Judul: Viabilitas dan Daya Simpan Benih Lobak (Raphanus sativus L.) Lokal dan Impor Setelah Disimpan pada Ruang Simpan Berbeda
Abstrak: The objective of this research was to study the viability local and imported radish seed after storage period and different room storage condition. This research was conducted at IPB Seed Science and Technology Laboratory for five months. This research used completely randomized design with two factors. The first factor is storage period consisting of 0, 2, 4, 6, 8, 10 and 12 weeks, and the second factor is the room storage condition, such as the room (27-30.7 oC) and the AC (18.7-27.9 oC) with four replicates, used local and imported radish seed. The results showed that local and imported radish seed still have a high viability after 12 weeks storage period, and the both of seeds could be stored in room or AC condition depend on the available of own room to maintain the viability still high during storage period. First and final count of the germination test should be performed on days 3 and 5.
Keyword: storage period, seed viability test, local seed, imported seeds

Judul: Pengaruh Kadar Air dan Kondisi Ruang Simpan Benih terhadap Viabilitas Benih Bengkuang (Pachyrrhizus erosuz L.)
Abstrak: Pengadaan benih bengkuang dengan jumlah memadai dan tepat menjadi kendala karena daya simpan benih yang rendah. Penurunan viabilitas benih dapat dikendalikan dengan menurunkan kadar air dan mengatur kondisi ruang simpan sehingga benih dapat disimpan dalam waktu yang lama. Penelitian ini bertujuan mempelajari pengaruh kadar air awal dan kondisi penyimpanan terhadap viabilitas benih bengkuang (Pachyrrhizus erosus L.). Penelitian dilaksanakan mulai bulan Desember 2018 sampai Juli 2019 di Laboratorium Pengujian dan Penyimpanan Benih, Departemen Agronomi dan Hortikultura, Institut Pertanian Bogor. Penelitian menggunakan Rancangan Kelompok Lengkap Teracak dua faktor, pertama kondisi ruang simpan yang terdiri dari ruang kamar (RH 61-80.2%, 28.2-30.6 ºC) dan ruang AC (RH 54-65%, 18-18.9 ºC), faktor kedua yaitu kadar air awal yang terdiri dari 10% dan 12%. Hasil penelitian menunjukkan kadar air awal benih bengkuang yang aman untuk penyimpanan selama 6 bulan berkisar antara 10% hingga 12%. Kadar air awal benih mempengaruhi tingkat kebocoran membran pada benih yang disimpan pada kondisi ruang kamar berdasarkan tolok ukur daya hantar listrik. Penyimpanan benih pada kondisi ruang AC selama 6 bulan mampu mempertahankan viabilitas potensial lebih baik dibandingkan kondisi ruang kamar berdasarkan tolok ukur daya berkecambah.
Keyword: daya berkecambah, daya hantar listrik, kadar air awal, kebocoran membran

Judul: : Persamaan Tunggal sebagai Representasi Kurva Komposit
Abstrak: A mathematical method is introduced to represent a composite curve based on an extension of analytic geometry. The representation is given either with a single equation or with two equations, in the case of parametric representation. This method permits the representation of composite curves in similar manner to the conventional representation of non-composite curves. Some mathematical tools, including Heaviside unit step function and periodizer function, are used in the establishment of a single equation. In this paper, regular equations of regular and irregular polygon, as well as composite curves of two dimensions, are implemented using a computer algebraic system, Mathematica.
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