Judul: Water Footprint Analysis on Melon Cultivation in Greenhouse Using Pocket Fertigation Subsurface Irrigation System
Abstrak: Potensi sumber daya air Indonesia mencapai 3,9 triliun m3/tahun, tetapi sekitar 3,2 triliun m3/tahun belum dimanfaatkan. Ketersediaan air irigasi berpengaruh pada pertumbuhan dan produksi tanaman. Budidaya tanaman melon cukup sulit dikarenakan kecocokan pada kondisi tanah dan udara di lingkungan pertumbuhan tanaman. Salah satu teknik irigasi yang dapat digunakan, yaitu pocket fertigation. Penelitian ini bertujuan menganalisis water footprint tanaman melon dalam greenhouse dengan sistem irigasi pocket fertigation dan konvensional, serta menentukan sistem irigasi paling optimal. Penelitian dilakukan bulan Maret-Juli 2022 di Kinjiro Farm, Kota Bogor. Tahapan penelitian meliputi persiapan lahan, budidaya tanaman melon, pengumpulan data, dan pengolahan data. Rancangan penelitian terdiri dari sistem irigasi pocket fertigation (PF) dan konvensional (SK), serta pemberian air satu kali (E) dan dua kali evaporasi (2E). Sistem irigasi PF-2E menjadi tanaman tertinggi dengan jumlah daun lebih banyak dibandingkan metode lainnya. Sistem irigasi PF-2E lebih efisien untuk diaplikasikan pada tanaman melon, dikarenakan memiliki hasil panen dan produktivitas air yang lebih tinggi, serta water footprint yang lebih rendah dibandingkan metode konvensional., The potential of Indonesia's water resource reaches 3,9 trillion m2/year, but around 3,2 trillion m2/year has not been utilized. Air irrigation affects plant growth and production. Melon plant cultivation is quite difficult because of its suitability to the soil and air conditions in the environment. One of the irrigation techniques is pocket fertigation. This research aims to analyze the water footprint of melon plants in a greenhouse with pocket fertigation and conventional irrigation systems, and determine the most optimal irrigation system. The research was conducted in March-July 2022 at Kinjiro Farm, Bogor City. The research stages include land preparation, melon cultivation, data collection, and processing. The research design consists of pocket fertigation (PF) and conventional irrigation systems (SK), as well as one time (E) and two times evaporations of water (2E). PF-2E irrigation system is the tallest crop with more leaves than other methods. PF-2E irrigation systems are more efficient to be applied to melon plants, because it has higher yields and water productivity, and lower water footprint than conventional methods.
Keyword: evaporation, irrigation, melons, pocket fertigation, water footprint

Judul: Technoeconomic Performance Evaluation of Drip Irrigation System for Melon Crops in IPB Agribusiness and Technology Park
Abstrak: Melon memiliki keistimewaan, baik dari segi rasa, aroma, tekstur, dan kandungan nutrisinya. Hal tersebut mendorong produksi melon pada tahun 2021 dan 2022 menjadi besar sekaligus bukti bahwa melon merupakan salah satu buah yang digemari masyarakat. Penggunaan green house memberikan kemudahan kepada petani dalam mengatur pertumbuhan tanaman dengan irigasi tetes menjadi salah satu metode yang memungkinkan untuk memberikan irigasi. Teknoekonomis dalam penentuan usaha diperlukan agar menilai kelayakan usaha di masa mendatang. Salah satu cara untuk menentukan ekonomis adalah dengan menggunakan benefit cost rasio dan break even point. Selanjutnya penentuan kebutuhan air tanaman sebagai analisis teknisnya. Dalam penentuan teknoekonomis diperlukan data terkait penjualan melon dan suhu rata-rata harian. Penelitian dilakukan dengan mengambil data primer dan sekunder yang berlokasi di Agribusiness and Technology Park Institut Pertanian Bogor. Data primer yang diambil berupa pengukuran debit dan luasan green house. Data sekunder berupa data penjualan melon tahun 2023 dan data suhu harian rata-rata. Dari data primer diperoleh luas green house sebesar 294,38 m2 dan debit pompa 1,18 liter/detik. Dari data sekunder diperoleh besar hasil penjualan melon tahun 2023 sebesar Rp63.239.305 dengan nilai ekonomi sebesar Rp19.835.030. Analisis benefit cost ratio yang dilakukan didapatkan nilai 1,46 yang menunjukkan usaha layak untuk dilanjutkan., Melon production in 2021 and 2022 is expected to be large due to the unique taste, aroma, texture, and nutritional content of melons, which are favored by the public. Greenhouses and drip irrigation are being utilized by farmers to effectively manage plant growth and provide irrigation. Technoeconomic analysis is crucial in determining the feasibility of the melon business for the future. Benefit cost ratio and break even point are used to assess the economics of the business. Additionally, crop water needs are considered in the technical analysis. Primary and secondary data from the Agribusiness and Technology Park at Bogor Agricultural University were used for this research. The primary data included measurements of discharge and green house area, while secondary data included melon sales and average daily temperature. The analysis showed that the business is feasible to continue, with a benefit cost ratio of 1.46 and melon sales in 2023 amounting to Rp63,239,305 with an economic value of Rp19,835,030.
Keyword: melon, ATP IPB, Melon, Technoeconomic, ATP IPB, Drip Irrigation

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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