Judul: Optimasi Pemanfaatan Vermikompos dari Cacing Tanah  (Lumbricus rubellus) pada Tanaman Bayam Hijau (Amaranthus sp)
Abstrak: Vermikompos merupakan pupuk hasil pengomposan limbah organik dengan bantuan cacing tanah yang mampu menyuburkan tanah. Vermikompos memiliki keunggulan, yaitu bermanfaat bagi pertumbuhan tanaman. Penelitian ini bertujuan mengukur efektifitas level vermikompos dari cacing (Lumbricus rubellus) terhadap tanaman bayam hijau. Rancangan percobaan yang digunakan adalah Rancangan Acak Lengkap (RAL) pola faktorial (4x3). Faktor A adalah level vermikompos (0%, 5%, 10%, 15%) berdasarkan media dan faktor B adalah pupuk anorganik (0%, 50%, 100%) berdasarkan rekomendasi masing-masing dengan 5 kali pengulangan. Kualitas produk vermikompos dari cacing tanah L. rubellus yang berasal dari kotoran sapi sudah memenuhi standart mutu pupuk organik padat. Level optimum untuk pertumbuhan tanaman bayam hijau (Amaranthus sp) adalah kombinasi level pemberian 10% vermikompos dan 50% pupuk anorganik. Penambahan pupuk vermikompos pada media tanaman mampu meningkatkan petumbuhan vegetatif tanaman yang meliputi tinggi tanaman, jumlah daun, luas daun, diameter batang, berat segar tanaman, berat segar akar, dan berat kering tanaman dari tanaman bayam hijau (Amaranthus sp)., Vermicompost is a fertilizer produced by composting organic waste with the help of earthworms that can fertilize the soil. Vermicompost has the measure of being beneficial for plant growth. This study aims to determine the effectiveness of vermicompost levels of worms (Lumbricus rubellus) against green spinach plants. The experimental design used was a completely randomized design (CRD) with a factorial pattern (4x3). Factor A is the level of vermicompost (0%, 5%, 10%, 15%) based on the media and factor B is inorganic fertilizer (0%, 50%, 100%) based on the recommendation each with 5 repetitions. The quality of vermicompost products from the earthworm L. rubellus derived from cow dung has met the quality standards of solid organic fertilizers. The optimum level for the growth of green spinach (Amaranthus sp) is a combination of 10% vermicompost and 50% inorganic fertilizer levels. The addition of vermicompost fertilizer to plant media was able to increase plant vegetative growth which included plant height, number of leaves, leaf area, stem diameter, plant fresh weight, root fresh weight, and plant dry weight of green spinach (Amaranthus sp).
Keyword: Effectiness of Vermicompost, Vermicompost Lumbricus rubellus, Green Spinach (Amaranthus sp)

Judul: Effect of Biogas Waste Sludge Mixed Cow Feces and Odot Grass (Pennisetum purpureum cv. Mott) on Growth and Production of Green Spinach (Amaranthus gangeticus)
Abstrak: Limbah kotoran ternak (feces) bisa dimanfaatkan sebagai pembuatan biogas. Produksi biogas menghasilkan gas dan hasil sampingan yang dapat dijadikan pupuk untuk tanaman. Penelitian bertujuan menganalisis dan mengetahui pengaruh lumpur limbah biogas campuran kotoran sapi dan rumput odot (Pennisetum purpureum cv. Mott) terhadap pertumbuhan dan produksi tanaman bayam hijau (Amaranthus gangeticus). Prosedur yang digunakan yaitu analisis kimia kandungan dalam sludge dan analisis data menggunakan rancangan acak lengkap (RAL) pada uji tanam. Perlakuan pertama merupakan kontrol yaitu 5 kg tanah latosol, perlakuan kedua merupakan campuran 4 kg tanah latosol dan 1 kg sludge, perlakuan ketiga merupakan 4,975 kg tanah latosol dan pupuk NPK (16-16-16) 25 gram. Kombinasi perlakuan terbaik yang diperoleh adalah perlakuan pertama campuran 4 kg tanah latosol dan 1 kg sludge. Perlakuan pupuk organik perlakuan pertama yaitu campuran 4 kg tanah latosol dan 1 kg sludge untuk meningkatkan pertumbuhan vegetatif tanaman yang meliputi tinggi tanaman, jumlah daun, lebar daun, diameter batang, berat segar, berat kering, dan kandungan bahan kering tanaman bayam hijau., Livestock manure (feces) can be used as biogas. Biogas production produces gas and by-products that can be used as fertilizers for plants. The aims of research is to analyze and determine the effect of biogas waste sludge mixed with cow dung and odot grass (Pennisetum purpureum cv. Mott) on the growth and production of green spinach (Amaranthus gangeticus). The procedure used is chemical analysis of the content in the sludge and data analysis using a Completely Randomized Design (CRD) in the planting test. The first treatment was a control, namely 5 kg of latosol soil, the second treatment was a mixture of 4 kg of latosol soil and 1 kg of sludge, the third treatment was 4.975 kg of latosol soil and 25 grams of NPK fertilizer (16-16-16). The best treatment combination obtained was the first treatment with a mixture of 4 kg of latosol soil and 1 kg of sludge. The first treatment of organic fertilizer was a mixture of 4 kg of latosol soil and 1 kg of sludge to increase plant vegetative growth which included plant height, number of leaves, leaf width, stem diameter, fresh weight, dry weight, and dry matter content of green spinach plants.
Keyword: completely randomized design, odot grass, organic fertilizer, sludge

Judul: Asymptotic Distribution of Estimator for the Intensity Function of a Doubly Periodic Poisson Process
Abstrak: In this manuscript, estimation of the intensity function of a doubly periodic Poisson process is discussed. It is assumed that only a single realization of the Poisson process is observed in a bounded window [0,n]. It is also assumed that the period of the intensity function is known. The rate of consistency and asymptotic normality of the estimator are formulated. Finally, a confidence interval for the local intensity function is also formulated.
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