Judul: Pemanfaatan Kitosan dan Media Organik untuk Pertumbuhan dan Produktivitas Tanaman Cabai Merah (Capsicum annum L.) di Screenhouse
Abstrak: Indonesian farmer incapable of fulfilling chili demands due to low productivity. Chitosan are capable of increasing productivity and inducing disease resistance against various pathogens. This research conducted to meet the best concentration of chitosan when combined with soil and manure as fertilizer. The combinations of soil and manure were 70%:30% (P1), 50%:50% (P2), and 30%:70% (P3), and the plants were sprayed with variation of chitosan concentration (0, 2, 4, 6, and 8 ml/L). The measured parameters were plant heights, number of leaves, stem diameters, number of flowers and fruits, and fruit weights. Only number of flowers and fruits, and fruit weights showed significant results based on Duncan test 5%. The combination of P2 medium with 2 ml/L of chitosan was the best combination for increasing flowers in week 13th (10) and fruit in week 15th (24.33) significantly. The combination of P2 medium with 4 ml/L of chitosan was the best combination for increasing fruit weights in week 18th (75.67 gr) significantly. Chitosan can also increase plant recovery time when damaged by disease.
Keyword: Bogor Agricultural University, 50:50 of soil and manure composition, chitosan concentration, chili plant productivity

Judul: Efektivitas Penggunaan Pupuk Organik yang diperkaya Mikrob Aktivator dalam Mengatur Keseimbangan Tajuk dan Akar Tanaman Cabai (Capsicum annuum. L)
Abstrak: The aim of this research was to evaluate the effect of enriched biofertilizer in some dosed for balancing shoot and root growth of red chili (Capsicum annuum. L) to support productivity and for biocontrol of pest and disease. The activator microbes used in this research belongs to Plant Growth Promoting Rhizobacteria (PGPR), consist of : Azospirillum sp. (Strain NS01), Azotobacter sp. (Strain HY1141), Bacillus subtilis (Strain HU48), and Pseudomonas beteli (Strain ATCC1986IT). The experiment was carried out in green house by Completley Randomize Design Method that consist of 6 treatments and 9 replications. The treatments were soil with unriched biofertilizer in 2:1 dosed (P1), soil with enriched biofertilizer in 2:1 dosed (P2), soil with unriched biofertilizer in 3:1 dosed (P3), soil with enriched biofertilizer in 3:1 dosed (P4), soil with anorganic fertilizer (NPK) and soil without any fertilizer (Ko). The result showed that application of enriched biofertilizers by activator microbes increased macro nutrients C, N, P, K, Ca and Mg in biofertilizers, increased growth and balancing of red chili. Application of enriched biofertilizers also increased imunity of red chili from pest and disease.
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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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