Judul: Pengaruh biomassa tanaman legum dan pemupukan P terhadap pertumbuhan serta produksi tanaman sorghum pada latosol Darmaga
Abstrak: Salah satu cara untuk meningkatkan kadar P tcrsedia guna meningkatkan produksi tanaman adalah dengan penambahan bahan organik, yaitu dengan pemanfaatan tanaman 1egume cover crop ((LCC). Bahan organik berfungsi sebagai sumber energi bagi mikroorganisme dan merangsang kegiatan biokimia dalam tanah, sehingga dapat meningkatkan ketersediaan P bagi mikroorganisme dan tanaman.
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Judul: Pengaruh biomassa tanaman legum dan pemupukan P terhadap pertumbuhan serta produksi tanaman sorghum pada latosol Darmaga
Abstrak: Cipta Hak Salah satu cara untuk meningkatkan kadar P tersedia guna meningkatkan produksi tanaman adalah dengan penambahan bahan organik, yaitu dengan pemanfautan tanaman legume cover crop (LCC). Bahan organik berfungsi sebagai sumber energi bagi mikroorganisme dan merangsang kegiatan biokimia dalam tanah, sehingga dapat meningkatkan ketersediaan P bagi mikroorganisme dan tanaman. mi IP Penelitian ini bertujuan untuk mempelajari pengaruh pemberian biomassa tanaman legume cover crop (LCC) jenis Colopogonium caereleum (Cc), Pueraria javanica (Pj), dan Centrosema pebuscencs (Cp), dan pemupukan P terhadap tinggi tanaman, jumlah tanaman, bobot brangkasan, dan produksi biji tanaman sorghum var. Darso pada Latosol Darmaga. Penelitian ini merupakan percobaan faktorial yang ditempatkan dalam Rancangan Acak. Kelompok dengan tiga ulangan. Sebagai faktor pertama adalah jenis tanaman legum yaitu: Colopogonium caereleum (CC), Pueraria javanica (Pj), dan Centrosema pebuscencs (Cp), dan faktor kedua adalah dosis pemupukan P (SP-36) yaitu: satu dosis anjuran SP-36 (312 kg/ha), dan setengah dosis anjuran SP-36 (156 kg/ha). Hasil penelitian menunjukkan bahwa pengaruh jenis LCC dan dosis pemupukan P terhadap tinggi tanaman, jumlah tanaman, bobot brangkasan, dan bobot produksi biji tanaman sorghum var. Darso bersifat tidak nyata, sedangkan kelompok (bekas penggunaan lahan) berpengaruh nyata terhadap bobot brangkasan. Tinggi tanaman, jumlah tanaman, tobot brangkasan, dan bobot produksi biji dengan penggunaan LCC cenderung lebih tinggi bila dibandingkan tanpa penggunaan LCC (kontrol). Pertumbuhan dan produksi biji tanaman sorghum pada setengah dosis anjuran SP-36 (156 kg/ha) cenderung lebih tinggi bila dibandingkan dengan satu dosis anjuran SP-36 (312 kg/ha). Lahan bekas diberakan memiliki bobot brangkasan (ton/ha) yang lebih tinggi bila dibandingkan dengan lahan bekas tanaman singkong dan bekas lahan campuran.
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Judul: Phylogeography and Species Limits in the Papuan White Snake (Micropechis ikaheka) (Reptilia: Serpentes: Elapidae)
Abstrak: Papua white snake, Micropechis ikaheka, has been distingushed into two subspecies M.i. ikaheka and M.i. fasciatus. However, due to lack of data on their morphology, distribution and ecology, both subspecies often ignored in scintific discussions and refers only byas , Micropechis ikaheka. This study was designed to document the differences between M.i. ikaheka and M.i fasciatus by using scales characteristics and reproductive organ or hemipenes. The study also examine, zoogeography, habitat, diet and cannibalism of both subspecies to better understanding the the ecology of one of the most venomous snakes in the world. This study consists of three topics with method and also different in the size samples, respectively. The first study is the histology and microtopography of the skin were studied using paraffin method and Scanning Electron Microscope (SEM). The second is the hemipenis were examined by following Myers and Cadle (2003), and Zaher and Prudente (2003). The third is the abdominal surgery was carried out to document diet type and the investigate phenomenon of cannibalism in the snake. Specimens for this study came from the collection from Museum Zoologicum Bogoriense (MZB) and Universitas Negeri Papua’s Laboratory (LZU). The research result also indicated that the markers of skin and hemipenis described the same structure and microornamentation in all M. ikaheka groups being compared. Based specimens examined morphological descriptions do not s support the further differentiation in Micropechis. In short, two markers that used in this study could not sufficiently indicate the differences in the level of species and subspecies of M. ikaheka. The study, however, were able to delineate zoogeography and skin color patterns, which fall into four groups: M. i. ikaheka; M. i. fasciatus. M. i. ssp. “intermediate”; and M. i. ssp “black”. This study also revealed that color variations did not overlap in their geographic distribution. It is therefore, it suggested that environmental factors may contribute to the skin color variations. It also assumed that habitat discontinuous and biogeography factors may also cause the loss of the connection between the original populations (vicarians) or follow colonization events (dispersal). The examined of 22 stomach contents of M. ikaheka shows this species is carnivorous, and prey on vertebrates such as amphibians, fish, reptiles, and Mammals. These snakes are opportunistic predators since they prey on all that can be captured, but mainly reptiles (61.5%), followed by mammals and fish (both 15.4%), and amphibians (7.7%). Although categorized as terrestrial animal, the diet study showed that M. ikaheka snakes often go into the water to hunt for fish (the sample from Yapen island), including eel (the sample from Aru island). Based on prey items indentified, there is evidence that M. ikaheka is cannibal. At this time, there still no record on reason for cannibalism, but it is assumed that cannibalism was due to competition between populations and means to control population.
Keyword: geographic variation, white snake, papua