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: The Growth and Tuber Yield of Sweetpotato (Ipomoea batatas L.) Ase Kapas at Various Rates of Nitrogen Fertilizer
Abstrak: Ubijalar merupakan tanaman pangan penting di Indonesia. Produktivitas ubijalar dapat dipengaruhi oleh pemupukan. Tujuan penelitian ini yaitu menentukan dosis nitrogen bagi pertumbuhan dan produksi ubijalar Ase Kapas. Penelitian dilakukan pada bulan Januari sampai Juli 2020 di Kebun Percobaan Cikabayan IPB dengan rancangan kelompok lengkap teracak dengan 3 ulangan. Dosis N yang diaplikasikan yaitu 0; 22,5; 45; 67,5; dan 90 kg ha-1 . Bahan tanam yang digunakan yaitu bagian stek pucuk. Curah hujan selama penelitian cenderung tidak sesuai dengan kondisi optimal pertumbuhan ubijalar. Pada tanah dengan kandungan nitrogen berstatus sedang (0,29% setara dengan 174 kg ha-1 ), dosis N tidak berpengaruh signifikan terhadap perubahan panjang dan diameter sulur, jumlah daun dan cabang, panjang dan diameter umbi, serta bobot basah dan kering umbi dan brangkasan. Pada tanah dengan kandungan N total sedang, dosis 0 kg N ha-1 dapat diaplikasikan untuk mendukung pertumbuhan dan produksi yang baik bagi ubijalar klon Ase Kapas., Sweetpotato is an essential crop plant in Indonesia. The productivity of the sweetpotato could be affected by fertilization. The objective of this research is to assess optimal nitrogen rate for growth and root yield of sweetpotato Ase Kapas. The experiment was conducted at IPB University experimental field Cikabayan from January to July 2020 used randomized complete block design with 3 replications. The level of nitrogen fertilizer consists of 0; 22,5; 45; 67,5; and 90 kg ha-1 . The planting material is the vine cuttings. The rainfall during this experiment tends to be insufficient as climate requirements. In the soil with moderate N content (0.29% equal to 174 kg ha-1 ), nitrogen had no significant effect on the growth of length and diameter of main stem, the amount of leaves and secondary stems, length and diameter of storage roots, wet- and dry-weight biomass of storage roots and aboveground part. In the soil with a moderate N total, dose of 0 kg N ha-1 could be applied to support good growth and yield of sweetpotato clone Ase Kapas.
Keyword: produktivitas, suplai nitrogen, umbi, Urea, nitrogen supply, storage root, productivity

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.
Keyword: