Judul: Optimization of Spinach Fertilization Based on Soil Analysis Using Fertigation Through Drip Irrigation Systems
Abstrak: Pemupukan melalui irigasi tetes berdasarkan analisis tanah diharapkan dapat meningkatkan produktivitas bayam varietas Maestro. Penelitian dilaksanakan di Kebun Percobaan Cikarawang, Institut Pertanian Bogor dengan jenis tanah latosol, kandungan P-tersedia 3,9 ppm (sangat rendah), K-tersedia 40,2 ppm (sedang), C Organik 1,92%, dan pH 5,83. Penelitian ini bertujuan mendapatkan dosis rekomendasi pemupukan yang tepat untuk bayam berdasarkan hasil analisis tanah melalui sistem irigasi tetes dan menguji pengaruh potensi pupuk untuk dua kali tanam tanpa preplant dan fertigasi. Penelitian terdiri dari dua kali penanaman menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) faktor Tunggal dengan 5 ulangan dan 5 taraf pemupukan yaitu 0% X, 50% X, 100% X, 150% X, dan 200% X (X adalah rekomendasi berdasarkan program Ferads). Data dianalisis menggunakan uji-F dengan α 5% dan uji lanjut menggunakan analisis regresi. Hasil penelitian menunjukkan pada penanaman pertama didapatkan dosis optimum untuk bobot per bedeng marketable, bobot per bedeng total, perkiraan bobot panen per hektar marketable, dan perkiraan bobot panen per hektar total berturut-turut yaitu sebesar 151%, 133%, 135%, dan 132% dari dosis rekomendasi Ferads (219 kg N ha-1 , 274 kg P2O5 ha-1 , dan 149 kg K2O ha-1 ). Dosis 100% rekomendasi Ferads digunakan karena kenaikan hasil tidak signifikan meskipun diberikan dosis pupuk yang lebih tinggi. Dosis optimum tidak diperoleh pada penanaman kedua karena hasil analisis regresi tidak menunjukkan respon kuadratik. Residu pemupukan tidak mempengaruhi produksi bayam varietas Maestro secara keseluruhan sehingga analisis tanah perlu dilakukan di setiap musim tanam bayam., Fertilization through drip irrigation based on soil analysis is expected to increase the productivity of Maestro spinach varieties. The research was carried out at the Cikarawang Experimental Garden, Bogor Agricultural Institute with latosol soil type, P-available content of 3.9 ppm (very low), K-available 40.2 ppm (medium), C-Organic 1.92%, and pH 5 .83. This research aims to obtain the correct recommended dose of fertilizer for spinach based on the results of soil analysis using a drip irrigation system and testing the potential effect of fertilizer for two plantings without preplant and fertigation. The research consisted of two plantings using a single factor Randomized Complete Group Design (RKLT) with 5 replications and 5 levels of fertilization, namely 0% X, 50% X, 100% X, 150% X, and 200% X (X was a recommendation based on the Ferads program). Data were analyzed using F-test with α 5% and further testing using regression analysis. The results of the research showed that in the first planting, the optimum dose was obtained for weight per marketable bed, total weight per bed, estimated marketable harvest weight per hectare, and estimated total harvest weight per hectare respectively, namely 151%, 133%, 135%, and 132%. % of Ferads recommended dose (219 kg N ha-1 , 274 kg P2O5 ha-1 , and 149 kg K2O ha-1 ). The 100% dose recommended by Ferads was used because the increase in yield was not significant even though a higher fertilizer dose was given. The optimum dose was not obtained in the second planting because the results of the regression analysis did not show a quadratic response. Fertilizer residue does not affect the overall production of the Maestro spinach
Keyword: Ferads, fertigation, fertilizer dose, production, spinach

Judul: Optimizing Fertilizer Dosages in Water Spinach Cultivation Using Fertigation Through Drip Irrigation
Abstrak: Peningkatan produktivitas tanaman kangkung varietas Bangkok-LP1 dapat dilakukan dengan cara pemberian dosis pupuk yang optimum berdasarkan analisis tanah secara fertigasi melalui irigasi tetes. Penelitian ini bertujuan untuk mengetahui rekomendasi dosis pupuk yang tepat untuk tanaman kangkung sehingga mencapai produktivitas yang maksimal. Penelitian dilakukan mulai bulan Juli sampai Oktober 2023 di Kebun Percobaan Cikarawang, Institut Pertanian Bogor, yang memiliki jenis tanah inceptisol dengan kandungan C-Organik 1,38%, P-Tersedia 5,5 ppm (sangat rendah), K-Tersedia 33,1 ppm (rendah), dan pH 6,03 (masam). Penelitian ini menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) dengan satu faktor yaitu perlakuan 5 dosis pemupukan 0%X, 50%X, 100%X, 150%X, dan 200%X, dengan X adalah dosis 219 kg N ha-1, 374 kg P2O5 ha-1, 187 kg K2O ha-1 dengan 4 ulangan. Hasil penelitian menunjukkan bahwa aplikasi pemupukan menggunakan fertigasi melalui irigasi tetes sampai 200% rekomendasi Ferads tidak memberikan pengaruh yang nyata pada pertumbuhan dan produksi kangkung varietas Bangkok-LP1. Produktivitas kangkung varietas Bangkok-LP1 mencapai 13,64 ton ha-1 pada penanaman pertama, sedangkan pada penanaman kedua dengan residu pemupukan menghasilkan 12,33 ton ha-1., Increasing the productivity of the Bangkok-LP1 variety of water spinach plants can be done by providing optimum fertilizer rate based on soil analysis using fertigation through drip irrigation. This research aims to determine the recommended fertilizer rate for water spinach plants to achieve maximum yield. The research was conducted from July to October 2023 at the Cikarawang Experimental Station, Bogor Agricultural University, which has an inceptisol soil type with a C-Organic content of 1,38%, P-Available 5,5 ppm (very low), K-Available 33,1 ppm (low), and pH 6,03 (acid). This study used a Randomized Completely Block Design (RCBD) with one factor, with 5 level fertilizer rate of 0%X, 50%X, 100%X, 150%X, and 200%X, where 219 kg N ha-1, 374 kg P2O5 ha-1, 187 kg K2O ha-1 with 4 replications. The results of the research showed that fertilization application using fertigation through drip irrigation up to 200% as recommended by Ferads did not have a significant effect on the growth and yield of the Bangkok-LP1 variety of water spinach. The productivity of the Bangkok-LP1 variety of water spinach reached 13.64 tons ha-1 in the first planting, while in the second planting with fertilizer residue it produced 12.33 tons ha-1.
Keyword: ferads

Judul: Analisis dan Implementasi Certificate Authorities (CA) pada Public Switched Telephone Network (PSTN)
Abstrak: Secure Telephone Protocol has ability to authenticate involved party and keep the secrecy of the message sent over the protocol. The secrecy of the message archieved by using symmetric key cryptographic scheme, and authentication archieved using public key cryptographic scheme. One of several party involved in the protocol and hold an important function called Certificate Authorities or CA. CA responsible for generating public key pair for other party involved in the protocol. When CA generates public key pair, several primitive cryptographic scheme used for guarantee the security of the key. Two of them are hash function SHA-1 and El-Gamal public key scheme embedded in Digital Signature Algorithm scheme. The prototype implementing the scheme above developed using Java programming language with JCE addition from Bauncy Castle. The analysis towards implemented prototype indicates that the prototype still has some flaws to be implemented in real world.
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