Judul: Pengaruh Pemberian Mulsa Jerami Jagung dan Kepadatan Tanah terhadap Pertumbuhan dan Produksi Jagung (Zea Mays)
Abstrak: Penelitian bertujuan untuk mengetahui pengaruh pemberian mulsa jerami jagung dan kepadatan tanah terhadap karakteristik fisik tanah serta menentukan bobot isi dan dosis mulsa yang paling sesuai untuk pertumbuhan dan produksi jagung. Percobaan dirancang menggunakan rancangan acak lengkap faktorial. Faktor pertama adalah perlakuan tingkat kepadatan tanah yang terdiri dari bobot isi 0.8, 1.0, dan 1.2 g/cm3 (K1, K2, dan K3). Faktor kedua adalah perlakuan pemberian mulsa jerami jagung yaitu 0%, 30%, 60%, dan 90% (M0, M1, M2, dan M3). Data dianalisis menggunakan analisis ragam (ANOVA) dan uji lanjut Beda Nyata Jujur (BNJ) pada taraf 5% serta dibentuk persamaan regresi. Hasil penelitian menunjukkan interaksi kepadatan tanah dengan mulsa berpengaruh nyata terhadap tinggi tanaman pada umur 11-14 MST, jumlah daun pada umur 10, 11, 12, dan 14 MST, bobot kering tongkol dengan kelobot dan tanpa kelobot, serta bobot pipilan kering. Peningkatan kepadatan tanah berpengaruh nyata terhadap kadar air kapasitas lapang, resistensi tanah sebelum penanaman, evapotranspirasi fase reproduktif dan total satu musim tanam, bobot akar, biomassa tanaman, pertumbuhan dan produksi, serta karakteristik fisik tanah setelah panen. Pemberian mulsa berpengaruh nyata terhadap evapotranspirasi fase vegetatif, tinggi tanaman pada umur 8-14 MST, diameter batang pada umur 10 MST, dan produksi, kecuali bobot pipilan kering. Bobot isi dan tutupan mulsa yang sesuai untuk pertumbuhan dan produksi jagung adalah 0.8 g/cm3 dan 90%.
Keyword: corn growth and production, field capacity, mulch, soil compaction

Judul: Pengaruh Pemberian Mulsa Jerami Jagung dan Kepadatan Tanah terhadap Pertumbuhan dan Produksi Jagung (Zea mays)
Abstrak: Intensive land cultivation can damage soil structure and further enable soil to be compact, and reduce water availability in the soil. Mulch application to cover the soil surface will reduce evaporation rate and increase availability of water in the soil. The research was aimed to study the effect of corn straw mulching and soil density application on physical characteristics of the soil, to determining soil bulk density and dose of mulch which is most suitable for corn growth and production of corn. The experiment was designed using a completely randomized factorial design. The first factor is the density of soil which is consist of soil bulk density 0.8, 1.0, dan 1.2 g/cm3 (K1, K2, dan K3). The second factor was corn straw mulch application which was divided into three doses i.e. 0%, 30%, 60%, and 90% (M0, M1, M2, and M3). Data were analyzed using analysis of variance (ANOVA) and further testing using Tukey Test at the level of 5%. The results of the research show the interaction of soil compaction with mulch were significantly affect on plant height at age 11-14 weeks after growing, the number of leaves at the age of 10, 11, 12, and 14 weeks after growing, dry weight of corncob both with and without husk, and dry weight of seed.The increasing of soil compaction were significantly affect on field capacity, soil resistance before planting, both total and reproductive phase evapotranspiration in single growing season, weight of roots, plant biomass, plant growth and production, also soil physics characteristic after harvest. Mulch application significantly affect on evapotranspiration of vegetative phase, plant height at 8-14 weeks after growing, stem diameter at 10 weeks after growing, and production except dry weight of seed. Soil bulk density and mulch cover suitable for the growth and production of corn is 0.8 g/cm3 and 90%.
Keyword: soil compaction, mulch, field capacity, corn growth and production

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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