian Tanaman Pangan Muara, Bogor, sedangkan analisa tanah dan tanaman dilakukan di Laboratorium Sub Kelompok Peneliti Fisiologi Hara Tanaman Balai Penelitian Sindang Barang, Bogor. Tanaman Pangan. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) dengan tujuh perlakuan dimana masing-masing perlakuan terdiri dari empat blok. Sumber pupuk N yang digunakan adalah urea prill furea butiran), Urea Super Granul (USG), Sulfur Coated Urea (SCU), urea briket, Paper Coated Urea (PCU) dan urea cair dengan dosis masing-masing 100 kg N per ha. Sebagai pupuk dasar digunakan TSP, KCl dan Zn dengan dosis 100 kg P205 untuk TSP, 100 kg K20 untuk KC1 dan konsentrasi 2 persen dalam satu liter air untuk ZnO vang diberikan secara dipping. ...
Keyword: 

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