Judul: Respon Morfologi dan Fisiologi Tanaman Tebu (Saccharum officinarum L.) pada Kondisi Cekaman Kekeringan dengan Pemberian Pupuk Organik
Abstrak: Penanaman tebu (Saccharum officinarum L.) di lahan kering mengalami hambatan dalam pembudidayaannya yaitu ketersediaan air yang terbatas. Ketersediaan air di lahan kering mengandalkan hujan untuk irigasi tanaman tebu. Oleh karena itu, cekaman kekeringan pada tanaman tebu selalu terjadi pada fase awal pertumbuhan sehingga dapat menurunkan baik produksi maupun produktivitas. Pupuk organik dapat menjadi solusi dalam membantu tanaman untuk bertahan pada kondisi cekaman kekeringan yang diharapkan dapat mempertahankan baik produksi maupun produktivitas tanaman selama cekaman kekeringan. Penelitian bertujuan untuk mengetahui pengaruh pupuk organik terhadap respon morfologi dan fisiologis tebu di bawah cekaman kekeringan pada fase awal pertumbuhan. Percobaan dilakukan di rumah kaca Kebun Percobaan Cikabayan, Institut Pertanian Bogor-Dramaga pada April - Juli 2019. Penelitian menggunakan stek batang satu tunas (bud chip) yang disusun dengan Rancangan Acak Lengkap dua faktor. Faktor pertama adalah kombinasi pupuk organik dan anorganik terdiri atas 100% organik, 75% organik + 25% anorganik, 50% organik+ 50% anorganik, 25% organik + 75% anorganik dan 100% anorganik. Faktor kedua adalah taraf irigasi yaitu 100% kapasitas lapangan dan 60% kapasitas lapangan (cekaman kekeringan). Hasil penelitian menunjukkan bahwa kombinasi pupuk organik-anorganik tidak berpengaruh nyata terhadap peubah-peubah yang diamati kecuali luas daun dan kadar gula daun. Terdapat pola yang serupa diantara peubah-peubah morfologi dan fisiologi dalam merespon pupuk 50% organik + 50% anorganik, yaitu menunjukkan nilai tertinggi dibandingkan dengan pupuk lainnya. Cekaman kekeringan pada 60% kapasitas lapang secara signifikan menurunkan pertumbuhan tanaman tebu berdasarkan respon morfologi dan fisiologi tanaman tebu. Terdapat interaksi antara perlakuan kombinasi pupuk organik-anorganik dan taraf irigasi terhadap tinggi tanaman, jumlah daun dan kadar gula daun. Kombinasi pupuk 50% organik + 50% anorganik dapat mempertahankan tinggi tanaman, jumlah daun dan kadar gula daun pada kondisi tercekam kekeringan di fase awal pertumbuhan.
Keyword: Cekaman abiotik, fisiologi, kualitas tanah, lahan kering, morfologi

Judul: Pengujian berbagai formulasi pupuk majemuk terhadap pertumbuhan tanaman tebu (Saccharum officinarum L.) di Lahan Kering
Abstrak: Tebu (Saccharum officinarum L.) adalah tanaman bahan baku gula. Tebu adalah tanaman golongan C4 yang memerlukan radiasi surya penuh, dan kecukupan unsure hara berimbang. Tujuan penelitian ini untuk mempelajari respon aplikasi berbagai formulasi pupuk majemuk terhadap pertumbuhan tanaman tebu di lahan kering.Penelitian ini dilaksanakan di Kebun Tebu milik PG Madukismo Rayon Purworejo, di daerah pesisir pantai ketawang pada bulan Agustus 2016 sampai Januari 2017. Rancangan yang digunakan adalah rancangan Kelompok Lengkap Teracak (RKLT). Dengan 3 perlakuan, Perlakuan pertama (kontrol) dosis pupuk NPK Phonska 500 kg/ha danZA 500 kg/ha. Perlakuan kedua dosis pupuk NPK Mutiara 470 kg/ha dan ZA500 kg/ha, perlakuan ketiga dosis pupuk NPK Halei 900 kg/ha. PerlakuanPetak percobaan terdiri dari 45 juringan yang diamati. Hasil penelitian menunjukkan perlakuan pupuk NPK Mutiara (16-16-16) memberikan hasil tertinggi terhadap peubah tinggi tanaman, jumlah anakan, keliling batang, luas penampang daun, dan produktivitas tanaman yang di ujikan.
Keyword: inorganic fertilizer, dry land, taxation, sugar cane

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