Judul: Pengaruh Kompos Komersial dan Kompos Black Soldier Fly Terhadap Pertumbuhan Bibit Kayu Putih (Melaleuca cajuputi Powell)
Abstrak: Pemanfaatan pupuk kompos Black Soldier Fly berpotensi menjadi alternatif disamping pupuk kompos komersial yang sudah umum dijual. Penelitian ini bertujuan menelaah pengaruh pemberian pupuk kompos BSF terhadap pertumbuhan bibit kayu putih serta perbandingannya dengan pertumbuhan bibit kayu putih yang diberi pupuk kompos komersial. Penelitian ini menggunakan rancangan percobaan jenis Rancangan Acak Lengkap (RAL) satu faktor dengan 5 taraf, yaitu M0 (tanah murni), M1 (tanah dengan pupuk kompos komersial (9:1 berdasarkan volume)), M2 (tanah dengan pupuk kompos BSF (9:1 berdasarkan volume)), M3 (tanah dengan pupuk kompos komersial (4:1 berdasarkan volume)), dan M4 (tanah dengan pupuk kompos BSF (4:1 berdasarkan volume)). Kematian seluruh bibit kayu putih terjadi pada taraf perlakuan M4 yang diduga akibat plasmolisis sel. Hasil analisis data menujukkan perbedaan jenis pupuk kompos berpengaruh nyata terhadap pertumbuhan bibit kayu putih. Pupuk kompos BSF memiliki pengaruh yang sama dengan pupuk kompos komersial pada parameter jumlah daun, diameter, dan berat kering tanaman, sedangkan pupuk kompos komersial memberikan hasil yang lebih baik pada parameter tinggi yang berbanding lurus dengan kekokohan bibit. Pupuk kompos BSF menunjukkan hasil yang tidak berbeda nyata dengan pupuk kompos komersial pada parameter nisbah pucuk akar., The use of Black Soldier Fly compost has the potential to be an alternative to commercial compost that is commonly sold. This study examines the effect of applying BSF compost on the growth of kayu putih seedlings and its comparison with the growth of kayu putih seedlings fed with commercial compost. This study used a one-factor Completely Randomized Design (CRD) with 5 levels, namely M0 (pure soil), M1 (soil with commercial compost (9:1 by volume)), M2 (soil with BSF compost (9:1 by volume)), M3 (soil with commercial compost (4:1 by volume)), and M4 (soil with BSF compost (4:1 by volume)). The death of all kayu putih seedlings occurred at the M4 treatment level, which was thought to be due probably to cell plasmolysis. The results of the data analysis showed that different types of compost had a significant effect on the growth of kayu putih seedlings. BSF compost has the same effect as commercial compost on plants' number of leaves, diameter, and dry weight. In contrast, commercial compost gives better results on the height parameter, which is directly proportional to the sturdiness of the seedlings. BSF compost showed results that were not significantly different from commercial compost in the root shoot ratio parameter.
Keyword: organic fertilizer, plasmolysis, seedling quality, volume comparison

Judul: Morphological Profile and Bioactive Compounds of  Lemongrass (Cymbopogon citratus) with the Application of Black Soldier Fly (Hermetia  illucens) Maggot Biocontrol Fertilizer
Abstrak: Maggot Black Soldier Fly (BSF) sebagai agen biokonversi limbah organik mampu menghasilkan bahan stabil, seperti kompos. Serai dapur merupakan tanaman rempah yang diketahui memiliki banyak manfaat terhadap kesehatan. Penelitian ini bertujuan menganalisis pengaruh aplikasi kompos hasil biokonversi maggot BSF terhadap profil senyawa bioaktif ekstrak etanol tanaman serai dapur. Metode penanaman serai dapur dilakukan di lahan pertanian Desa Sindangjaya yang disusun berdasarkan rancangan kelompok lengkap teracak dengan faktor tunggal. Pengaplikasian pupuk kompos hasil biokonversi maggot BSF pada media tanam serai dapur berpengaruh nyata terhadap pertumbuhan tinggi tanaman (usia 4, 6, 8, 10, 12 MST) dan bobot basah (batang, daun, akar, dan total rumpun). Ekstraksi dilakukan dengan metode maserasi menggunakan pelarut etanol 96% yang selanjutnya diidentifikasi menggunakan instrumen LC-MS/MS. Perbedaan perlakuan aplikasi pupuk memengaruhi komposisi senyawa bioaktif tanaman ini. Secara keseluruhan teridentifikasi sebanyak 48 senyawa yang berhasil teridentifikasi dan pada masing-masing variabel sejumlah 37 senyawa (P1), 30 senyawa (P2), dan 35 senyawa (P3). Senyawa termasuk golongan asam amino, terpenoid, alkaloid, kuinolin, karbohidrat, metoksifenol, benzodioxole, difenilmetana, steroid, dan senyawa golongan lain., Maggot Black Soldier Fly (BSF) as a bioconversion agent of organic waste is able to produce stable materials, such as compost. Lemongrass is a spice plant that known to have many health benefits. This study aims to analyze the effect of the application of BSF maggot bioconverted compost on the profile of bioactive compounds in ethanol extract of lemongrass plants. Lemongrass cultivation method is carried out on the agricultural land of Sindangjaya Village which is prepared based on the randomized complete group design with a single factor. The application of BSF maggot bioconverted compost to the growth medium in lemongrass significantly affected the growth of plant height (age 4, 6, 8, 10, 12 WAP) and wet weight (stems, leaves, roots, and total clumps). Extraction was performed by maceration method using 96% ethanol solvent which further identified using the LC-MS/MS instruments. Overall, 48 compounds were identified and in each variable there are 37 compounds (P1), 30 compounds (P2), and 35 compounds (P3). Compounds are including to the groups of amino acids, terpenoids, alkaloids, quinolines, carbohydrates, methoxyphenol, benzodioxole, diphenylmethane, steroids, and other group compounds.
Keyword: BSF, maggot, profil senyawa, pupuk kompos, serai dapur

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
Keyword: