Judul: Response of Varieties and Frequency of N, P, and K Fertilization on Corn (Zea mays) with Saturated Water Cultivation in Tidal Land
Abstrak: Permasalahan produksi jagung yang masih berfluktuasi dapat diatasi baik secara intensifikasi maupun ekstensifikasi. Inovasi pertanian sangat diperlukan untuk mengatasi permasalahan tersebut, seperti pemanfaatan lahan marginal khususnya pada lahan pasang surut sebagai agroekosistem. Penelitian ini bertujuan mengetahui pengaruh varietas dan frekuensi pemupukan N, P dan K pada tanaman jagung (Zea mays) di lahan pasang surut. Rancangan percobaan yang digunakan yaitu rancangan kelompok lengkap teracak (RKLT) faktorial dengan 2 perlakuan. Perlakuan pertama yang diteliti yaitu frekuensi pemupukan N, P, dan K meliputi: 1 kali frekuensi pemupukan pada 0 MST, 2 kali frekuensi pemupukan pada 0 dan 4 MST, dan 3 kali frekuensi pemupukan pada 0, 4, dan 8 MST. Perlakuan kedua meliputi empat varietas jagung yaitu: Pioneer-27, NK Sumo, Advanta Ruby, dan Bisi-18. Frekuensi pemupukan N, P, dan K 2 kali memberikan pengaruh terbaik terhadap karakter vegetatif. Frekuensi pemupukan 3 kali memberikan pengaruh terbaik terhadap komponen hasil dengan produktivitas 5,63 ton ha-1 . Interaksi antar perlakuan berpengaruh nyata, kombinasi terbaik diperoleh pada perlakuan varietas NK Sumo dan frekuensi pemupukan 3 kali dengan produktivitas 6,41 ton ha-1 ., The problem of corn production which is still fluctuating can be overcome both by intensification and extensification. Agricultural innovation is needed to overcome these problems, such as the use of marginal land, especially on tidal land as an agro-ecosystem. This study aims to determine the effect of variety and frequency of N, P, and K fertilization on maize (Zea mays) in tidal fields. The experimental design used was a factorial randomized complete group design (RKLT) with 2 treatments. The first treatment studied was the frequency of N, P and K fertilization including: 1 times the fertilization frequency at 0 MST, 2 times the fertilization frequency at 0 and 4 MST, and 3 times the fertilization frequency at 0, 4, and 8 MST. The second treatment included four varieties of corn namely: Pioneer-27, NK Sumo, Advanta Ruby, and Bisi 18. The frequency of N, P, and K fertilization twice gave the best effect on vegetative characters. The 3 times fertilization frequency gave the best effect on yield components with a productivity of 5.63 tons ha-1 . The interaction between treatments had a significant effect, the best combination was obtained on the NK Sumo variety treatment and the fertilization frequency was 3 times with a productivity of 6.41 tons ha-1 .
Keyword: corn, fertilization frequency, BJA, tides

Judul: The Effect of N Doses Fertilizer and Varieties on Corn Growth and Production in Saturated Soil Culture in Rice Fields
Abstrak: Jagung (Zea mays L.) merupakan komoditas pangan kedua setelah beras yang berperan sebagai sumber karbohidrat. Peningkatan konsumsi jagung perlu diseimbangi dengan peningkatan produktivitas. Penelitian bertujuan mengetahui pengaruh dosis pupuk N dan varietas terhadap pertumbuhan dan produksi jagung pada budidaya jenuh air di lahan sawah. Penelitian menggunakan rancangan percobaan RKLT dengan dua faktor yaitu varietas dan dosis pupuk N. Faktor varietas terdiri atas dua taraf yaitu jagung Sukmaraga dan Pioneer 27. Faktor dosis pupuk N terdiri atas 0 kg N ha-1, 90 kg N ha-1, 135 kg N ha-1, dan 180 kg N ha-1. Hasil penelitian menunjukkan bahwa faktor varietas menunjukkan hasil yang berbeda di awal pertumbuhan yaitu pada karakter tinggi tanaman, diameter batang, dan jumlah daun, serta bobot basah akar. Selain itu terdapat perbedaan pada komponen hasil yaitu pada karakter diameter tongkol, jumlah baris biji per tongkol, dan bobot 100 biji. Dosis N 180 kg N ha-1 memberikan hasil terbaik untuk semua karakter pertumbuhan dan produksi namun tidak berbeda nyata dengan dosis N 135 kg N ha-1. Tidak terjadi interaksi antara faktor varietas dan dosis N., Corn (Zea mays L.) is the second food commodity after rice which acts as a carbohydrate source. Increased consumption of corn needs to be balanced with productivity. This study aims to determine the effect of N fertilizer dosage and varieties on the growth and production of maize in saturated soil culture in paddy fields. This study used an Randomized Complete Block design (RCBD) with two factors, namely the variety and dose of N fertilizer. Variety factors consisted of two levels, namely Sukmaraga and Pioneer 27. The dosage factor for N fertilizer consisted of 0 kg N ha-1 , 90 kg N ha-1, 135 kg N ha-1, and 180 kg N ha-1. The results of this study indicated that the variety factor showed different results at the character of plant height, stem diameter, number of leaves, and root wet weight,the ear diameter, number of seed rows per ear, and the weight of 100 seeds. The N dose of 180 kg N ha-1 gave the best results for all growth and production characters but was not significantly different from the N dose of 135 kg N ha-1. There was no interaction between the variety factor and the N dose.
Keyword: Nitrogen dose, Pioneer 27, Saturated soil culture, Sukmaraga

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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