Judul: Kemungkinan penggunaan NaC1 untuk pemupukan tanaman karet muda
Abstrak: Penelitian bertujuan menjajaki kemungkinan peng­ gunaan NaCl (garam dapur) untuk pemupukan tanaman karet muda. Penjajakan dipusatkan terhadap dua hal yaitu (a) apakah NaCl dapat mengganti sebagian kekurangan KCl, dan (b) apakah NaCl dapat digunakan sebagai pupuk tambahan untuk memperbaiki pertumbuhan tanaman karet walaupun K cukup ? Percobaan dilakukan dengan pertanaman di kantong plastik masing-masing diisi 25 kg tanah berasal dari kebun percobaan Ciomas, BPP Begor, dan menggunakan bahan tanaman semaian klon GT-1. Bahan tanaman berumur kurang lebih satu setengah tahun, dipotong puda ke­ tinggian 15 cm, lalu ditunaskan dan kemudian dipilih berdasarkan urnur, tinggi tanaman, diameter batang pada ketinggian lima centimeter dari pangkal tunas, dan kon­ disi tanaman secara visual untuk keseragaman bahan percobaan pada waktu tunas berumur sekitar 75 hari.
Keyword: Stimulating effect;, Avena sativa;, Triticum aestivum;, Cammelina community;, Bogor Agricultural University;

Judul: The Effectiveness of Ammonium Chloride Addition with Different Potassium Sources on the Growth and Yield of Sweet Corn (Zea mays saccharata Sturt)
Abstrak: Pertambahan jumlah penduduk di Indonesia akan berdampak pada peningkatan permintaan produksi pertanian. Produktivitas yang tinggi dapat dicapai melalui pemenuhan kebutuhan hara tanaman terutama unsur nitrogen (N). Pupuk urea banyak digunakan di Indonesia, dan permintaannya diperkirakan meningkat di masa mendatang. Oleh karena itu perlu dicari sumber pupuk N lainnya sebagai alternatif pelengkap urea. Amonium klorida (NH4Cl) merupakan produk sampingan yang dihasilkan pada industri soda ash. Senyawa ini mengandung 25% N merupakan alternatif sumber N bagi tanaman. Unsur ikutannya yaitu klor (Cl) memiliki persentase yang signifikan sehingga dikuatirkan mempengaruhi pertumbuhan tanaman. Penelitian ini dilakukan dengan percobaan lapangan menggunakan tanaman jagung manis dan bertujuan mempelajari pengaruh pemberian amonium klorida yang dikombinasikan dengan sumber kalium (K) yang berbeda terhadap pertumbuhan, produksi, dan serapan N dan Cl jagung manis. Selain itu dilakukan percobaan inkubasi tanah untuk mempelajari pengaruhnya pada pH tanah, kadar N tersedia, N total dan Cl tersedia tanah. Percobaan lapangan dilaksanakan di Kebun Pendidikan Cikabayan, Kampus IPB Darmaga dan percobaan inkubasi tanah dilakukan di Laboratorium Kesuburan Tanah, Dep. Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB. Percobaan lapangan dirancang secara acak kelompok dengan sembilan perlakuan yang terdiri dari 0%, 100%, 150%, dan 200% N yang dikombinasikan dengan sumber K dari KCl dan K2SO4. Sebagai pembanding sumber N adalah urea dengan dosis 100% N selanjutnya disebut sebagai perlakuan N standar. Parameter yang diamati yaitu tinggi, bobot tongkol dan brangkasan tanaman, dan serapan N dan Cl bagian biji, daun dan batang. Percobaan inkubasi tanah dirancang secara acak lengkap dengan perlakuan yang sama seperti percobaan lapangan. Parameter yang diamati yaitu pH tanah dan N-tersedia pada waktu inkubasi 15, 30 dan 45 hari, N total tanah dan Cl tersedia tanah pada akhir masa inkubasi tanah. Hasil percobaan lapangan menunjukkan pemberian amonium klorida dikombinasikan dengan sumber K yang berbeda berpengaruh nyata terhadap tinggi, bobot tongkol dan brangkasan tanaman, dan serapan N dan Cl jagung manis dibandingkan kontrol. Perlakuan N-amonium klorida dengan KCl maupun K2SO4 tidak menunjukkan perbedaan yang nyata terhadap pertumbuhan dan produksi tanaman dibandingkan N standar. Perlakuan dosis N tidak menunjukkan perbedaan nyata terhadap pertumbuhan dan produksi tanaman. Hasil percobaan inkubasi tanah menunjukkan perlakuan amonium klorida tidak menunjukkan perbedaan yang nyata pada kadar N tersedia, N total, dan Cl tersedia dibandingkan dengan kontrol namun nyata menurunkan pH tanah pada waktu inkubasi 45 hari dibandingkan dengan kontrol., The growing population in Indonesia will have implications to the rising demand for agricultural production. High productivity can be achieved by meeting the needs of plants for nutrients, especially nitrogen (N). In Indonesia, urea fertilizer is widely used, and it is predicted that demand will rise in the coming years. Therefore, it is necessary to search for other types of N fertilizer as a complementary alternative to urea. Ammonium chloride (NH4Cl) is a by product in the soda ash industry. This substance containing 25% N is an alternative source of N for plants, but it also contains a significant amount of Chlorine (Cl), raising concern that it might influence plant growth. This study was conducted as field experiments using sweet corn plants. The aim of this research was to study addition of ammonium
Keyword: produktivitas, produk sampingan, pupuk nitrogen, serapan hara, soda ash

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