Judul: Produksi benih umbi mini kentang (Solanum tuberosum L.) secara aeroponik melalui induksi pengumbian
Abstrak: Low productivity of potato Indonesia is mainly caused by low utilization of quality potato seed. The availability of nationally certified potato in Indonesia is only 15% total of 103,582 ton of year. Mini tuber production by spraying nutrient to plant roots as aeroponics system, began to developed in Indonesia. Conventional production system produced abi.mt3-5 tuber per plant, while aeroponics system about 16-29 tubers per plant. The absence of barrier in the root on aeroponics system made stolon number more than 10, while the number of secondary stolon branches from 10-15. However, the of tuber formation was estimated only 5-10% of total of 100-150 stolons per plant. it is still a high potency to the number tubers by various' ways. This of was to rate application of NPK foliar and paclobutrazol (PBZ) to increase potato mini tuber production on aeroponics system. was conducted in a plastic house in Lembang, West Bandung, West Java, Indonesia, from December 2010 to October 201 The research 1 a was conducted to mini tuber production using several rates of nitrogen foliar fertilizer. Randomized Block Design was used with one factor of nitrogen foliar rates 0, 500, 1000, 2000, and 4000 mg N L-' tra..flsplanting (WA T) weekly. The results that Ca(N03h tuber weight plant significantly by 17%, from but there was no increasing tuber fonnation from stolon on yet. The optimum rate of foliar of Ca(N03h for was 2173 rrig N . The of 1 b was conducted to increase mini tuber production using rates of fosfor foliar fertilizer. Randomized Block Design was used with one factor of fosfor foliar fertilizer rates i.e. 0, 100, 200, 400, and 800 mg P in six replications. The foliar fertilizer H3P04 was applied at 1-4 W A T weekly. The showed that foliar fertilizer of H3P04 increased number mediumtubers significantly by 25% from 12.7 to 16.8, but there was no increasing tuber formation from stolon on aeroponics yet. optimum rate of foliar fertilizer of H3P04 for number was P The research of 1 c was conducted to increase mini tuber production several rates potassium foliar fertilizer. Randomized Block was used with one factor of potassium foliar fertilizer rates 0, 250, 500, 1000, and 2000 mg K L-1 in six replications. The foliar of was applied at 2-8 WAT weekly. results showed that fertilizer of K2S04 increased tuber plant significantly by 26% from 53.2 to 71.6 but there was no increasing fonnation from stolon on aeroponics yet. The optimum rate of foliar fertilizer of K2S04 tuber per plant was 1917 mg . of 2 was conducted to tuber production by application times of N+P and Randomized Block ------- Design was used with two treatment factors in three replications. The first treatment factor was application times ofN+P foliar fertilizer i.e. 1-3 WAT, 1-4 WAT, 1-5 W AT, and 1-6 W A T. The second treatment factor was application times of K foliar fertilizer i.e. 1-8 WAT, 2-8 W AT, 3-8 W AT, 4-8 W AT, and 5-8 WAT. The results showed that the application time of N+P foliar fertilizer which was 1-4 WAT
Keyword: Ca(N03h, H3P04, KjS04, paclobutrazol, foliar fei-tilizer, stolon

Judul: Pengembangan zone cooling system untuk produksi benih kentang secara aeroponik di dataran rendah tropika basah
Abstrak: Potato plant (Solanum tuberosum L) is one of the major food crops in the world after paddy, wheat, and corn. Carbohydrate content of potato is very high; therefore, it can be used to substitute rice, wheat flour, and maize. As one of the most important commodities, potato has comparative and competitive advantages, as well as good domestic and export market. However in Indonesia, the volume of potato production is lower than the volume of potato consumption. Therefore, Indonesia is importing potato from other countries. To increase potato production, Indonesia is facing difficulties in fulfilling the required potato seeds with high quality, right time and right variety. Using low quality potato seeds causes low productivity. In addition, increasing potato production is also facing problems related to the decrease in area for potato plant in highland, pest and plant diseases. In Indonesia, potato plant is generally cultivated on highland. This is very often accompanied by high rate in soil erosion. Shifting the orientation for potato cultivation to lowland is one of the most prospective solutions to increase potato production while solving the problems related to soil erosion. However, potato cultivation in humid tropical lowland is facing problems related to high air temperature and humidity. To overcome these problems, root zone cooling for aeroponically grown potato cultivation could be used. Zone cooling system could decrease temperature of certain zone but it also prevents the increase in air humidity. The objective of this research in general was to develop technology for aeroponically grown potato seed production in humid tropical lowland by using root zone cooling. To achieve the objective, three stages of research were conducted: (1) to apply zone cooling in aeroponic system for potato seed production in humid tropical lowland, (2) to predict temperature distribution in the growth chamber of aeroponic system with root zone cooling, (3) to calculate the heat load in the growth chamber of aeroponic system with root zone cooling. The research on zone cooling application was conducted in a greenhouse at the Department of Mechanical & Bio-system Engineering, Faculty of Agricultural Engineering and Technology, Bogor Agricultural University, at 250 m above the sea level, from April to July, 2012. The size of the aeroponic chamber used was 1.5 m x 1 m x 1 m. The material used for the outer wall of the chamber was wooden multiplex board and the inner side was insulated with styrofoam board. Plant bedding was made of styrofoam board. Plant spacing was 15 cm x 15 cm. Therefore, one chamber consisted of 45 plants. The variety of potato seedling was Granola, produced by tissue culture laboratory, Vegetable Research Institute, Indonesian Ministry of Agriculture, after acclimatization. The research results indicated that the values of average height and number of leave of the potato plant cultivated in aeroponic system with zone cooling were higher than that of without cooling. The best tubers were obtained in aeroponic system with 10 °C zone cooling, i.e., average productivity (579 tubers/m2), average number of tuber (14.85 tubers/plant), and average tuber weight (409.15 mg/tuber). The 15 °C zone cooling resulted in 55
Keyword: potato, humid tropical lowland, aeroponics, zone cooling, CFD

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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