Judul: Pengaruh pemupukan fosfor dan kalium terhadap pertumbuhan dan produksi tanaman padi gogo varietas C-22 pada tanah podsolik merah kuning dari baturaja sumatra selatan
Abstrak: Percobaan ini bertujuan untuk mengetahui pengaruh pemu- pukan fosfor dan kalium terhadap pertumbuhan dan produksi tanaman padi gogo pada tanah Podsolik Merah Kuning dari Ba- turaja, Sumatera Selatan. Sesuai dengan tujuan tersebut telah dilakukan percobaan pemupukan fosfor dan kalium masing-masing dengan tiga taraf yaitu 0, 200, dan 400 ppm P, dan 0, 150, dan 300 ppm K, pada tanah Podsolik Merah Kuning dari Baturaja. Tiap pot berisi empat kg tanah kering udara dengan dua tanaman. Tiap pot dipupuk dasar dengan pupuk Urea sebanyak 200 ppm N. Ran- cangan percobaan yang digunakan adalah Rancangan Acak Leng- kap Faktorial dengan tiga ulangan. Hasil percobaan menunjukkan, bahwa pemupukan fosfor berpengaruh sangat nyata terhadap tinggi tanaman ketika ber- umur 3, 5, 7, 9, 11, dan 13 minggu. Pemupukan kalium berpe- ngaruh nyata terhadap tinggi tanaman ketika berumur 5 dan 7 minggu, serta berpengaruh sangat nyata ketika tanaman beru- mur 11 minggu.
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Judul: Pengaruh pengapuran dan pemberian fosfor terhadap pertumbuhan, serapan beberapa unsur hara, dan produksi padi gogo pada podsolik merah kuning dari Jasinga
Abstrak: Jenis tanah utama dan terluas di Indonesia adalah Podsolik Merah Kuning. Tingginya Aluminum dan kekurangan Fosfor merupakan faktor pembatas utama bagi pertumbuhan tanaman pangan umumnya pada tanah tersebut. Tanaman padi yang merupakan tanamen utama sebagai bahan makanan pokok di Indonesia, membutuhkan hara Pre latif tinggi. Ketersediaan hara ini berhubungan erat dengan sifat kemasaman Podsolik Merah Kuning. Oleh karena itu produksi padi tanpa pemberian Fosfor selalu rendah, bahkan tidak berproduksi. Berangkat dari permasalahan tersebut dilakukanlah penelitian ini. Tujuannya, untuk mengetahui sampai sebe- rapa besar pengaruh pengapuran dan pemberian fosfor ter hadap pertumbuhan, serapan beberapa unsur hara, dan pro duksi padi gogo. Penelitian ini dilakukan dalam dua unit percobaan. Unit percobaan pertama bertujuan untuk mengetahui penga ruh pengapuran dan pemberian fosfor terhadap bobot kering tanaman dan serapan N, P, K, Ca, dan Mg tanaman sampai berumur 60 hari. Unit percobaan kedua bertujuan untuk me- ngetahui pengaruh pengapuran dan pemberian fosfor terhadap pertumbuhan dan produksi tanaman sampai kering panen. Sebanyak masing-masing 3 kg dan 6 kg tanah kering 105 °C dimasukkan ke dalam pot-pot plastik. Tiga takaran kapur dalam bentuk kapur teknikal setara 0.0, 1.0, dan 2.0 me Al-dd; serta tiga taraf 0.0, 150.0, dan 300.0 ppm P dalam bentuk H3PO4. Tanaman indikator yang digunakan ada- lah padi varietas IR-36…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