Judul: Pengaruh pemberian soil conditioner terhadap sifat fisik tanah latosol Darmaga
Abstrak: Tanah Latosol mempunyai potensi yang tinggi bagi pengembangan lahan pertanian dan merupakan tanah dominan kedua setelah Podsolik. Akan tetapi tanah Berte tersebut memiliki kemasaman tanah tinggi, miskin kandungan hara makro terutama P, K, Ca, dan Mg, dan kandungan bahan organik rendah. Untuk mengatasi permasalahan tersebut perlu dilakukan penambahan bahan organik sebagai soil conditioner. Bahan pembenah tanah (soil conditioner) didefinisikan sebagai bahan-bahan sintetis atau alami, organik atau mineral, berbentuk padat maupun cair yang mampu memperbaiki sifat fisik, kimia, dan biologi tanah. Penelitian bertujuan mempelajari pengaruh penambahan soil conditioner terhadap perbaikan sifat fisika tanah Latosol Darmaga. Perlakuan yang diterapkan adalah dosis soil conditioner yaitu A (perbandingan soil conditioner: tanah, 1:20), B (soil conditioner: tanah, 1: 30), dan C (soil conditioner tanah, 1:40), O (tanpa perlakuan). Soil conditioner yang @digunakan dalam bentuk briket dicampur merata dengan tanah dengan jumlah total soil conditioner dan tanah sebesar 4 kg (BKM). Soil conditioner dengan tanah diinkubasi dalam kondisi sekitar kapasitas lapang selama 2 bulan. Bogor) Soil conditioner memberi pengaruh cukup baik dalam meningkatkan pori drainase cepat. Sedangkan bobot isi, porositas tanah, kadar air tanah, pori drainase sangat cepat, dan pori drainase lambat serta pori air tersedia tidak dipengaruhi oleh aplikasi soil conditioner. Walaupun demikian terdapat kecenderungan menurunkan bobot isi tanah (antara kontrol dengan dosis optimum yaitu dosis A mengalami penurunan bobot isi sebesar 6%), pori drainase sangat cepat (19%), meningkatkan kadar air jenuh (9%), porositas tanah (1,5%), pori drainase lambat (66%), dan meningkatkan pori air tersedia Latosol Darmaga (73%). Hal ini disebabkan inkubasi soil conditioner baru dilakukan dalam waktu 2 bulan, sedangkan untuk memperbaiki Usifat fisik tanah diperlukan waktu yang lebih lama…dst
Keyword: Soil bulk density, Soil conditioner, Soil porosity, Quick drainase pore

Judul: Pengaruh Pupuk Kandang, Zeolit, dan Skim Lateks Terhadap Berbagai Sifat Fisik Tanah Latosol Darmaga
Abstrak: Latosol Darmaga formed in areas with precipitation more than 3000 mm/year and high temperatures which can result in soil erosion by the raindrop impacts that can damage the soil physical properties. Therefore, the action needs to be done that can improve the physical properties of soil. Improving the physical properties of soil can be done with the addition of manure, zeolites, and skim latex. The purpose of this research is to study the influence of the addition manure, the mineral zeolite, skim latex, and there combinations to changes some soil physical properties of Latosol Darmaga and corn production. Research conducted at the Cikabayan garden and Soil and Water Conservation Laboratory since February 2007 until August 2007. The treatment given is A (control), B (manure), C (zeolite), D (manure + zeolite), E (manure + skim latex), F (zeolite + skim latex), and G (manure+zeolit + skim latex). The dose given was 4.5 kg / plot. The results showed that bulk density after the manure, zeolites, skim latex and there combination showed an increase, aggregate stability of treatments G (manure + zeolite + skim latex) significantly more stable compared with treatment A (control), B (manure) , C (zeolite), D (manure + zeolite), E (manure + skim latex), and F (zeolite + skim latex) in the amount of 58.83. Fast drainage pores in treatment B (manure) more high significantly than A (control) and treatment D (manure + zeolite). The addition of manure, zeolites, skim latex and there combination tends to increase the number of slow drainage pores, available water pores and the mean weight diameter (MWD) of 4.76 mm, while the mean weight diameter (MWD) 2.83 mm was decreased. From this research, suggested that addition soil conditioner to the good soil physical properties need to be done in order to conserve the land to avoid degradation.
Keyword: 

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.
Keyword: