Judul: Uji Orientasi Arah Penempatan Sensor Tube Solarimeter terhadap Pengukuran Koefisien Transmisi pada Pertanaman Jagung Manis
Abstrak: Radiasi yang terbaca di bawah tajuk merupakan fungsi sudut datang matahari dan karakter tajuk tanaman. Arah penempatan alat ukur yang tidak tepat berpotensi membiaskan hasil pengukuran. Orientasi alat ukur radiasi transmisi yang berbeda di bawah tajuk tanaman jagung manis (Zea mays saccharata Sturt.) perlu diuji coba. Penelitian ini bertujuan untuk mengevaluasi penempatan solarimeter yang tepat, menerangkan karakter transmisi radiasi di bawah tajuk dan koefisien pemadaman tajuk tanaman jagung manis dalam berbagai perlakuan arah baris dan jarak tanam. Penelitian dilakukan pada bulan Maret hingga Juni 2013 berlokasi di Dramaga, Bogor, Jawa Barat pada ketinggian 240 meter diatas permukaan laut. Hasil penelitian menunjukkan bahwa respon sensor semakin seragam dengan bertambahnya indeks luas daun. Sensor yang ditempatan dengan posisi diagonal mampu menghasilkan nilai transmitansi yang konsisten terhadap arah sudut datang matahari berbeda pada semua perlakuan. Radiasi yang ditransmisikan tanaman jagung manis menurun dengan peningkatan indeks luas daun dan konstan pada nilai 0.6 setelah indeks luas daun (ILD) melebihi 1. Nilai koefisien pemadaman tajuk (k) berbanding terbalik dengan nilai indeks luas daun dan konstan pada rataan nilai 0.3 setelah ILD mencapai 1. Nilai k perlakuan Utara Selatan rapat 13% lebih besar dari perlakuan lainnya yang mengindikasikan intersepsi radiasi lebih optimal.
Keyword: orientasi sensor tube solarimeter, transmisi radiasi, koefisien pemadaman tajuk, jagung manis.

Judul: Karakteristik Intersepsi Radiasi Matahari dan Produksi Tanaman Jagung Manis pada Arah Baris dan Kerapatan Berbeda
Abstrak: This study was conducted to determine the effect of row planting direction and plant population density on the change of specific leaf area (SLA), leaf area index (LAI), radiation use efficiency (RUE) and growth of sweet corn. The research was conducted from March to June 2013 in Cikabayan Research Station IPB Darmaga-Bogor, West Java, at altitude of ± 240 masl. The row planting direction was TB (East-West direction) and US (North-South direction). The planting spacing was J20 (70 x 20 cm) and J40 (70 x 40 cm). The meteorology factors being observed were the intensity of radiation, air temperature and humidity. Agronomic variables factors being observed were plant height, number of leaves, dry weight and yield component. The results showed the combination treatment of row direction and planting spacing did not significantly affect plant height, leaf number and total dry weight. However, the treatment has significant affect on dry plant at harvest. The interception of solar radiation in US treatment was 11% higher than the TB, while J20 treatment has 3% higher than J40. Radiation use eficiency of treatment TBJ20, TBJ40, USJ20, USJ40 were 2.97, 2.75, 3.16, and 3.14 g MJ-1 respectively. Dry seed yield of J20 was 5.98 ton ha-1, which was 20% greater than J40 population. Harvest index for TBJ20, TBJ40, USJ20 and USJ40 are 0.23, 0.19, 0.25 and 0.20.
Keyword: planting density, row direction, harvesting product, biomass production, radiation use efficiency, sweet corn

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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