Judul: The Production and Application of Liquid Organic Fertilizer (LOF) as Nutrient Substitution of AB Mix on the Mustard Green Growth (Brassica juncea L.) in the Hydroponic Wick System
Abstrak: Limbah kulit nanas dan cangkang telur ayam dapat dimanfaatkan sebagai pupuk organik cair (POC). Penelitian ini bertujuan mengetahui kualitas POC berbahan dasar limbah kulit nanas dan cangkang telur ayam, mengetahui pengaruh POC terhadap pertumbuhan tanaman caisim pada hidroponik wick system, dan mengetahui apakah POC dapat digunakan sebagai substitusi nutrisi AB Mix. Lokasi penelitian dilakukan di Laboratorium Kimia dan Kesuburan Tanah dan Kebun Percobaan DITSL, IPB. Hasil fermentasi limbah kulit nanas dan cangkang telur ayam disebut POC NC. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dengan lima taraf perlakuan dan tiga kali ulangan di setiap tarafnya. Taraf perlakuan di antaranya P0 (Kontrol), P1 (Nutrisi AB Mix), P2 (POC NC 150%), P3 (POC NC 100%), P4 (POC NC 50) dengan tiga kali ulangan. Analisis data menggunakan sidik ragam (ANOVA) dan uji DMRT. Pembuatan POC melalui tahap fermentasi selama 21 hari. Hasil analisis menunjukkan kadar hara POC belum memenuhi standar Kementerian Pertanian. Pemberian POC berpengaruh terhadap pertumbuhan tanaman caisim. Tanaman caisim dengan perlakuan POC NC pada dua MST menghasilkan pertumbuhan yang jauh lebih rendah dibanding perlakuan AB Mix, sehingga dibutuhkan penambahan Ca(NO3)2 sebanyak 400 ppm untuk meningkatkan kadar hara nitrogen yang dapat diserap oleh tanaman. Seluruh parameter pengamatan menunjukkan perlakuan dengan taraf terendah yaitu 50% menghasilkan pertumbuhan yang baik dibanding perlakuan kontrol. Pemberian POC pada pertumbuhan tanaman caisim belum mampu menjadi substitusi nutrisi AB Mix pada sistem hidroponik., The wastes of pineapple fruit peel and chicken egg shells could be processed into liquid organic fertilizer (LOF). This study was aimed to know the quality of LOF made from the wastes of pineapple fruit peel and chicken egg shells, the effect of LOF on the mustard green grown in the hydroponic wick system, and whether LOF can be used as a substitute for AB Mix. The research location was carried out at the Chemistry and Soil Fertility Laboratory and Cikabayan Experimental Station, IPB University. The fermented of pineapple peel waste and chicken egg shells waste was called LOF NC. This experiment used a completely randomized design (CRD) with five levels of treatments. The treatments consisted of P0 (Control), P1 (AB Mix Nutrition), P2 (LOF NC 150%), P3 (LOF NC 100%), P4 (LOF NC 50%) on three replications. Data well analyzed using analysis of variance (ANOVA) and DMRT test. The fermentation of LOF NC was 21 days. The results showed that LOF nutrient levels did not meet the standard of the ministry of agriculture. The treatment of LOF affected the growth of mustard green. All observation parameters showed that the treatment of 50% level LOF produced highest yield as compared with control. This treatment of LOF could not substitute the AB Mix in the hydroponic system.
Keyword: Chicken Egg Shells Waste, Pineapple Peel Waste, Nutrient Content

Judul: The Production and Application of Liquid Organic Fertilizer (LOF) as Nutrient Substitution of AB Mix on the Water Spinach (Ipomoea reptans) Growth in the Hydroponic Wick System
Abstrak: Nutrisi AB mix yang beredar di pasaran memiliki harga yang relatif tinggi, sehingga dibutuhkan alternatif lain yang lebih ekonomis. Salah satu alternatif yang dapat dilakukan adalah dengan menggunakan Pupuk Organik Cair (POC) buatan sendiri. Penelitian ini dilakukan untuk mengetahui kualitas POC berbahan dasar limbah kulit pisang dan cangkang telur ayam, mengetahui pengaruh POC terhadap pertumbuhan tanaman kangkung pada hidroponik wick system, dan mengetahui apakah POC dapat digunakan sebagai substitusi nutrisi AB mix. Tahapan penelitian meliputi tiga tahap, tahap pertama merupakan analisis unsur hara bahan baku. Tahap kedua, pembuatan POC dan analisis unsur hara. Hasil fermentasi pupuk disebut POC PT. Tahap ketiga, uji tanam pada tanaman kangkung pada hidroponik wick system. Percobaan disusun menggunakan Rancangan Acak Lengkap (RAL) dengan lima perlakuan pupuk yaitu P0 (kontrol), P1 (nutrisi AB mix), P2 (POC PT 150%), P3 (POC PT 100%), P4 (POC PT 50%) dengan tiga kali ulangan. Analisis data menggunakan sidik ragam (ANOVA) dan uji DMRT. Hasil analisis menunjukkan bahwa POC yang telah difermentasi selama tiga minggu memiliki kandungan unsur hara yang rendah dan belum memenuhi standar Kementerian Pertanian. Hasil uji tanam pada perlakuan POC PT di satu MST menghasilkan nilai pertumbuhan tanaman lebih rendah dibandingkan dengan perlakuan nutrisi AB mix sehingga perlu dilakukan penambahan pupuk Ca(NO3)2. Perlakuan POC PT memiliki nilai yang lebih tinggi dibandingkan dengan perlakuan kontrol pada seluruh parameter pertumbuhan tanaman kangkung. POC PT sebagai substitusi nutrisi AB mix belum mampu memberikan pertumbuhan optimal pada pertumbuhan kangkung di hidroponik wick system, The price of AB mix is relatively high, so it needed to find another alternative with a more economically price. One of alternative was Liquid Organic Fertilizer (LOF). This study was aimed to know the quality of LOF made from banana peel and chicken egg shells, the effect of LOF on the water spinach grown in the hydroponic wick system, and whether LOF can be used as a substitute for AB mix. The experiment consisted of three stages. First stage was nutrients analysis of raw materials. Second stage was the production of LOF and nutrients analysis. The results of fermented fertilizers called POC PT. Third stage was experiment on water spinach in a hydroponic wick system. The experiment used Completely Randomized Design (CRD) with five fertilizer treatments, namely P0 (control), P1 (AB mix nutrition), P2 (LOF PT 150%), P3 (LOF PT 100%), P4 (LOF PT 50%) in three replications. Data was analyzed using analysis of variance (ANOVA) and DMRT test. The experiment showed that LOF which was fermented for 3 weeks have a low nutrient content and below the standard of Ministry of Agriculture. The results showed that LOF PT in one week after planting have lower plant growth compare to the AB mix nutrient so it was necessary to add Ca(NO3)2 fertilizer. The LOF PT treatment have higher plant growth parameter than the control treatment. Thus, the treatment of LOF PT could not subtitue AB mix.
Keyword: pupuk organik cair, limbah cangkang telur, limbah kulit pisang, fermentation, chicken egg shells, banana peel waste

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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