Judul: Aplikasi Micro-fertilizers Kitosan-AA-NPK untuk Perkecambahan Jelutung Rawa (Dyera polyphylla) dan Padi (Oryza sativa).
Abstrak: Rehabilitation is important to recover degraded tropical peatlands in Indonesia. Enrichment planting by prioritizing native species, such as swamp jelutung and paddy Inpara-2, also fertilizers applications could accelerate rehabilitation. This research aims to formulate the chitosan-AA-NPK micro-fertilizers, as well as analyze their effect on swamp jelutung (Dyera polyphylla) and paddy Inpara-2 (Oryza sativa) germination. The experimental design used a completely randomized design with a factor (micro-fertilizers), 18 levels, and four replications at each species. The chitosan-AA-NPK micro-fertilizers enhanced germination and significantly affected all parameters, except mean germination time (MGT) in D. polyphylla and maximum growth potential (MGP) in O. sativa. The activated micro-carbon (AC) 3% increased the germination percentage (GP), MGP, seedling survival rate (SSR), and decreased MGT of D. polyphylla. The micro-lignocellulose (LC) 1% resulted in the highest GP, MGP, lowest abnormal seedlings (AS), and MGT of O. sativa. Application of the AC 3% treatment resulted in the best growth of D. polyphylla, while the LC 1% treatment resulted in the best growth of O. sativa., Rehabilitasi merupakan upaya penting untuk memulihkan lahan gambut terdegradasi di Indonesia. Penanaman pengayaan dengan mengutamakan spesies asli seperti jelutung rawa dan padi Inpara-2, serta pemberian pupuk dapat mempercepat proses rehabilitasi. Penelitian ini bertujuan memformulasikan micro-fertilizers kitosan-AA-NPK dan menganalisis pengaruhnya terhadap perkecambahan jelutung rawa (Dyera polyphylla) dan padi (Oryza sativa). Percobaan menggunakan Rancangan Acak Lengkap dengan satu faktor (micro-fertilizers), 18 taraf dan 4 ulangan pada setiap spesies. Micro-fertilizers kitosan-AA-NPK berpengaruh signifikan pada semua parameter, kecuali laju perkecambahan (MGT) pada D. polyphylla dan potensi tumbuh maksimum (MGP) pada O. sativa. Aplikasi Mikrokarbon teraktivasi (AC) 3% menghasilkan pertumbuhan terbaik pada D. polyphylla dan Mikro-lignoselulosa (LC) 1% menghasilkan pertumbuhan terbaik pada O. sativa.
Keyword: activated carbon, inpara-2 variety, lignocellulose, oil palm waste, rehabilitation

Judul: Application of Microfertilizers for the Growth of Swamp Jelutong (Dyera polyphylla (Miq.) Steenis) and Rice (Oryza Sativa L.) on Peat Soil
Abstrak: Degradasi dan deforestasi lahan gambut memerlukan rehabilitasi melalui penanaman spesies adaptif dan aplikasi pupuk. Jelutung rawa (Dyera polyphylla) dan padi varietas Inpara-2 (Oryza sativa) merupakan tanaman adaptif di lahan gambut yang dapat digunakan dalam rehabilitasi. Microfertilizers berbasis limbah kelapa sawit memiliki potensi untuk memperbaiki unsur hara tanah. Tujuan dari penelitian ini adalah i) membuat formula microfertilizers berbasis limbah kelapa sawit, ii) menganalisis aplikasi microfertilizers terhadap unsur hara tanah gambut, dan iii) menganalisis aplikasi pupuk mikro terhadap pertumbuhan tanaman jelutung rawa dan padi di tanah gambut. Rancangan percobaan menggunakan Rancangan Acak Lengkap (RAL) dengan 1 faktor dan 3 ulangan. Faktor tersebut adalah jenis pupuk mikro yang terdiri dari mikro karbon teraktivasi (MT), mikro karbon tidak teraktivasi (MNT), mikro lignoselulosa (ML), mikro selulosa kristal (MK) dengan konsentrasi 1%, 3%, 5%, dan 7%. Terjadi peningkatan pH tanah gambut (pH 7,70- 7,80) dan kandungan NPK. Pemberian 7% MT menghasilkan pertumbuhan terbaik pada jelutung rawa, sedangkan pemberian 3% MNT menghasilkan pertumbuhan terbaik pada padi., Peatland degradation and deforestation require rehabilitation through adaptive species planting and fertilizer application. Swamp jelutung (Dyera polyphylla) and Inpara-2 variety paddy (Oryza sativa) are adaptive plants in the peatland that can be used in rehabilitation. Oil palm waste-based microfertilizers have the potency to improve soil nutrients. The objectives of this research were i) to make a formula for oil palm waste-based microfertilizers, ii) to analyze the application of microfertilizers to the peat soil nutrition, and iii) to analyze the application of microfertilizers to the growth of swamp jelutung and paddy in peat soil. The experimental design used a completely randomized design (CRD) with 1 factor and 3 replications. The factor was the type of microfertilizers consisted of activated micro-carbon (MT), non-activated micro-carbon (MNT), microlignocellulose (ML), Micro-crystalline cellulose (MK) with concentrations of 1%, 3%, 5%, and 7%. There was an increase in the pH of the peat soil (pH 7,70-7,80) and NPK content. The 7% MT resulted in the best growth in Swamp jelutung while 3% MNT resulted in the best growth in paddy.
Keyword: adaptive species, oil palm waste, peat, survival rate

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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