Judul: Pencucian Pupuk Majemuk Phonska serta Pengaruhnya terhadap Pertumbuhan dan Produksi Bayam (Anmranthzis tricolor. L) pada Inceptisol (Oxic Dyslrtidept) Darmaga dan Vertisol (Chromic Dyslrudert) Cihea.
Abstrak: Pemberian air yang melebihi kemampuan tanah menahan air ke dalam tanah perlu dipelajari untuk mendapatkan informasi mengenai pencucian (perkolasi) yang membawa unsur-unsur hara terutama N, P, K. Pencucian unsur hara merupakan salah satu kendala utama ketersediaan hara bagi tanah dan tanaman, khususnya pertumbuhan dan produksi tanaman. Faktor-faktor yang mempengaruhi pencucian hara diantaranya adalah volume pemberian air, mobilitas hara, adsorpsi tanah dan sifat tanah. Penelitian ini bertujuan untuk mempelajari pengaruh interaksi jenis tanah dan volume pemberian air terhadap pencucian hara N, P, K, pertumbuhan serta produksi bayam.
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Judul: Meningkatkan efektifitas pupuk majemuk phonska untuk pertanaman bayam, Amaranthus tricolor L. dengan bahan organik pada latosol Darmaga
Abstrak: Untuk memenuhi kebutuhan unsur hara bagi tanaman perlu adanya penambahan hara melalui pemupukan. Ada kalanya pemberian pupuk ini menjadi tidak efisien karena adanya pencucian akibat kelebihan air baik dari hujan maupun kelebihan pemberian air. Untuk mengurangi tingkat pencucian maka diperlukan pemberian amelioran. Penelitian ini bertujuan untuk meningkatkan efektifitas pupuk majemuk PHONSKA pada tanah Latosol Dermaga sebagai akibat pemberian kompos dan eir di atas kader air kapasitas lapang. Rancangan yang digunakan dalam penelitian ini adalah Rancangan Acak Lengkap (RAL) Faktorial, yang terdiri dari dua faktor. Faktor ke satu adalah pemberian kompos yang terdiri dari 0 ton/ha (KO), 10 ton/ha (KI), 20 ton/ha (K2) dan faktor ke dua adalah perlakuan pemberian air yang terdiri dari 100 % Kadar Air Kapasitas Lapang (KAKL) (A1), 120 % KAKL (A2), 140 % KAKL (A3), 160 KAKL (A4). Dengan demikian terdapat 12 kombinasi perlakuan yang diulang sebanyak 3 kali sehingga didapatkan 36 satuan percobaan. Hasil penelitian menunjukkan bahwa penggunaan kompos nyata. menurunkan total pencucian N dan P tetapi meningkatkan total pencucian K dan produksi bayam, sedangkan pemberian air di atas kapasitas lapang nyata meningkatkan total pencucian N, P dan K tetapi menurunkan produksi bayan. Interaksi antara penggunaan kompos dan pemberian air di atas kapasitas lapang menunjukkan bahwa efektifitas pupuk PHONSKA untuk tanaman bayam akan meningkat dengan pemberian kompos sampai 20 ton/ha, apabila pemberian air hanya sampai 100 % KAKL. Efektifitas pupuk PHONSKA pada tanaman bayam akan menurun dengan meningkatnya pemberian air melebihi 100 % KAKL pada setiap level pemberian kompos.
Keyword: Pupuk organik, Tanah latosol

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