Judul: Morpho-physiology Characters of Rice (Oryza sativa) Genotypes in Direct Seediing of Rice System
Abstrak: Sistem budidaya tanam benih langsung (Tabela) telah banyak dipraktikkan di berbagai negara Asia karena dianggap lebih hemat air dan tenaga kerja serta memberikan keuntungan yang lebih baik dibandingkan sistem pindah tanam. Namun demikian, perbaikan pengelolaan praktik sistem budidaya ini masih diperlukan khususnya dalam pola tanam dan penggunaan varietas yang sesuai. Penelitian ini bertujuan untuk mengkaji karakter fisiologi, komponen hasil dan hasil genotipe padi pada sistem budidaya pindah tanam dan Tabela. Penelitian ini dilaksanakan di lahan dengan sistem budidaya pindah tanam dan Tabela (sebar alur dan sebar permukaan) serta menggunakan 4 galur unggulan dan satu varietas nasional. Sebanyak 25 kombinasi perlakuan dirancang dengan rancangan split-plot kelompok acak lengkap (Split plot RAKL) dengan 3 ulangan setiap perlakuan. Hasil penelitian menunjukkan bahwa padi yang ditanam dengan Tabela laju fotosintesis yang sama dengan tanaman padi pada budidaya pindah tanam, namun menghasilkan panjang malai, jumlah gabah per malai, dan jumlah gabah isi yang lebih rendah serta waktu berbunga lebih cepat. Genotipe IPB193-F-17-2-3 menghasilkan produktivitas tertinggi pada budidaya tanam benih langsung lahan basah (metode alur dan sebar) dan lahan kering (metode alur). Genotipe IPB193-F- 38-2-1 menghasilkan produktivitas tertinggi pada sistem pindah tanam dan tanam benih langsung lahan kering (metode sebar). Produktivitas varietas Ciherang pada sistem tanam benih langsung (metode alur) tidak berbeda dengan sistem pindah tanam. Temuan ini mengindikasikan bahwa sistem tanam benih langsung dengan metode alur cukup menjanjikan untuk dikembangkan lebih lanjut., The direct seeding of rice (DSR) system has been widely practiced in various Asian countries because it is considered more efficient in water and labor and provides better benefits than transplanting systems. However, improvements in the management of this system practice are still needed, especially in cropping patterns and the use of appropriate varieties. This study examines the physiological characteristics, yield components, and yields of rice genotypes in transplanting and DSR systems. This research was carried out in the field with transplanting and DSR cultivation systems (drill and broadcast sowing) and used four superior lines and one national variety. A total of 25 treatment combinations were designed using a split-plot randomized complete block design (Split plot-RCBD) with three replications for each treatment. The results showed that rice grown with DSR had no different level of greenery and photosynthesis rate than rice in transplanting cultivation, but produced lower panicle length, the number of grains per panicle, the number of filled grains, and faster flowering time. Genotype IPB193-F-17-2-3 produced the highest productivity in wet DSR (drill and broadcast sowing) and dry DSR (drill sowing). Genotype IPB193-F-38-2-1 had the highest productivity in transplanting techniques and dry DSR (broadcast method). The productivity of the Ciherang variety in the DSR system (drill method) was not different from the transplanting system. This finding indicates that the direct seeding system using the drill method is promising for further development.
Keyword: cultivation system, early vigor, embryo, endosperm, seed traits

Judul: Yield Trial of 38 New Plant Type Rice in Low Dose Fertilization
Abstrak: Padi merupakan tanaman pangan yang digunakan sebagai pemenuhan kebutuhan karbohidrat utama masyarakat Indonesia. Peningkatan produktivitas padi diperlukan melalui pemuliaan tanaman padi tipe baru untuk memenuhi kebutuhan padi nasional. Penelitian ini bertujuan menguji galur-galur padi sawah tipe baru pada kondisi pemupukan dosis rendah. Penelitian dilaksanakan di Kebun Percobaan IPB Sawah Baru Desa Babakan, Kecamatan Dramaga, Kabupaten Bogor, Jawa Barat sejak Bulan April sampai Juli 2021. Penelitian menggunakan rancangan kelompok lengkap teracak (RKLT) faktor tunggal yaitu terdiri atas 38 galur dan satu varietas pembanding dengan dua ulangan. Hasil analisis ragam pada galur-galur uji memiliki daya hasil yang tidak berbeda nyata dengan varietas pembanding. Namun, terdapat 3 nomor galur yang memiliki daya hasil lebih tinggi serta memiliki karakter agronomi yang lebih baik daripada varietas Ciherang. Galur-galur tersebut adalah IPB187-F-37-1-2 (6,26 ton ha-1), IPB193-F30-2 (6,22 ton ha-1) dan IPB189-F-132-1-1 (6,20 ton ha-1), sedangkan varietas Ciherang sebagai pembanding memiliki daya hasil sebesar 5,87 ton ha-1., Rice is a food crop that is used to fulfill the main carbohydrate needs of the Indonesian people. Increasing rice productivity is needed through breeding of new types of rice plants to meet the national rice needs. This study aimed to evaluate promising lines of rice under low-dose fertilization conditions. The experiment was conducted at the Sawah Baru Experimental Station IPB, Babakan Village, Dramaga, Bogor, West Java, started from April to July 2021. The study used of randomized complete block design (RCBD) single factor consisting of 38 lines and one check variety with two replications. The results showed that yield of the lines evaluated were no significantly different from the check varieties. However, there were 3 lines that had the higher yield and had better agronomic characters than the Ciherang variety. These lines are IPB187-F-37-1-2 (6.26 ton ha-1), IPB193-F-30-2 (6.22 ton ha-1) and IPB189-F-132-1-1 (6.20 ton ha-1), while the Ciherang variety check has a yield of 5.87 tons ha-1.
Keyword: agronomic character, new plant type, yield power

Judul: Konstruksi Hukum Grup Kurva Eliptik Atas F3m
Abstrak: Elliptic curves upon F3m can be divided in two cases, i.e. supersingular and nonsupersingular case. Based on group laws on elliptic curves, a new arithmetic upon F3m can be formulated as an addition process of two random points on the curve. This addition process can then be applied to the ElGamal algorithm.
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