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: Respon of Corn Varieties ( Zea mays L.) to Water Saturated Cultivation with the Application of Macro Micro Nutriens in Tidal Swamp Lnad
Abstrak: Budidaya jagung di lahan pasang surut memiliki banyak kendala yakni rendahnya unsur hara dan pH tanah yang sangat asam. Salah satu teknik budidaya untuk menangani kendala tersebut adalah dengan budidaya jenuh air. Selain itu, pemberian unsur hara makro mikro yang optimum dan penggunaan varietas yang toleran dapat meningkatkan produktivitas jagung. Penelitian ini bertujuan mengetahui respon pertumbuhan tanaman jagung (Zea mays L.) di berbagai varietas pada budidaya jenuh air dengan pemberian unsur hara makro dan mikro di lahan pasang surut. Penelitian dilaksanakan pada bulan Maret˗Agustus 2023 di Desa Karya Bakti, Kecamatan Rantau Rasau, Kabupaten Tanjung Jabung Timur, Jambi. Penelitian menggunakan rancangan faktorial RKLT. Faktor pertama adalah pemberian unsur hara makro dan mikro dengan 8 perlakuan yang terdiri dari: tanpa perlakuan atau kontrol (P1), pemberian N (P2), pemberian N dan P (P3), pemberian N, P, dan K (P4), pemberian NPK dan dolomit (P5), pemberian NPK, dolomit dan pupuk kandang (P6), pemberian NPK, dolomit, pupuk kandang dan Cu (P7), pemberian NPK, dolomit, pupuk kandang, Cu dan Zn (P8). Faktor kedua adalah varietas, yang terdiri atas: NK Sumo (V1) dan Pioneer 27 (V2). Terdapat 3 ulangan dengan 48 satuan percobaan. Data dibandingkan menggunakan uji F dan jika perlakuan berbeda nyata maka dilakukan uji lanjut DMRT pada taraf 5%. Hasil menunjukkan bahwa pemberian unsur hara makro lengkap menunjukkan hasil yang berbeda nyata pada setiap karakter pengamatan. Produktivitas varietas NK Sumo tidak berbeda nyata dengan Pioneer 27. Pemberian unsur mikro tidak berpengaruh nyata terhadap hampir semua karakter pengamatan., Cultivating corn in tidal land faces numerous challenges, such as low nutrient content and highly acidic soil pH. One cultivation technique to address these issues is through water-saturated soil cultivation. In addition, optimizing the application of macro and micronutrients, as well as using tolerant varieties can enhance corn productivity. This research aims to determine the growth response of corn plants (Zea mays L) in water-saturated soil cultivation using various varieties and applying macro and micronutrients in tidal land. The study was conducted from March to August 2023 in Karya Bakti Village, Rantau Rasau District, East Tanjung Jabung Regency, Jambi. The research employed a randomized factorial design (RKLT). The first factor involved the application of macro and micronutrients with 8 treatments: Control (P1), nitrogen application (P2), nitrogen and phosphorus application (P3), nitrogen, phosphorus, and potassium application (P4), NPK and dolomite application (P5), NPK, dolomite, and organic fertilizer application (P6), NPK, dolomite, organic fertilizer, and copper (Cu) application (P7), NPK, dolomite, organic fertilizer, copper (Cu), and zinc (Zn) application (P8). The second factor was the varieties: NK Sumo (V1) and Pioneer 27 (V2). There were 3 replications with 48 experimental units. Data were compared using an F-test, and if significant differences were found, a Tukey's Honestly Significant Difference (HSD) test was conducted at the 5% level. The results indicate that applying complete macronutrients significantly influenced each observed characteristic. The productivity of the NK Sumo variety did not significantly differ from Pioneer 27 variety. The application of micronutrients did not significantly affect nearly all observed characteristics.
Keyword: jagung, unsur hara, NK Sumo, Pioneer 27, produktivitas

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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