Judul: Pengayaan Superabsorben Onggok-Poliakrilamida dengan Urea Melalui Metode Perendaman.
Abstrak: Superabsorbent can be synthesized from onggok and polyacrylamide using ammonium persulfate and N,N'-methylene bis-acrylamide through grafting-crosslinking methods. Superabsorbent can be enriched with urea fertilizer with slow nutrient-release properties. This superabsorbent enrichment can overcome the losses caused by conventional urea use because urea contains nitrogen nutrient which utilization efficiency is difficult to be increased. Enrichment of superabsorbent with urea was carried out by soaking superabsorbent in urea solution. Maximum enrichment was obtained in superabsorbent soaked in 1000 ppm urea solution for 17 and 24 hours with loading percentage of 36.72 and 32.48%. The release of nitrogen was tested in static aqueous media. Superabsorbent immersed in 1000 ppm urea solution for 17 hours released nitrogen most slowly, in 5 days. Release rate of nitrogen was 0.0370 ppm/min, and the nitrogen release pattern was in accordance with the pattern of plant nutrient uptake.
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Judul: Urea Enrichment and Paraffin Coating on Onggok-Poliacrylamide Superabsorbent.
Abstrak: Superabsorben disintesis dengan menggunakan polimerisasi pencangkokantaut- silang, dengan onggok sebagai kerangka utama, akrilamida sebagai monomer, amonium persulfat sebagai inisiator, dan metilena bis-akrilamida sebagai penaut-silang. Superabsorben tanpa saponifikasi memiliki daya serap air sebesar 32.35 g/g, yang dengan saponifikasi meningkat menjadi 615.62 g/g. Pengayaan superabsorben dilakukan dengan merendam dalam larutan urea 1000 ppm selama 24 jam. Superabsorben tersebut dapat diaplikasikan sebagai media pembawa pupuk untuk tanaman dan sebagai pengondisi tanah. Superabsorben yang telah diperkaya oleh urea kemudian dilapisi dengan parafin 3, 6, dan 10%. Superabsorben tanpa pelapisan parafin melepaskan nitrogen sebesar 100% dalam waktu 240 menit, sedangkan superabsorben dengan pelapisan parafin 3% melepaskan nitrogen 100% dalam waktu 2 hari. Pelepasan nitrogen dalam waktu 2 hari dari superabsorben dengan parafin 6 dan 10% berturut-turut sebesar 68.40 dan 53.54%. Pelepasan nitrogen secara perlahan dengan cara pelapisan superabsorben dengan parafin dapat mengurangi besarnya nitrogen yang hilang dan dampak negatif terhadap lingkungan.
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Judul: Etno-ornitologi Burung Kancilan Flores (Pachycephala nudigula nudigula Hartert 1897) pada Masyarakat Lio di Taman Nasional Kelimutu
Abstrak: Bare-throathed whistler is one of several wild birds in Kelimutu National Park (TNKL) that is believed to have correlation with Lio Community‟s belief. The estimation of Bare-throated whistler‟s population in Kelimutu National Park was about 186.41-1668.07 individual by the density about 0.0389-0.3481 ind/ha with the sex ratio 6.2:1 that spreaded on area with height of 1100 – 1600 masl. The characteristic of Bare-throated whistler‟s habitat is a natural forest with various canopy level, high plant species diversity and high density. The habitat characteristics related to the availability of food in the form of insects, cover, safety and a nesting site. Generally the most of Lio community knew the existence of Bare-throated whistler directly or from their parents‟ stories. The perceptions of Lio Community to the Bare-throated whistler‟s existence is generally support the conservation efforts. The perceptions construct the Lio Community‟s atitude that tend to be conservative to the existence of Bare-throated whistler. The attitude shown by their behavior that not cathing the Bare-throated whistler from the TNKL‟s area or the outside. The attitude have an important role to the existence of Bare-throated whistler in Kelimutu National Park‟s area.
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