Judul: Coffee Ground and Husk as Components of Growing Media for the Production of White Oyster Mushroom (Pleurotus ostreatus)
Abstrak: Jamur tiram memiliki nilai ekonomi, ekologi, dan kesehatan serta dibudidayakan dengan media serbuk kayu dengan campuran dedak. Namun, pemanfaatan dedak bersaing dengan kebutuhan lain, seperti pakan. Padahal, limbah industri kopi banyak tersedia. Oleh sebab itu, penelitian ini bertujuan untuk mengetahui potensi ampas dan kulit kopi sebagai komponen media jamur tiram putih pengganti dedak. Penelitian dilakukan pada dua konsentrasi ampas dan kulit kopi (9% dan 18%), sehingga terdapat empat perlakuan: ampas kopi 9% (A1), ampas kopi 18% (A2), kulit kopi 9% (K1), dan kulit kopi 18% (K2). Media perlakuan ditambah serbuk gergaji 80%, kapur 2%, dan dedak 9% atau 0%. Media kontrol (K) memiliki dedak 18%. Jamur dipanen hingga tiga kali. Setiap perlakuan memiliki rasio C/N dan produksi yang berbeda. Media dengan rasio C/N tertinggi adalah K2, diikuti berturut-turut oleh A2, K1, A1, dan K. Media dengan rasio C/N yang lebih tinggi menunjukkan periode inkubasi yang lebih pendek, kecuali pada K1 dan K2. Sebaliknya, media dengan rasio C/N yang lebih rendah menunjukkan bobot panen total, bobot tubuh buah, jumlah tubuh buah dan primordium (kecuali pada K1), dan nilai efisiensi biologi (EB) yang lebih tinggi. Perlakuan A1 memiliki nilai keberterimaan yang baik dan EB 42.11%, sehingga ampas kopi 9% dapat menjadi alternatif pengganti dedak., Oyster mushrooms have economic, ecological, and health values and are cultivated with sawdust media with a mixture of rice bran. However, the use of rice bran competes with other needs, such as feed. Meanwhile, coffee industry waste is widely available. Therefore, this study aims to determine the potential of coffee grounds and skins as components of white oyster mushroom media to replace rice bran. The study was conducted at two concentrations of coffee grounds and husks (9% and 18%), so that there were four treatments: 9% coffee grounds (A1), 18% coffee grounds (A2), 9% coffee husks (K1), and 18% coffee husks (K2). Added with 80% sawdust, 2% lime, and 9% or 0% rice bran. The control medium (K) had 18% bran. Mushrooms are harvested up to three times. Each treatment has a different C/N ratio and production. The medium with the highest C/N ratio was K2, followed by A2, K1, A1, and K, respectively. The medium with the higher C/N ratio showed a shorter incubation period, except for K1 and K2. On the other hand, media with a lower C/N ratio showed higher total harvest weight, fruiting body weight, number of fruiting bodies and primordium (except for K1), and higher biological efficiency (EB) values. The A1 treatment had a good acceptability value and an EB of 42.11%, 9% coffee grounds could be an alternative to rice bran.
Keyword: antinutrition, biological efficiency, C/N ratio, utilization

Judul: Pengaruh Serbuk Sengon, Daun Jati, dan Tandan Kosong Kelapa Sawit (TKKS) terhadap Kultivasi Jamur Tiram (Pleurotus spp.)
Abstrak: Jamur tiram (Pleurotus spp.) merupakan salah satu jenis jamur kayu yang banyak dikonsumsi masyarakat karena memiliki kandungan gizi yang tinggi. Limbah serbuk sengon, kelapa sawit dan serasah daun jati menjadi alternatif sebagai media tanam dalam kultivasi jamur tiram. Penelitian ini bertujuan mempelajari pertumbuhan dan produksi jamur tiram (Pleurotus spp.) pada media yang mengandung serbuk sengon, daun jati, dan Tandan Kosong Kelapa Sawit (TKKS). Metode yang digunakan adalah Rancangan Acak Lengkap Faktorial (RALF). Faktor pertama terdiri atas jamur tiram cokelat dan merah, faktor kedua terdiri atas 6 komposisi media. Hasil penelitian menunjukkan formula 2 (serbuk sengon 1860 g + daun jati 300 g) memberikan pengaruh terbaik pada fase vegetatif dengan rata-rata pertumbuhan miselium 0,75 cm/hari. Fase generatif paling baik dalam 2 kali panen diperoleh formula 4 (serbuk sengon dengan TKKS 1:2) yaitu 9 hari. Total bobot basah tertinggi diperoleh formula 4 yaitu 103,39 g dengan nilai efisiensi biologis 53,28%. Hama dan penyakit yang ditemukan adalah tungau, Collembola, dan Trichoderma sp. Kata kunci: budi daya, limbah, media, pertumbuhan, produktivitas ABSTRACT RIZAL LUL GODI. Effect of Sengon Powder, Teak Leaves, and Empty Bunches of Oil Palm (EBOP) on Cultivation Oyster Mushroom (Pleurotus spp.). Supervised by ELIS NINA HERLIYANA and LUFTHI RUSNIARSYAH. Oyster mushroom (Pleurotus spp.) is a type of wood mushroom that is widely consumed by the public because it has a high nutritional content. Waste of sengon powder, oil palm and teak leaf litter is an alternative as a growing medium in the cultivation of oyster mushrooms. This study aims to study the growth and production of oyster mushrooms (Pleurotus spp.) on media containing sengon powder, teak leaves, and Empty Bunches of Oil Palm (EBOP). The method used is the Factorial Complete Randomized Design (FCRD). The first factor consists of brown and red oyster mushrooms, the second factor consists of 6 media compositions. The results showed that formula 2 media (sengon powder 1860 g + teak leaves 300 g) had the best influence with an average growth of mycelium of 0,75 cm/day. The generative phase that requires the shortest harvest period in formula 4 media (sengon powder with EOPB 1:2) is 9 days. The highest total wet weight of the fungus was obtained in formula 4 media, which was 103,39 g with a biological efficiency value of 53,28%. Pests and diseases found are mites, Collembola, and Trichoderma sp. Keywords: cultivation, growth, media, productivity, waste
Keyword: ultivation, growth, media, productivity, waste

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
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