Judul: Respon Tanaman Jagung terhadap Kombinasi Pupuk Organik, Konvensional, Slow Release dan Waktu Pemberian pada Tanah Latosol Dramaga
Abstrak: One of the ways to improve the maize production is by effective and efficient fertilization. Improvement of the fertilizer efficiency is implemented by combination of organic, conventional and slow release fertilizer. The objective of this study was to examine the effect of a combination of organic fertilizer, conventional fertilizer, slow release fertilizer and time of application on the growth, nutrient content and production. The rates of organic fertilizer were without organik fertilizer (O0) and 2,5 ton/ha organic fertilizer (O1). The rates of conventional fertilizer were 50% of recommended rate (S1) and 100% of recommended rate (S2). The rates of slow release fertilizer were 1tablet/plant (P1), 2tablet/plant (P2) and 3 tablets/plant (P3) and the rate of application time were at 10 days after planting (T1) and application at 10 days after planting and 30 days after planting (T2). The results showed that the effect of single treatment, combination of the two and three treatments of organic fertilizer, conventional and slow release were significantly higher on the growth, nutrient content and crop production. The effect of four combinations namely organic fertilizer, conventional, slow release and application time was not significantly different on growth, nutrient content, and production. The highest production of dry grain obtained by combination of organic fertilizer, conventional fertilizer with 100% recommendation rate and slow release fertilizer with 3 tablets/plant with one application time (O1S2P3T1) namely 7.28 ton/ha. The production of dry grain on combination of organic fertilizer, conventional fertilizer with 50% of recommendation rate and slow release fertilizer with 3 tablet/plant with one application time (O1S1P3T1) as similiar to O1S2P3T1 namely 7.20 ton/ha. Based on the production of dry grain, application of slow release fertilizer with 3 tablet/plant reduced 50% of the conventional fertilizer use.
Keyword: production of dry grain, slow release fertilizer, organic fertilizer, conventional fertilizer, corn

Judul: Pengaruh Kombinasi Kotoran Sapi, Pupuk Daun Silika, dan Pestisida terhadap Pertumbuhan dan Produksi Jagung (Zea mays) serta sifat Kimia Latosol, Dramaga
Abstrak: Maize is one of the agricultural crops that has similiar carbohydrate content with rice. The addition of foliar silica fertilizer is potential to prevent soil and water stress, pest attack, and to increase disease resistence as well as the growth and production of maize. This study was aimed to determine the effect of cow-dung manure, NPK fertilizer, foliar silica fertilizer and pesticides combinations on maize (Zea mays) growth and production and also on soil chemical properties of Latosol, Dramaga. The research was designed with randomized block design (RBD) with nine treatments and three replications. Treatment combinations was consisted of T0 (control), T1 (NPK), T2 (NPK + Foliar silica fertilizer), T3 (NPK + Pesticides), T4 (NPK + Foliar silica fertilizer + ½ Pesticides), T5 (Cow-dung manure + ½ NPK), T6 (Cow-dung manure + NPK + ½ Foliar silica fertilizer), T7 (Cow-dung manure + ½ NPK + pesticides), and T8 (Cow-dung manure + ½ NPK + Foliar silica fertilizers + ½ Pesticides). The results showed that generally cow-dung manure + ½ NPK (T5-T8) treatments indicated higher effect in promoting growth, nutrients uptake and corn cob production compared to treatments of NPK (T1-T4). The combination of NPK fertilizer, cowdung manure, foliar silica fertilizer and pesticides did not show significant effect statistically on soil total N, available P, and available Si. The exchangable potassium of soil tended to be higher in NPK combination (T1-T4) than cow-dung manure + ½ NPK combination (T5-T8). However, soil C-organic content in cowdung manure + ½ NPK combination (T5-T8) was higher than that in the NPK combination (T1-T4).
Keyword: Bogor Agricultural University (IPB), foliar silica fertilizer, cow-dung manure, maize

Judul: Posisi Filogenetik Kura-Kura Carettochelys Insculpta  (Reptillia: Testudinata)
Abstrak: Carettochelys insculpta is an endemic freshwater turtle of southern Papua and northern Australia. Phylogenetic position of this turtle is remain unresolved until now. Most of the research conducted show close relationships of C. insculpta and members of Trionychidae family. However, some of the research show distance between C. insculpta and members of Trionychidae family. This research is conducted to analyze phylogenetic relationship between C. insculpta and other members of Testudinata using 12S rRNA, 16S rRNA, and both gene as markers. DNA samples were obtained from three different organisms of C. insculpta. Two species used as outgroups were Alligator mississippiensis and Iguana iguana. Phylogenetic analysis was carried out using Neighbor-Joining method with Felsenstein 1981 (F81) modeltest. A polytomy tree of Testudinata was produced by using 12S rRNA gene. However, analysis using 16S rRNA and both genes as markers confirmed that C. insculpta was located between the Chelonidae and the Trionychidae family.
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