Judul: Responses in Growth and Production of Shallot (Allium cepa L.) on the  Application of Soil Ameliorant
Abstrak: Bawang merah merupakan salah satu komoditas pangan utama dan strategis yang produksi dan produktivitasnya sering tidak stabil. Salah satu upaya meningkatkan produktivitas bawang merah (Allium cepa L.) dengan memperbaiki kualitas kesuburan tanah dengan menambahkan pembenah tanah. Tujuan penelitian ini mengetahui pengaruh aplikasi bahan pembenah tanah ZeomicAgro dan Zeagro terhadap sifat kimia tanah, pertumbuhan, dan produksi tanaman bawang merah (Allium cepa L.). Penelitian dilakukan menggunakan rancangan acak kelompok (RAK) dengan empat perlakuan dan tiga ulangan. Perlakuan meliputi K0 = kontrol; ST (standar) = ZA 300 kg/ha, KCl 200 kg/ha, Urea 200 kg/ha, SP-36 200 kg/ha; P1 = Zeagro 200 kg/ha, ZA 200 kg/ha, KCl 150 kg/ha, Urea 150 kg/ha, SP-36 150 kg/ha; P2 = ZeomicAgro 200 kg/ha, ZA 200 kg/ha, KCl 150 kg/ha, Urea 150 kg/ha, SP-36 150 kg/ha. Zeagro merupakan pembenah tanah yang terbuat dari zeolit dan kapur sedangkan ZeomicAgro terbuat dari zeolit, kapur, dan bahan humat. Analisis sifat kimia tanah dilakukan pada tanah awal dan setelah panen pada 12 minggu setelah tanam (MST). Hasil analisis tanah menunjukkan bahwa pada perlakuan ZeomicAgro (P2) nyata meningkatkan N-total dan kejenuhan basa (KB), serta cenderung meningkatkan C-organik, P-tersedia, basa-basa dapat dipertukarkan, dan KTK dibandingkan standar dan perlakuan Zeagro. Perlakuan ZeomicAgro (P2) nyata meningkatkan tinggi tanaman, bobot basah, bobot kering, dan produktivitas dibandingkan standar dan Zeagro. Produktivitas tertinggi dicapai pada 6.79 ton/ha. Perlakuan ZeomicAgro dapat mengefisienkan penggunaan pupuk Urea, KCl, dan SP-36 hingga 25% dan pupuk ZA hingga 30% dari dosis standar., Shallots are one of the main and strategic food commodities whose production and productivity are often unstable. One of the efforts to increase the productivity of shallots (Allium cepa L.) by improving the quality of soil fertility by adding soil ameliorant. The purpose of this study is to determine the influence of the application of ZeomicAgro and Zeagro soil ameliorant agents on soil chemistry, growth, and production of shallot plants (Allium cepa L.). The research was conducted using a group random design (RAK) with four treatments and three repetitions. Treatment includes K0 = control; ST (standard) = ZA 300 kg/ha, KCl 200 kg/ha, Urea 200 kg/ha, SP-36 200 kg/ha; P1 = Zeagro 200 kg/ha, ZA 200 kg/ha, KCl 150 kg/ha, Urea 150 kg/ha, SP-36 150 kg/ha; P2 = ZeomicAgro 200 kg/ha, ZA 200 kg/ha, KCl 150 kg/ha, Urea 150 kg/ha, SP-36 150 kg/ha. Zeagro is a soil ameliorant made of zeolite and lime while ZeomicAgro is made of zeolite, lime, and humic acid. Analysis of soil chemical properties was carried out on the initial soil and after harvest at 12 week after planting. The results of soil analysis showed that in the ZeomicAgro (P2) treatment, it significantly increased total nitrogen and base saturation, tended to increase organic carbon, available phosphorus, exchangeable bases, and cation exchange capacity (CEC) compared to standard and Zeagro treatment. ZeomicAgro (P2) treatment significantly increased crop height, wet weight, dry weight, and productivity compered to standard and Zeagro treatment. The highest productivity was achieved at 6.79 tons/ha. ZeomicAgro treatment can increase the use of Urea, potassium chloride (KCl), and super phosphate-36 (SP-36) fertilizers up to 25% and fertilizer zwavelzure amonium (ZA)
Keyword: Humatic Substances, Lime, Soil Ameliorant, Zeolite, Shallots

Judul: The Effect of ZeomicAgro Soil Ameliorant on the Productivity of Rice on Sawah Baru Experimental Field Dramaga
Abstrak: Perbaikan kesuburan tanah dan peningkatan efisiensi penggunaan pupuk anorganik penting diupayakan dalam meningkatkan produktivitas pertanian, antara lain dengan penambahan bahan pembenah tanah. Salah satu pembenah tanah adalah ZeomicAgro yang berbahan dasar zeolit, bahan humat, dan kapur. Tujuan dari penelitian ini untuk mengetahui pengaruh pemberian ZeomicAgro terhadap sifat kimia tanah, pertumbuhan dan produktivitas padi. Penelitian dilakukan di Kebun Percobaan Sawah Baru, dengan jenis tanah Latosol, dan menggunakan benih padi IPB 3S. Penelitian dilakukan menggunakan rancangan acak lengkap (RAL) non faktorial dengan lima perlakuan dan empat ulangan. Perlakuan merupakan kombinasi dosis ZeomicAgro dan pemupukan, dengan P1 (kontrol, tanpa ZeomicAgro dan tanpa pupuk), P2 (pemupukan standar, tanpa ZeomicAgro, Urea 200 kg/ha, SP-36 100 kg/ha, dan KCl 100 kg/ha), P3 (ZeomicAgro 100 kg/ha, Urea 100 kg/ha, SP-36 75 kg/ha, dan KCl 75 kg/ha), P4 (ZeomicAgro 200 kg/ha, Urea 100 kg/ha, SP-36 75 kg/ha, dan KCl 75 kg/ha), P5 (ZeomicAgro 300 kg/ha, Urea 100 kg/ha, SP-36 75 kg/ha, dan KCl 75 kg/ha). Hasil penelitian menunjukkan bahwa perlakuan ZeomicAgro dosis 200 kg/ha nyata meningkatkan kadar Corganik, NO3 - , P-tersedia dan K-dd, serta cenderung meningkatkan N-total dan KTK. Pemberian ZeomicAgro berpengaruh nyata terhadap tinggi tanaman dan jumlah anakan pada umur tanaman 9 MST, serta meningkatkan jumlah anakan produktif. Perlakuan ZeomicAgro dengan dosis 200 kg/ha dapat mengurangi dosis pemupukan urea hingga 50 %, pupuk SP36 dan KCl hingga 25%, dengan tingkat produktivitas tidak berbeda nyata dengan perlakuan standar., Improving soil fertility and increasing the efficiency of using inorganic fertilizers are important efforts to increase agricultural productivity, including by adding soil ameliorant. One soil ameliorant is ZeomicAgro which is made from zeolite, humic substance and lime. The aim of this research is to determine the effect of ZeomicAgro on the growth and productivity of rice. The research was carried out at the Sawah Baru, IPB Experimental Field, with Latosols soil type, and using IPB 3S rice seeds. The research was conducted using a non-factorial completely randomized design (CRD) with five treatments and four replications. The treatment was a combination of ZeomicAgro doses and fertilization, with P1 (as a control, without ZeomicAgro and fertilizer), P2 (standard fertilization, without ZeomicAgro, Urea 200 kg/ha, SP-36 100 kg/ha, and KCl 100 kg/ha), P3 (ZeomicAgro 100 kg/ha, Urea 100 kg/ha, SP-36 75 kg/ha, and KCl 75 kg/ha), P4 (ZeomicAgro 200 kg/ha, Urea 100 kg/ha, SP-36 75 kg/ ha, and KCl 75 kg/ha), P5 (ZeomicAgro 300 kg/ha, Urea 100 kg/ha, SP-36 75 kg/ha, and KCl 75 kg/ha). The results showed that ZeomicAgro treatment with a dose of 200 kg/ha (P4) significantly increased levels of organic-C, NO3 - , available-P and exchangeable-K, and tended to increase totalN and CEC. The application of ZeomicAgro had a significant effect on plant height and number of tillers at 9 WAP, as well as increasing the number of productive tillers. ZeomicAgro treatment with a dose of 200 kg/ha can reduce the doses of urea fertilizer by up to 50%, SP36 and KCl fertilizer by up to 25%, with productivity levels not significantly different from standard treatment.
Keyword: Bahan Humat, Efisiensi pemupukan, latosol, Zeolit, IPB 3S, Fertilizer efficiency, humic substance, IPB 3S, Latosols, zeolite

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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