Judul: Respon Pertumbuhan Bibit Salam (Syzygium polyanthum) terhadap Pemberian Pupuk Kandang Sapi dan Arang Sekam pada Tanah Tercemar Oli Bekas
Abstrak: Tanaman salam (Syzygium polyanthum) dapat tumbuh di tanah miskin hara, seperti tanah tercemar oli bekas. Penanaman bibit salam dengan pemberian pupuk kandang sapi dan arang sekam diharapkan mampu mengurangi dampak pencemaran oli bekas. Penelitian ini bertujuan menganalisis dosis optimal untuk meningkatkan pertumbuhan bibit salam terhadap pemberian pupuk kandang sapi dan arang sekam pada tanah tercemar oli bekas dengan konsentrasi 60 ml/1 kg tanah. Penelitian menggunakan rancangan acak lengkap faktorial dengan dua faktor dan uji analisis tanah. Hasil penelitian menunjukkan pemberian pupuk kandang sapi dan interaksinya dengan arang sekam berpengaruh nyata terhadap parameter nisbah pucuk akar (NPA). Pemberian kombinasi 60 gram pupuk kandang sapi dan 60 gram arang sekam memiliki nilai NPA terbaik sebesar 3,11. Pemberian pupuk kandang sapi dan arang sekam pada tanah tercemar oli bekas mampu menurunkan kandungan Al, Zn, dan Mn secara berurutan sebesar 2,28 me/100 g, 5,71 ppm, dan 11,00 ppm. Kandungan unsur logam Fe, Cu, dan Pb meningkat sebesar 17,00 ppm, 1,02 ppm, dan 0,15 ppm., Salam plant (Syzygium polyanthum) can grow in nutrient-poor soils, such as soil contaminated by used oil. The planting of salam with the application of cow manure and husk charcoal is expected to reduce the impact of used oil contaminated. This study aims to analyze the optimal dose to increase the growth of salam to the application of cow manure and husk charcoal on soil contaminated used oil with a concentration of 60 ml/1 kg of soil. The study used a factorial completely randomized design with two factors and a soil analysis test. The result showed that the application of cow manure and its interaction with husk charcoal significantly affected the root shoot ratio (NPA) parameter. The combination of 60 grams of cow manure and 60 grams husk charcoal had the best NPA value of 3,11. The application of cow manure and husk charcoal to soil contaminated by used oil was able to reduce the Al, Zn, and Mn content of 2,28 me/100 g, 5,71 ppm, and 11,00 ppm. The elemental content of Fe, Cu, Pb increased by 17,00 ppm, 1,02 ppm, and 0,15 ppm.
Keyword: cow manure, husk charcoal, root shoot ratio, Syzygium polyanthum, used oil

Judul: Pengaruh Pemberian Pupuk Kandang Kambing dan Arang Sekam terhadap Pertumbuhan Bibit Salam (Syzygium polyanthum (Wight) Walp) pada Media Tercemar Oli Bekas
Abstrak: Oli bekas mengandung kotoran logam, bahan aditif, sisa bahan bakar dan kotoran lain, dalam kadar yang tinggi, apabila limbah oli bekas tumpah di tanah, akan mempengaruhi air tanah dan berbahaya bagi lingkungan. Maka dari itu, perlu dilakukan upaya rehabilitasi lahan yang tercemar oli bekas melalui revegetasi untuk mengurangi kandungan zat B3. Penelitian ini bertujuan menganalisis pengaruh pupuk kandang kambing dan arang sekam terhadap pertumbuhan bibit salam (Syzygium polyanthum) pada media tercemar oli bekas serta menemukan dosis pupuk kandang kambing dan arang sekam. Penelitian ini menggunakan rancangan acak lengkap dengan dua faktor yang terdiri dari pupuk kandang kambing dan arang sekam berbagai dosis. Hasil penelitian menunjukkan bahwa pupuk kandang kambing tunggal memberikan pengaruh nyata terhadap pertumbuhan tinggi, berat basah total, berat kering total, panjang akar dan indeks mutu bibit. Pupuk kandang kambing tunggal dan arang sekam tunggal berpengaruh nyata terhadap respirasi tanah. perlakuan dapat mengurangi kandungan logam berat pada media tercemar oli bekas sebesar 0,3 ppm., Used engine oil contains high levels of metal impurities, additives, residual fuel and other impurities, if the lubricating oil waste is spilled on the ground, it will affect groundwater and be harmful to the environment. Therefore, it is necessary to make efforts to rehabilitate land contaminated with used oil through revegetation to reduce the B3 content of used oil. This study aims to analyze the effect of giving goat manure and husk charcoal on the growth of salam seeds on used oil contaminated media and to find the appropriate dosage of goat manure and husk charcoal. This study used a complete randomized design using goat manure and husk charcoal with various doses. The results showed that the application of single goat manure had a significant effect on height growth, total wet weight, total dry weight, root length and Seed Quality Index. The application of single goat manure and single husk charcoal significantly affected soil respiration. The use of goat manure and husk charcoal can reduce the lead content (Pb) by 0,3ppm.
Keyword: Goat manure, Husk charcoal, Syzygium polyanthum, Used engine oil

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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