Judul: Efektifitas asam humik dan mikroba daun dalam meningkatkan pertumbuhan dan produksi padi sawah
Abstrak: Tujuan dari penelitian ini adalah untuk menguji efektifitas dari asam humik dan mikrob daun dalam meningkatkan pertumbuhan dan produksi padi sawah. Penelitian dilakukan mulai bulan September 2006 sampai Januari 2007 di Lahan penelitian dan Laboratorium Microbiologi dan Bioteknologi, Indonesian Center for Biodiversity and Biotechnology (ICBB), Bogor dan Laboratorium Bioteknologi Tanah Fakultas Pertanian, IPB. Penelitian ini dilakukan dengan Rancangan Acak Lengkap (RAL) dengan 4 perlakuan dan 3 ulangan. Adapun perlakuannya yaitu perlakuan BoHoSi (pemupukan standar), BoHiSi (pemupukan standar + asam humik), BiHoSi (pemupukan standar + mikrob daun) dan BiHiSi (pemupukan standar + asam humik + mikrob daun). Penyemprotan asam humik dan mikrob daun dilakukan sebanyak 7 kali dengan dosis penyemprotan 5 liter/ha untuk asam humik sedangkan inokulan mikrob daun sebanyak 125 ml/petak untuk tiap satu kali penyemprotan. Tanaman yang digunakan adalah padi varietas IR 64. Hasil penelitian menunjukkan bahwa pertumbuhan vegetatif tanaman padi dapat ditingkatkan dengan penyemprotan mikrob daun, hal ini dapat dilihat dengan meningkatnya tinggi tanaman (7,90%), jumlah anakan (7,89%), jumlah anakan produktif (20,29%) sehingga dapat meningkatkan produksi gabah per rumpun (19,89%) terhadap perlakuan pemupukan standar. Penyemprotan asam humik dengan dosis 5 liter per hektar untuk setiap kali aplikasi memberikan respon positif ditunjukkan dengan meningkatnya bobot basah akar (43,48%), bobot kering akar (31,34%), bobot basah batang (73,89%), bobot kering batang (105,50%), bobot kering gabah per rumpun (30,58%) dan produksi gabah per rumpun (30,58%) terhadap perlakuan pemupukan standar. Perlakuan kombinasi antara mikrob daun dan asam humik dengan waktu aplikasi yang bersamaan meningkatkan pertumbuhan dan produksi padi sawah tetapi lebih rendah bila dibandingkan perlakuan tunggal.
Keyword: Asam humik, Pertumbuhan vegetatif tanaman padi

Judul: Pengaruh asam humat dan cara pemberiannya terhadap pertumbuhan dan produktivitas tanaman padi (Oryza sativa)
Abstrak: Agricultural land in Indonesia degraded continuously, characterized by decreasing in soil organic matter resulting from the utilization of chemical fertilizers which is not followed by organic fertilizers. In the rice field, the decrease of organic matter is followed by soil compacting and the decrease in soil pH. In order to increase paddy production, it is needed to improve the soil qualities plants growth. This can be achieved by providing ameliorants such as organic matter with chemical fertilizers. But there is a problem in applying organic matter because of its huge volume. Therefore, it is necessary to find a way to replace the organic matter with other materials that are easier not only in procurement but also in application. Humic acid is an extract of organic material which is expected to be able to replace the role of organic matter in improving physical, chemical, and biological properties of soils. Humic acid is expected to be able for improve plant growth through its role in accelerating the absorption of soil nutrients and water. The research was conducted in a greenhouse located at Cikabayan, Bogor Agricultural University with paddy var. Ciherang as the indicator plant. Soil was taken from Situ Gede, Bogor. Basal fertilizers were 300 kg/Ha SP-18, 200 kg/Ha KCl, and 200 kg/Ha urea. Humic acid dosages used were 0 L/Ha, 5 L/Ha, 10 L/Ha and 15 L/Ha. The methods of humic acid application were spraying on the surface of leaves, spraying underside of leaves, and spraying on the soil. The result showed that humic acid can increase the growth of rice plants by increasing tiller number. Humic acid dosage of 15 L/Ha spraying on the soil is the best treatment indicated by tiller number and dry weight of unhulled rice.
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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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