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: Pengayaan pupuk organik dengan pupuk hayati untuk meningkatkan efisiensi penggunaan hara, pertumbuhan, dan produksi tanaman cabai, The Enrichment of Organic Fertilizer with Biofertilizer to Improve Nutrient Use Efficiency, Growth, and Yield of Red Chili).
Abstrak: Red chili production in Indonesia is low due to low soil productivity. Soil productivity can be increased by using biofertilizer. Biofertilizer can improve plant growth, yield, and soil quality. The aim of this study was to study influence of enriched compost and ordinary compost to increase nutrient use efficiency, growth, and yield of red chili. This study used biofertilizer which consisted of Bacillus subtilis (strain HU48), Pseudomonas beteli (strain ATCC1986IT), Azotobacter sp. (strain HY1141), and Azospirillum sp. (strain NS01). The experiment was conducted in the field using randomized block design (RBD) with two factors and three replications. The first factor was organic fertilizer that consisted of ordinary compost (O1), enriched compost (O2), and compost added biofertilizer when planted (O3). The second factor was inorganic fertilizer that consisted of 50% dosage of NPK and 100% dosage of NPK. The plants were grown on plots of 3 m x 3 m with a plant distance about 50 cm x 60 cm. The observed parameters were nutrient use efficiency, plant growth, and yield. The results showed that biofertilizer increased plant nutrient uttilization efficiency, plant growth, and yield by 65 %, 59%, and 126%, respectively. The combination of enriched compost and 50% dosage of NPK (O2A1) had the highest plant nutrient uttilization efficiency, plant growth, and yield than the other treatment.
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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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