Judul: Pengaruh Trass dan Pupuk Fosfor terhadap Pertumbuhan dan Produksi Padi Gogo serta Perubahan Sifat Kimia pada Latosol Gunung Sindur
Abstrak: The high conversion of rice fields to non-agricultural fields have reduced rice production, so it needs the utilization of dry land for paddy cultivation. Latosol is one type of nutrient-poor soils, especially Silica (Si) and phosphorus (P), and generally it is acidic due to further weathering and intensive leaching. This study aimed to determine the effect of Trass and Phosphorus (P) on yield and nutrient uptake of rice plants, as well as changes in the chemical properties of Mount Sindur’s Latosol. This study was a greenhouse experiment conducted in Cikabayan University Farm, Bogor Agricultural University. Soil and plant analysis carried out in the Laboratory of Chemistry and Soil Fertility, Department of Soil Science and Land Resources, Faculty of Agriculture, Bogor Agricultural University. This study took place from October 2012 to April 2013. This experiment used a completely randomized design (CRD) with 2 factors. As the first factor was Trass doses (0 tonnes / ha (T0), 2.37 tonnes / ha (T1), 4.74 tonnes / ha (T2), and 7.11 tons / ha (T3). Second factor was P fertilizer (0 ppm P (P0), 50 ppm P (P1), and 100 ppm (P2). Experiment was repeated 3 times so that there were 36 experimental units. Results showed that there was no interaction effect between Trass and phosphorus in all observed variables. But as a single factor, Trass significantly affect to increase the number of productive tillers in treatment T3 equal to 17.5%, while the increasing amount of soil available-P influence T1, T2, and T3 treatments, respectively for 25%, 62.5, and 149.4%. Further, there was an increase in P-uptake effect on T1, T2, and T3 treatments, respectively for 4.5%, 9.5%, and 24.3%. Moreover, P Fertilizer application was significantly affect the increasing of plant height on P1 and P2 treatments, respectively for 17:45% and 17.6%, number of tillers earnings 3.8% and 20%, biomass weight for 108.4% and 159.7%, and the grain weight for 47.9% and 52.1%, while the increase effect on Si-uptake of P1 and P2 treatments, respectively for 62.07% and 87 %, and decrease the available-Si, respectively for 9.1% and 22.5%.
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Judul: Pengaruh Trass dan SP36 pada Produksi Padi Sawah serta Perubahan Sifat Kimia Latosol Gunung Sindur yang Disawahkan
Abstrak: The increase of food requirements was followed by the use of weathered soil for agricultural land. Latosol is one of wheatered and poor acid soils, including silicon and phosphorus, which is likely to be used as paddy fields. Paddy as Si accumulator plants require huge silicon, whereas phosphorus plays an important role in energy transfer of plant metabolic processes. This study aims to determine the effect of Trass and SP36 on yield, nutrient uptake of paddy, also chemical changes on paddy soil of Latosol Gunung Sindur. Completely randomized design was used in greenhouse experiment. Trass as a source of Si was applied in four dosages, ie without Trass, 105 g/pot, 210 g/pot, and 315 g/pot. SP36 as a source of P was applied in three dosages, ie without SP36, 4.5 g/pot and 9 g/pot. First, Trass and SP36 at appropriate dosage was applied in trial pot and being incubated for a month. At the end of the incubation period every pot was planted with four rice seedlings. Harvesting was done when the plant age about 13 weeks, after that experimented plant tissue and soil was been analysed. The trials showed SP36 significantly increased plant height, number of tillers, straw weight, uptake of Si, K, P, and N of paddy. Trass significantly increased plant height, soil pH, and soil available P. Trass and SP36 together significantly increased available of Si and Si content in plant tissue. The increase of available P and Si in soil increased the uptake of P and Si of paddy, thus improved the growth.
Keyword: trass, silicon, phosphor, latosol

Judul: Embriogenesis ikan buta (Astyanax fasciatus)
Abstrak: Ikan buta Astyanax fasciatus adalah spesies ikan unik dari famili Characidae yang menempati perairan dalam gua di Wilayah La Cueva Chica-San Luis Potasi-Mexico. Ikan ini memiliki mata yang tereduksi (Blind Cavefish) dan warna kulit merah muda, pucat serta mengkilap.
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