Judul: The Effect of Inorganic Boric Fertilizer on the Growth and Production of Sweet Corn in Dramaga Latosol
Abstrak: Pemupukan unsur mikro diperlukan terutama pada tanah-tanah pertanian yang intensif, salah satunya boron. Boron (B) merupakan unsur hara mikro esensial yang berperan penting dalam peningkatan produksi tanaman. Penelitian ini bertujuan menguji efektivitas pupuk an-organik borat terhadap pertumbuhan dan produksi jagung manis (Zea mays saccharata Sturt). Percobaan ini menggunakan Rancangan Acak Kelompok satu faktor, yaitu delapan perlakuan kombinasi pupuk borat (B) dan pupuk NPK Standar (NPK) meliputi: (1) Kontrol (tanpa B dan tanpa NPK); (2) Standar (tanpa B + 1 NPK); (3) ½ B + 3/4 NPK; (4) 1 B + 3/4 NPK; dan (5) 1½ B + 3/4 NPK; (6) ½ B + 1 NPK; (7) 1 B + 1 NPK; (5) 1½ B + 1 NPK. Setiap perlakuan diulang 4 kali sehingga diperoleh 32 satuan percobaan. Satu dosis pupuk borat (1 B) setara dengan 12 kg/ha pupuk an-organik borat (46% B2O3). Satu dosis NPK standar adalah 300 Urea/ha, 200 SP36/ha, dan 150 KCl/ha. Hasil penelitian menunjukkan bahwa pupuk borat nyata meningkatkan, bobot segar brangkasan, dan produksi tongkol jagung manis, serta mengefisienkan pemupukan NPK. Pemupukan borat nyata meningkatkan produksi tongkol dibanding Kontrol, namun tidak berbeda nyata dibanding Standar. Rekomendasi pemupukan jagung manis menggunakan pupuk an-organik borat adalah 12 sampai 18 kg/ha.
Keyword: Boron, fertilization efficiency, RAE, trace elements, Zea mays

Judul: The Effect of Combination B and NPK Fertilizer on the Growth of Swet Corn and Some Nutrients in Darmaga Inceptisols
Abstrak: Tanah-tanah di daerah tropik memiliki kadar B total dan tersedia yang rendah. Intensifikasi produksi dalam jangka panjang berpotensi menyebabkan defisiensi B dan penurunan produktifitas jagung manis. Penelitian ini bertujuan untuk mengetahui kadar B tersedia tanah dan kadar B daun, N-total, P-total dan tersedia serta K-dd dalam tanah. Rancangan percobaan menggunakan Rancangan Fraksional Acak Kelompok non faktorial dengan delapan perlakuan yang terdiri dari kontrol (B0S0), standar (B0S1), B1S1, B2S1, B3S1, B1S2, B2S2, dan B3S2 dengan empat ulangan sehingga terdapat 32 satuan percobaan. Pupuk kandang dan kapur sebagai pupuk dasar diberikan ke seluruh petak satu minggu sebelum tanam. Hasil penelitian menunjukkan bahwa kombinasi pupuk B dan NPK tidak signifikan dalam meningkatkan kandungan P-total dan tersedia, K-dd dalam tanah, kadar B daun, dan pertumbuhan jagung manis. Namun signifikan meningkatkan kadar B tersedia tanah, N-total, dan mempercepat menculnya bunga jantan (tasseling). Perlakuan B1S1 dengan dosis pupuk B = 9 kg/ha dan NPK = 300 kg/ha optimal dalam menunjang pertumbuhan dan mempercepat fase pembungaan jagung manis., Soils in tropical climates have low total and available B content. Intencification of production on the long term, potentially cause B deficiency and decreasing the productivity of sweet corn. This study aims to determine the content of available B in soil and B in leafes, total-N, total and available P, and exchangeable Potassium in the soil. The experimental design used non-factorial Randomized Fractional Design with eight treatments consisting of control (B0S0), standard (B0S1), B1S1, B1S1, B2S1, B3S1, B1S2, B2S2, and B3S2 with four replications so there were 32 experimental units. Manure and lime as basic fertilizers were applied to all plots one week before planting. The results showed that the combination of B and NPK fertilizers were not significant in increasing the total and available P content, exchangeable Potassium in the soil, content of B in leafes, and the growth of sweet corn. However, it’s significant in increasing the available B content in the soil, total-N, and accelerate the appearance of male flowers (tassel). B1S1 treatment with a dose of fertilizer B = 9 kg/ha and NPK= 300g/ha is optimal in supporting growth and accelerating the flowering phase of sweet corn.
Keyword: Availability, boron, deficiency, soil parameters, sweet corn

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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