Judul: Penggunaan Diuron Dalam Mengendalikan Gulma Pada Pertanaman Tebu (Saccharurn Officinamm L.) Lahan Kering
Abstrak: Penelitian ini bertujuan untuk mengetahui efektivitas diuron pada beberapa tingkat dosis dan formulasi dalam mengendalikan gulma pada pertanaman tebu lahan kering.
Keyword: 

Judul: Pengaruh herbisida diuron 78.5% WP terhadap pengendalian gulma pada pertanaman tebu (Saccharum officinarum L.)
Abstrak: Percobaan ini dilakukan untuk mengetahui pengaruh dan keefektifan herbisida Maron 80 WP ( Diuron 78.5 %) pada berbagai tingkat dosis dalam mengendalikan gulma pada pertanaman tebu. Penelitian ini dilakukan di PG Rajawali II Subang Jawa Barat pada bulan Desember 2010 sampai Maret 2011. Penelitian menggunakan rancangan acak kelompok dengan faktor tunggal dan terdiri dari empat ulangan. Perlakuan yang diberikan adalah : Herbisida Maron 80 WP dengan dosis 2.0 kg/ha, herbisida Maron 80 WP dengan dosis 1.5 kg/ha, Herbisida Maron 80 WP dengan dosis 1.0 kg/ha, Herbisida Maron 80 WP dengan dosis 0.5 kg/ha, pengendalian manual dan kontrol. Berdasarkan analisis vegetasi sebelum aplikasi herbisida didapatkan empat spesies gulma dominan yaitu Digitaria adscendes, Borreria alata, Cleome rutidosperma dan Brachiaria distachya. Spesies gulma lain sebelum aplikasi herbisida ini adalah Cynodon dactylon, Croton hirtus, Alocasia maccorhiza. Hasil analisis vegetasi akhir memberikan gambaran umum tentang dominasi gulma setelah aplikasi herbisida. Perlakuan herbisida Maron 80 WP (Diuron 78.5%) pada semua taraf dosis yang diberikan cukup efektif dalam mengendalikan gulma hingga 10 Minggu Setelah Aplikasi (MSA). Secara umum aplikasi herbisida Maron 80 WP (Diuron 78.5%) memberikan hasil yang berbeda nyata dengan perlakuan tanpa pengendalian (kontrol) dalam menekan bobot kering gulma total, gulma daun lebar dan gulma rumput. Perlakuan pengendalian manual kurang efektif dalam mengendalikan gulma dipertanaman tebu lahan kering. Hal ini dilihat dari biaya pengendalian yang cukup tinggi yaitu Rp. 350.000,00/ha dan bobot kering gulma yang masih tinggi. Selama percobaan tidak ditemukan gejala keracunan pada tanaman tebu yang sampai mematikan tanaman. Gejala keracunan ringan hanya terdapat pada sebagian kecil tanaman contoh yang diamati.
Keyword: 

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