Judul: Pengaruh Pemberian Abu Sekam, P, dan K terhadap Pertumbuhan dan Produksi Kedelai Hitam pada Budi Daya Jenuh Air di Lahan Pasang Surut
Abstrak: The experiment was carried out to evaluate the effect of husk ash, phosphorus, and potassium fertilizer on the growth and production of black soybean under saturated soil culture on tidal swamps. The experiment was conducted in the tidal swamps of South Sumatera Province, Banyu Urip village, sub District of Tanjung Lago, Banyuasin District, Palembang since April to August 2014. This experiment was using Randomize Complete Block Design with three replications. The concentration of husk ash as the first factor consist of 0, 1 000, 2 000, 3 000 kg ha-1, the concentration of phosphorus fertilizer as the second factor consist of 36 and 72 kg ha-1 P2O5, and the concentration of potassium fertilizer as the third factor consist of 30 and 60 kg ha-1 K2O. Saturated soil culture (SSC) technique was used to support the cultivation of soybeans in tidal swamps. The results showed that the effect of husk ash concentration, interactions of husk ash and phosphorus fertilization, interaction of husk ash and potassium fertilization and interaction of husk ash, phosphorus and potassium fertilization increased the ammount of trifoliat leaves. The optimum combination of 1.26 ton ha-1 husk ash, 36 kg ha-1 P2O5 phosphorus fertilization and 30 kg ha- 1K2O potassium fertilization gave the highest productivity by 4.21 ton ha-1and decreased the dose of Phosphorus and Potassium fertilizer
Keyword: Bogor Agricultural University (IPB), under saturated soil culture, potassium, phosphorus, husk ash, black soybean

Judul: Pengaruh Pengapuran, P, dan K terhadap Pertumbuhan dan Produksi Kedelai Hitam pada Budi Daya Jenuh Air di Lahan Pasang Surut
Abstrak: This research was conducted to study the effect of lime ameliorant, P and K fertilizer on the growth and productivity of black soybean under saturated soil culture on tidal swamps, in Banyu Urip Village, Tanjung Lago Sub District, Banyuasin District, South Sumatera Province on May-August 2014. This experiment used Block Randomized Design, three factor with three replication. First factor is ameliorant of lime, consisted of 4 levels, i.e: 0, 1 000, 2 000 dan 3 000 kg ha-1 dolomit. Second factor is P fertilizer, consisted of 2 levels, i.e: 36 and 72 kg ha-1 P2O5 . Third factor is K fertilizer, consisted of 2 levels, i.e: 30 and 60 kg ha-1 K2O. This research result showed that the interaction P and K fertilizer influenced on the plant height, leave number, branch number, nodule dry weight, and productivity. The interaction P and lime influenced on the leave number on 8 Week After Planting. The interaction K and lime influenced on the branch number. The highest productivity was obtained on 3000 kg ha-1 dolomit (4.063 ton ha-1 ).
Keyword: Bogor Agricultural University (IPB), marginal land, saturated soil culture, ameliorant and fertilizer

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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