Judul: PRELIMINARY YIELD TRIAL of 35 RICE LINES (Oryza sativa L.) of F5 and F6 GENERATIONS as SHORT GENOTYPE for MULTICANOPY LINES
Abstrak: Sistem budidaya multikanopi merupakan teknik menanam padi yang mengombinasikan genotipe pendek dengan genotipe tinggi untuk ditanam secara berdekatan dalam satu lubang tanam. Penelitian ini bertujuan mengevaluasi daya hasil dan keragaan galur padi sebagai genotipe pendek pada sistem multikanopi. Tiga puluh lima galur padi generasi F5 dan F6 dan dua varietas pembanding digunakan sebagai genotipe pendek, dengan galur IPB187-F-40-1-1 sebagai genotipe tinggi. Penelitian ini dilaksanakan sejak Februari hingga Juli 2023 di Kebun Percobaan Sawah Baru, Bogor. Rancangan kelompok lengkap teracak (RKLT) dengan tiga ulangan digunakan dalam percobaan ini. Faktor genotipe berpengaruh sangat nyata terhadap seluruh karakter genotipe pendek. Terdapat delapan galur dengan produktivitas lebih tinggi daripada kedua pembanding di lingkungan multikanopi. Pola tanam multikanopi mampu meningkatkan rata-rata produktivitas total varietas pembanding sebesar 22,28% dibandingkan monokultur. Karakter tinggi tanaman vegetatif (TTV), jumlah anakan produktif (JAP), jumlah gabah bernas per malai (JGBM), dan bobot seribu butir (BSB) digunakan sebagai kriteria seleksi karena memiliki nilai pengaruh langsung yang besar terhadap produktivitas genotipe pendek. Karakter JAP dan JGBM diberi bobot lebih besar karena memiliki keragaman genetik yang lebih luas. Seleksi berdasarkan indeks seleksi terboboti dengan intensitas sebesar 20% menghasilkan delapan galur terbaik sebagai galur potensial. Galur potensial tersebut mencakup galur IPB201-F-15, IPB201-F-13, IPB204-E-11, IPB200-F-42, IPB200-F-30, IPB201-F-10, IPB200-F- 40, dan galur IPB200-F-32., The multi-canopy cropping system is a rice cultivation technique that combines short genotype with tall genotype to be planted closely on the same hill. This study aimed to evaluate the yield and agronomic performance of rice lines as a short genotype for the multi-canopy system. Thirty-five rice lines of F5 and F6 generation and two check varieties were used as short genotype, with IPB187-F-40- 1-1 as tall genotype. The experiment was conducted from February to July 2023 at the Sawah Baru experimental station at Babakan, Bogor; and was arranged in a randomized completed block design (RCBD) with three replications. The genotype's effect was highly significant for all traits related to the short genotype. In the multi-canopy system, eight lines exhibited higher productivity than both checks. The check varieties in the multi-canopy system achieved an average total yield of 22.28% higher than that of the monoculture. The vegetative plant height (VPH), number of productive tillers (NPT), number of filled grains per panicle (NFG), and thousand-grain weight (TGW) traits were employed as target selection because of their significant direct effects on the productivity of short genotypes. NPT and NFG were assigned higher weights because of their broader genetic diversity. Selection based on a weighted standardised selection index with an intensity of 20% yielded eight best-performing lines as promising lines. These promising lines included IPB201-F-15, IPB201-F-13, IPB204-E-11, IPB200-F-42, IPB200-F-30, IPB201-F-10, IPB200-F-40, and IPB200-F-32.
Keyword: cropping system, genetic parameter, path analysis, selection indices, yield advantage

Judul: Performance Testing of 26 Combinations of Rice  Lines (Oryza sativa L.) of F7 Generation in Multi-canopy System
Abstrak: Peningkatan produktivitas padi melalui intensifikasi berupa penggunaan varietas unggul dan pola tanam optimum dilakukan untuk memenuhi kebutuhan konsumsi utama masyarakat. Multikanopi merupakan sistem penanaman dua genotipe padi yang memiliki perbedaan katakter tinggi tanaman pada hamparan lahan baku yang sama dengan jarak tanam yang berdekatan. Penelitian ini bertujuan menguji keragaan galur padi sebagai calon genotipe padi tinggi dan padi pendek pada pola tanam multikanopi. Penelitian ini dilaksanakan pada bulan Maret sampai bulan Juli 2024 di Kebun Percobaan Sawah Baru IPB, Desa Babakan, Kecamatan Dramaga, Bogor. Penelitian ini menggunakan rancangan kelompok lengkap teracak faktor tunggal dengan 3 ulangan. Bahan tanam yang digunakan yaitu 24 genotipe padi tinggi dan 3 genotipe padi pendek dengan 2 varietas pembanding. Hasil penelitian menunjukkan bahwa terdapat satu kombinasi multikanopi yaitu galur IPB200-F-48 & Inpari 32 (5,66 ton ha?¹) yang berbeda nyata lebih tinggi dari kedua varietas pembanding yaitu Inpari 32 (3,42 ton ha?¹) dan Ciherang (3,36 ton ha?¹). Kombinasi galur IPB187-F-40 & Inpari 32 (5,50 ton ha?¹) memiliki hasil yang berbeda nyata lebih tinggi dari varietas Ciherang. Terdapat 3 kombinasi lainnya yang memiliki produktivitas multikanopi di atas 5 ton ha?¹ yaitu galur IPB200-F-46 & Inpari 32 (5,04 ton ha?¹), IPB202-F-4 & IPB200-F-60 (5,14 ton ha?¹), dan IPB200-F-58 & IPB200-F-43 (5,18 ton ha?¹)., Increasing rice productivity through intensifications by using improved varieties and optimum cropping systems are carried out to meet the main consumption needs of the community. Multi-canopy is a system of planting two rice genotypes with different plant heights with close spacing in one area. This research aimed to evaluate several rice lines as candidates of tall and short rice genotypes for the multi-canopy planting system. The research was carried out from March to July 2024 at the IPB Sawah Baru Experimental Station, Babakan Village, Dramaga District, Bogor. This study used a single-factor randomized completed block design with three replications. The planting materials used were 24 tall rice genotypes and 3 short rice genotypes with 2 check varieties. The results of the research showed that one multi-canopy combination, IPB200-F-48 & Inpari 32 (5.66 tons ha?¹), had a significantly higher yield than the two check varieties, Inpari 32 (3.42 tons ha?¹), and Ciherang (3.36 tons ha?¹). Meanwhile, another multi-canopy combination IPB187-F-40 & Inpari 32 (5.50 tons ha?¹), had a significantly higher yield than the Ciherang variety. There are three other multi-canopy combinations yielded higher that 5 ton ha?¹, namely IPB200-F-46 & Inpari 32 (5.04 tons ha?¹), IPB202-F-4 & IPB200-F-60 (5.14 tons ha?¹), and IPB200-F-58 & IPB200-F-43 (5.18 tons ha?¹).
Keyword: Produktivitas Padi, genotipe, multikanopi, genotipe tinggi, genotipe pendek

Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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