Judul: Optimasi Sistem Fertigasi pada Fertigator Otomatis Nirdaya (FONi) pada Budidaya Tanaman Selada dengan Algoritma Genetika
Abstrak: Budidaya selada yang hemat air sangat diperlukan dalam peningkatan kualitas produk. Fertigator Otomatis Nirdaya (FONi) adalah solusinya, namun belum terdapat optimasi irigasi dengan FONi untuk budidaya selada. Maka dari itu, dapat digunakan metode optimasi berupa Algoritma Genetika (AG). Adapun tujuan penelitian yaitu menguji performansi FONi, mengidentifikasi hubungan ketinggian air dan evapotranspirasi aktual (ETa) dengan Jaringan Saraf Tiruan (JST) untuk produktivitas tanaman selada, dan menentukan ketinggian air optimum dengan AG. Penelitian dilakukan pada lahan terbuka dengan menggunakan 4 skenario berupa variasi ketinggian air irigasi yaitu 8 cm (TA 1), 10 cm (TA 2), 12 cm (TA 3), dan 14 cm (TA 4) yang terdiri dari 6 ulangan. Hasil penelitian menunjukkan bahwa performansi FONi menghasilkan tanaman selada dengan jumlah daun dan tinggi tanaman yang meningkat bahkan setelah mengalami penurunan akibat curah hujan tinggi. Rata-rata jumlah daun dan tinggi tanaman, serta bobot panen terbaik yaitu dihasilkan oleh TA 1. Dilakukan pemodelan dengan JST dengan hasil R2 sebesar 0,9943 yang merepresentasikan bahwa model yang dikembangkan mampu menduga pertumbuhan tanaman dengan baik berdasarkan ketinggian air dan ETa. Optimasi melalui AG menghasilkan ketinggian air optimal sebesar 8,00 cm dengan peningkatan bobot sebesar 4,60% dibandingkan bobot skenario TA 1.
Keyword: Algoritma Genetika, FONi, Jaringan Saraf Tiruan, Irigasi, Selada

Judul: Evaluasi Penerapan Fertigator Otomatis Nirdaya (FONi) pada Budidaya Tanaman Selada dengan Berbagai Perlakuan Sistem Irigasi
Abstrak: Selada sebagai komoditas yang memiliki nilai ekonomis tinggi saat ini masih dibudidayakan di lahan terbuka yang boros air maupun dengan hidroponik yang boros energi dengan penggunaan pompa yang kontinyu. FONi yang dikembangkan dapat dijadikan solusi yang lebih hemat air dan energi. Tujuan penelitian adalah mengidentifikasi hubungan variasi ketinggian air irigasi dengan produktivitas tanaman selada, evapotranspirasi, dan menentukan tinggi air terbaik. Jaringan irigasi sistem FONi dibuat sebanyak 4 perlakuan ketinggian air irigasi, yaitu 8 (TA1), 10 (TA2), 12 (TA3), dan 14 cm (TA4). Hasil panen untuk TA1, TA2, TA3, dan TA4 sebesar 0,631 kg/m2, 0,449 kg/m2, 0,405 kg/m2, dan 0,188 kg/m2. Standar deviasi hasil panen secara berurut sebesar 0,157 kg/m2, 0,286 kg/m2, 0,090 kg/m2, dan 0.098 kg/m2. Perhitungan efisiensi air menghasilkan nilai secara berurut sebesar 92%, 77%, 59%, dan 58%. Produktivitas air dari masing-masing perlakuan secara berurut adalah 10,15 kg produk/m3 air, 5,55 kg produk/m3 air, 3,70 kg produk/m3 air, dan 1,59 kg produk/m3 air. Hasil ini menunjukkan bahwa TA1 8 cm merupakan variasi irigasi terbaik untuk pertumbuhan selada karena mampu menghasilkan selada dengan produktivitas air terbesar.
Keyword: evapotranspiration, irrigation, lettuce, plant productivity

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