Judul: Kinerja Irigasi Tetes pada Pembibitan Kopi Arabika
Abstrak: Irigasi tetes merupakan salah satu irigasi yang banyak digunakan pada pertanian karena air yang disalurkan pada irigasi ini langsung mengarah ke area perakaran tanaman atau permukaan tanah. Penelitian bertujuan menganalisis kinerja irigasi tetes dan membandingkan dengan kinerja penyiraman konvensional menggunakan gembor. Terdapat 12 perlakuan yang diterapkan yaitu kombinasi dua perlakuan irigasi (irigasi tetes dan penyiraman menggunakan gembor), dua perlakuan air untuk irigasi (air saja serta campuran air dan nutrisi), dan tiga komposisi media tanam (tanah, campuran tanah dan sekam, serta campuran tanah, sekam, dan pupuk kandang). Hasil penelitian menunjukkan perlakuan irigasi tetes (air dan nutrisi) menghasilkan pertumbuhan bibit kopi paling baik diantara perlakuan lainnya. Irigasi tetes memiliki debit air sebesar 0,534 liter/menit dengan persentase nilai efisiensi pemakaian air sebesar 75,15%. Perlakuan irigasi tetes (air dan nutrisi) pada media tanam tanah, campuran tanah dan sekam, serta campuran tanah, sekam, dan pupuk kandang berurutan memiliki pertambahan tinggi tanaman sebesar 2,93 cm, 2,53 cm, dan 1,60 cm, pertambahan diameter batang sebesar 0,64 mm, 0,49 mm, dan 0,42 mm, serta jumlah daun sebanyak 11,33 helai, 12 helai, dan 8,67 helai. Komposisi media tanam yang lebih lengkap memiliki pertumbuhan lebih rendah karena memiliki nilai derajat keasaman (pH) media tanam yang lebih rendah dimana nilai pH media tanam tanah sebesar 5,42, nilai pH media tanam campuran tanah dan sekam sebesar 5,03, dan nilai pH media tanam campuran tanah, sekam, dan pupuk kandang sebesar 4,56. Biaya produksi per bibit pada perlakuan irigasi tetes sebesar Rp6.450,06/bibit hingga Rp7.119,14/bibit. Biaya produksi per bibit pada perlakuan penyiraman menggunakan gembor sebesar Rp3.873,13/bibit hingga Rp4.645,20/bibit., Drip irrigation is one of the most widely used irrigation methods in agriculture because the water channeled in this irrigation goes directly to the plant root area or soil surface. The study aimed to analyze the performance of drip irrigation and compare it with the performance of conventional watering using a watering can. There were 12 treatments applied, namely a combination of four watering treatments (drip irrigation (water), drip irrigation (water and nutrients), watering using a paddle (water), and watering using a paddle (water and nutrients)) and three compositions of planting media (soil, a mixture of soil and husks, and a mixture of soil, husks, and manure). The results showed that the drip irrigation treatment (water and nutrients) produced the best growth of coffee seedlings among other treatments. Drip irrigation has a water discharge of 0.534 liters/minute with a percentage of water use efficiency value of 75.15%. Drip irrigation treatment (water and nutrients) on soil, soil and husk mixture, as well as soil, husk, and manure mixture sequentially had plant height increase of 2.93 cm, 2.53 cm, and 1.60 cm, stem diameter increase of 0.64 mm, 0.49 mm, and 0.42 mm, as well as the number of leaves of 11.33 strands, 12 strands, and 8.67 strands. The composition of the more complete planting media has lower growth because it has a lower acidity (pH) value of the planting media where the pH value of the soil planting media is 5.42, the pH value of the soil and husk mixture planting media is 5.03, and the pH value of the
Keyword: coffee nursery, drip irrigation, nutrition, growing media, cost analysis

Judul: The Growth Responses of Organic Arabica Coffee  Seedlings (Coffea arabica) Towards Several Doses of Chicken Manure
Abstrak: Kopi merupakan salah satu komoditas perkebunan unggulan. Menurut BPS (2021), produksi total kopi nasional pada tahun 2021 berada pada angka 786,19 ribu ton dengan PR sebagai produsen terbesar, yaitu berkisar 780,9 ribu ton (99,32%) diikuti oleh PBN sebesar 4,13 ribu ton (0,53%) dan PBS 1,2 ribu ton (0,15%). Terdapat permasalahan yang terjadi pada budidaya tanaman kopi, di antaranya adalah perubahan iklim global, penggunaan bahan tanaman dengan kualitas yang kurang baik, dan kenaikan harga pupuk NPK. Upaya yang dapat dilakukan untuk meningkatkan produktivitas kopi adalah menyiapkan bibit yang berkualitas baik dan pemberian pupuk. Penelitian ini bertujuan mendapatkan dosis pupuk kandang ayam yang terbaik untuk pertumbuhan bibit kopi Arabika organik. Penelitian dilaksanakan pada April hingga Agustus 2023 di Kebun Percobaan Leuwikopo, Institut Pertanian Bogor. Penelitian dirancang dengan rancangan kelompok lengkap teracak (RKLT) dengan taraf perlakuan berupa pemberian pupuk kandang dengan dosis 0 gram/tanaman atau kontrol (P0), 300 gram/tanaman (P1), 400 gram/tanaman (P2), 500 gram/tanaman (P3), 600 gram/tanaman (P4), dan 700 gram/tanaman (P5). Hasil penelitian menunjukkan bahwa pemberian pupuk kandang dengan beberapa dosis berpengaruh nyata terhadap tinggi tanaman, diameter batang, bobot basah tajuk, bobot kering tajuk, dan nisbah tajuk-akar. Dosis pupuk 300 gram/tanaman memberikan pengaruh terbaik terhadap pertumbuhan bibit kopi Arabika. Analisis hara tanah setelah perlakuan pemupukan menghasikan peningkatan nilai pada parameter pH, C organik, dan N-total. Sampel tanah menunjukkan terjadinya perbaikan kualitas tanah dari segi kimia dan fisiknya. Dosis optimum pupuk kandang ayam untuk pertumbuhan bibit kopi Arabika adalah 455 gram/tanaman., Coffee is one of the prime plantation commodities. According to BPS (2021), the total of national coffee production in 2021 is 786,19 thousand tonnes with PR as the largest producer, namely around 780,9 thousand tonnes (99,32%) followed by PBN at 4,13 thousand tonnes (0,53%) and PBS 1,2 thousand tonnes (0,15%). There are some problems that occurs in coffee cultivation, including global climate changes, the use of poor quality plant materials, and the increase in the price of NPK fertilizer. Efforts that can be made to increase coffee productivity are preparing the good quality of seedlings and applying fertilizer. This research aims to obtain the best dose of chicken manure for the growth of organic Arabica coffee seedlings. The research was carried out from April to August 2023 at the Leuwikopo Experimental Garden, Institut Pertanian Bogor. The research was designed using a randomized complete group design (RKLT) that consisted the application of several doses of chicken manure. Those levels were the application of chicken manure with doses of 0 gram/plant or control (P0), 300 gram/plant (P1), 400 gram/plant (P2), 500 gram/plant (P3), 600 gram/plant (P4), and 700 gram/plant (P5). The results of the research showed that applying several doses of chicken manure had a significant effect on plant height, stem diameter, wet weight of seedling canopies, dry weight of seedling canopies, and shoot-root ratios. Chicken manure dose of 300 gram/plant has the best effect on the growth of Arabica coffee seedlings. Soil nutrient analysis after fertilization treatment resulted in increased values for the pH, C-organic and N-total. Soil samples showed improvements in soil quality in terms of chemistry and physicality. The optimum dose of
Keyword: Arabica coffee, chicken manure, seedling growth

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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