Judul: Relationship of morphological and physiological characters with yield and efforts to increase yield of various types of rice cultivars
Abstrak: The objective of the research was to study relationship between morphological and physiological traits with yield and its components and the cultivation effort to increase grain yield of various types of rice cultivars. Experiment was conducted at Muara Experimental Station, Indonesian Center for Rice Research, Bogor, and at Babakan Experiment Station, University Farm IPB, Bogor, from June 2010 until November 2011. The study consisted of 4 experiments. The first experiment was conducted from June until December 2010 to study morphological characters and agronomy of various types of rice cultivars. The results showed that the top three leaves of new plant type (NPT) were better than those of local varieties (LV), improved new varieties (INV), and hybrid varieties. NPT and hybrids showed erect leaf characteristics and LV had droopy leaf characteristics. The sink capacity in NPT and hybrids was larger than that of INV and LV, but filled grains percentage in the NPT were lower than that of INV and LV. The highest yield was achieved by B11143 line (6.93 tons dry grain ready to mill/ha). The second experiment was conducted from December 2010 until May 2011. The objective of the research was to determine relationship between physiological characteristics with yield and its components in improved rice varieties. The results showed that physiological characteristics of NPT and hybrids were better than LV and INV. The physiological characters of NPT were high in photosynthetic rate, crop growth rate (CGR), and net assimilation rate (NAR) which was maintaned until seed filling stage. The highest yield was achieved by B11143 line (7.32 tons dry grain ready to mill /ha). The higher grain yield was caused by difference in physiological characteristics. The CGR, NAR, chlorophyll, and sugar content were correlated with yield components and yield. The third experiment was conducted from July until November 2011, to study plant spacing to increase yield of various types of rice cultivars. The result showed that yield was enhanced and the best was achieved by plant spacing of 15 cm x 30 cm in Ciherang, Maro, and B11143, while Pandan Wangi was not influenced by plant spacing. The fourth experiment was conducted from May until October 2011, to study nitrogen management to increase yield of various types of rice cultivars. The result showed that increase in nitrogen fertilization increased yield of all varieties. In the N management study, the highest yield was achieved by Ciherang, B11143 and Maro varieties at 125 kg N/ha, while Pandan Wangi at 100 kg N/ha. There was a positive correlation between yield and nitrogen absorbtion and content. Maro varieties at 125 N/ha showed higher absorption and agronomy efficiency (87.9% and 31 kg grain/kg N respectively).
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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: Infeksi Cacing Jantung Dirofilaria Immitis, Railliet & Henry, 1911 Pada Anjing
Abstrak: Cacing Dirofilaria immitis dewasa yang tinggal dalm ventrikel kanan jantung anjing, sering kali menimbulkan gejala klinis yang cukup berat. Cacing Tersebut menghasilkan mikrofilaria yang selanjutnya berkembang menjadi larva infektif dalam saluran malphigi induk semang entara, yaitu nyamuk dari genus Culex, Aedes dan Anopheles.
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