Judul: Viability of Garlic Seeds (Allium sativum L.) after Hot Water Treatment
Abstrak: Benih bawang putih yang sehat harus bebas nematoda. Penelitian ini dilakukan untuk mempelajari viabilitas benih siung bawang putih akibat perendaman air panas, sehingga diperoleh benih sehat yang bebas nematoda. Penelitian dilaksanakan pada bulan September-Desember 2021 di lahan masyarakat di Kota Depok. Penelitian ini dilakukan dengan Rancangan Acak Kelompok faktorial 2 faktor, yaitu faktor suhu dan faktor lama perendaman. Taraf perlakuan suhu air panas adalah suhu ruang (27℃) sebagai kontrol, 50℃, 55℃, dan 60°C. Taraf perlakuan lama perendaman adalah pencelupan sesaat selama 3 detik sebagai kontrol, 20 menit, 25 menit, dan 30 menit. Hasil penelitian menunjukkan bahwa perlakuan suhu ruang dan 50℃ pada semua taraf lama perendaman dapat menghasilkan persentase yang tinggi pada tolok ukur benih segar dan potensi tumbuh maksimum. Perendaman air panas pada suhu ruang dan 50℃ menunjukkan tinggi tanaman, jumlah daun, dan persentase daya tumbuh benih yang lebih tinggi dibandingkan perlakuan lainnya. Benih siung bawang putih yang sehat diperoleh dari perlakuan air panas pada suhu 50℃ selama 20 menit sampai 30 menit., Healthy garlic seeds should be nematode-free. This research was conducted to study the viability of garlic clove seeds due to hot water immersion, to obtain healthy seeds free of nematodes. The research was carried out in September-December 2021 on community land in Depok City. This research was conducted in a factorial randomized block design with 2 factors, namely the temperature factor and the immersion time factor. The treatment level of hot water temperature is room temperature (27℃) as control, 50℃, 55℃, and 60°C. The treatment level of immersion time was immersion for 3 seconds as control, 20 minutes, 25 minutes, and 30 minutes. The results showed that the treatment at room temperature and 50℃ at all levels of immersion time could produce a high percentage of fresh seed benchmarks and maximum growth potential. Hot water immersion at room temperature and 50℃ showed higher plant height, number of leaves, and percentage of seed germination compared to other treatments. Healthy garlic clove seeds were obtained from hot water treatment at 50℃ for 20 minutes to 30 minutes.
Keyword: garlic, hot water, immersion, seeds, temperature

Judul: Penyimpanan Bibit Bawang Merah (Allium ascalonicum L.) pada Suhu Rendah dan Perlakuan Kadar Air Awal Untuk Mempertahankan Mutu
Abstrak: Bad post-harvest handling cause shallot damage and sprouting before the right time. Therefore the study of interaction initial moisture content and low temperature treatment is needed. The purpose of this research are to testing the effect of moisture content and low temperature of the damage and sprouting, and to knowing optimum moisture content and temperature to reduce the damage and sprouting. Methods of this research using some levels moisture content, there are ±85%, ±83%, dan ±81%, and then shallot seed stored at temperature 5°C and room temperature during 8 weeks. The result showed that interaction of moisture content and temperature had not significant effect on the sprouting, but significant effect on the damage. Optimum moisture content in the range of 80-85% can hold percentage of sprouting, but it cannot hold damage percentage. Percentage of damage is 19.8%. Temperature 5°C is the most optimal to reduce damage percentage, but the highest percentage of sprouting occurred at temperature 5°C. Percentage of sprouting is 4.8%.
Keyword: Bogor Agricultural University (IPB), shallot seed., moisture content, damage

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.
Keyword: