Judul: Studi Rasio Campuran Benih Kedelai yang Optimal dalam Rangka Pemanfaatan Benih Kadaluarsa
Abstrak: Percobaan ini bertujuan untuk mempelajari kemungkinan benili yang masih memiliki kemampuan pulih vigor untuk dicampur dengan benih berviabilitas tinggi dan mengetahui rasio campuran benih kedelai yang optimal. Percobaan dilaksanakan di Laboratorium Ilmu dan Teknologi Benih Leuwikopo Darmaga Institut Pertanian Bogor. Percobaan dilakukan dari bulan Mei sampai bulan September 1999.
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Judul: Mempelajari karakteristik penjemuran brangkasan dan benih kedelai
Abstrak: Kedelai (Glycine max L. Merril) merupakan tanaman palawija yang penting di Indonesia. Produksi kedelai terus meningkat dari 769,4 ribu ton pada tahun 1984 menjadi I, 72 juta ton pada tahun 1992. Peningkatan produksi kedelai tidak dapat lepas dari penyediaan benih bermutu. Untuk memperolah benih kedelai yang bermutu diperlukan rantai proses penanganan yang salah satunya adalah proses pengeringan. Di Indonesia penjemuran merupakan cara yang umum digunakan petani untuk mengeringkan benih. Penelitian tentang penjemuran benih yang dilakukan di Indonesia masih terbatas. Tujuan penelitian ini adalah: 1). mempelajari keragaan dan karakteristik beberapa cara penjemuran brangkasan dan benih kedelai 2). mengembangkan cara pengeringan brangkasan dan benih kedelai yang dapat disarankan di tingkat petani dengan viabilitas yang tinggi. Percobaan terdiri dari dua tahap yaitu evaluasi penjemuran brangkasan kedelai dengan menggunakan rak dan evaluasi beberapa cara penjemuran benih kedelai . Pada percobaan pertama perlakuan yang diberikan adalah penggunaan berbagai berat ikatan brangkasan 0,5 kg, I kg, 1,5 kg, 2 kg. Sebagai pembanding digunakan penjemuran hamparan (penjemuran dengan cara dihampar) di atas alas plastik dengan tebal hamparan 25 cm. Sedangkan pada percobaan kedua perlakuan yang diberikan adalah ketinggian alas penjemur yaitu 0 cm, dan 90 cm serta ketebalan hamparan benih kedelai, yaitu I cm, 3 cm, 5 cm, 7 cm. Pengamatan dilakukan terhadap kapasitas penjemuran, laju pengeringan, efisiensi pengeringan dan mutu benih yang dihasilkan setelah pengeringan yang meliputi daya berkecambah (DB, % kec. normal), kecepatan tumbuh benih (KT, % kec. normal/etmal), berat kering kecambah (BKN, g/Kec. normal), dan daya hantar listrik (DHL, μ Mhous/g). ...
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Judul: Characteristic of Overshooting Top (OT) Based on  Himawari  8  Satellite  as  a  Convective  Cloud  Feature  that  Generates  Extreme Weather in the Java Island Region
Abstrak: Overshooting Top (OT) is a feature at the top of a convective cloud that is associated with extreme weather. Research on OT in tropical Indonesia is still very limited. The existence of geostationary satellites with wide area coverage and fast frequency observations is useful for observing the fast dynamics of the OT life cycle. Therefore, this study intends to analyze the relationship between OT and extreme weather, updraft and thermodynamic conditions of OT when extreme weather occurs, the best objective method for detecting OT in the day time and night time, and the spatiotemporal distribution of OT in the tropical region of Java Island during the 2018-2021 period. Based on visual analysis using visible channel and Himawari 8 sandwich products, 87% of extreme weather events in Java were accompanied by the appearance of OT. It indicates that the presence of the OT pattern is a convection cloud pattern or feature that is closely related to extreme weather events for the Java Island region. The existence of a time lag between the appearance of OT and extreme weather events on Java Island indicates that the OT of convection cloud can be used as a precursor or nowcasting for the appearance of extreme weather. Most of the convective cloud OT features during extreme weather events on Java Island have altitude that were only able to exceed the altitude of the equilibrium level and few were able to exceed the tropopause level of 9 km – 16 km. The difference in atmospheric conditions during extreme weather events on Java Island, which is in the tropics and subtropics, is a strong and unstable convective energy condition characterized by a larger CAPE, as well as unstable KI, LI, SI and TTI values. It is offset by kinematic factors in the form of a weak vertical wind shear (bulk wind shear 0-6 km) and a higher freezing point height. The difference between extreme weather events in the Java Island region and other tropical regions compared to subtropical regions is the strong updraft speed of convection clouds. The IRW Texture COMB algorithm based on the IRW-Texture Gradient modification and the COMB algorithm shows a significant increase in quality for detecting OT and non-OT pixels in Java. Rainy days with rainfall > 50 mm/day are very common in areas with an altitude of > 500 m. On the other hand, the level of convection activity which is indicated by the presence of OT and lightning is significantly reduced in this area. OT of convective clouds appear more frequently during the DJF season and less frequently during the JJA season. OT often appears during the day time and rarely at night time. Most OTs appear in the central part, away from the south and north coasts of Java Island during the day, while OTs that appear near the south and north coasts of Java Island can appear in the morning or afternoon.
Keyword: convective clouds, extreme weather, Overshooting Tops, Himawari 8 Satellite