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: Response of Growth and  Production of Corn  to The Combination of Various Types of Biological Fertilizer and NPK
Abstrak: Jagung (Zea mays L.) merupakan tanaman serealia penting ketiga di dunia. Namun, dalam proses budidayanya masih mengandalkan pupuk kimia sebagai sumber hara bagi tanaman. Penggunaan pupuk kimia yang terus menerus ini dapat berpotensi menurunkan produktivitas tanah. Pengaplikasian pupuk hayati dapat menjadi salah satu solusi untuk meningkatkan kesuburan tanah. Penelitian ini bertujuan mempelajari efektivitas kombinasi pemberian berbagai jenis pupuk hayati dan NPK terhadap pertumbuhan dan produksi tanaman jagung. Penelitian dilaksanakan di KP Sawah Baru pada Desember 2023-Februari 2024. Rancangan percobaan yang digunakan adalah rancangan split-plot dengan faktor NPK sebagai petak utama yang terdiri dari dua taraf dan pupuk hayati sebagai anak petak yang terdiri dari 5 taraf. Hasil penelitian menunjukkan pemberian jenis pupuk hayati berpengaruh nyata terhadap pertumbuhan dan komponen hasil jagung yang ditandai dengan peningkatan tinggi, diameter batang, kehijauan daun, bobot brangkasan, panjang tongkol, diameter tongkol, dan kemanisan jagung., Corn (Zea mays L.) is the third important cereal crop in the world. However, in the cultivation process it still relies on chemical fertilizers as a source of nutrients for plants. The continuous use of chemical fertilizers can potentially reduce soil productivity. The application of biofertilizers can be one of solution to increase soil fertility. This research aims to study the effectiveness of the combination of applying various types of biofertilizers and NPK on the growth and production of corn plants. The research was conducted in Sawah Baru in Experimental Station December 2023-February 2024. The experimental design used was a split-plot design with NPK factors as the main plot consisting of two levels and biofertilizer factors as subplots consisting of 5 levels. The results showed that the application of this type of biofertilizer had a significant effect on the growth and yield components of corn, which were characterized by an increase in height, stem diameter, leaf greenness, strand weight, cob length, cob diameter, and corn sweetness.
Keyword: corn, effectiveness, biofertilizer, NPK, combination

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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