Judul: Analisis Potensi Pemanfaatan Bio-slurry Sebagai Media Penanaman Lemna minor L.
Abstrak: Bio-slurry merupakan hasil fermentasi anaerobik bahan organik yang dihasilkan oleh reaktor biogas sebagai produk hasil ikutan. Bio-slurry merupakan sumber nutrisi yang baik bagi tanaman karena nutrien yang terkandung di dalamnya mudah diserap oleh akar tanaman. Hal ini menjadikan bio-slurry sangat baik untuk meningkatkan produksi tanaman budi daya seperti Lemna minor L. yang berpotensi digunakan untuk pakan ternak karena kandungan nutrisinya cukup tinggi. Tujuan penelitian ini adalah menganalisis potensi pemanfaatan bio-slurry sebagai media pertumbuhan Lemna minor L. dan mengetahui potensi produksi sebagai pakan ternak. Penelitian ini menggunakan bio-slurry sebagai media tanam Lemna minor L.. Kadar bio-slurry yang digunakan dalam penanaman sebesar 0%, 2.5%, 3%, 4% dan 5% . Analisis data yang digunakan pada penelitian ini dengan menggunakan rancangan acak lengkap dengan menggunakan 3 kali pengulangan. Hasil pengujian kadar bio-slurry terhadap bobot panen, pertumbuhan dan kandungan nutrisi Lemna minor L. berpengaruh nyata (P<0.05). Perlakuan kadar bio-slurry sebesar 2.5% dapat meningkatkan bobot panen dan kandungan nutrisi yang cukup baik secara bersamaan dibandingkan dengan perlakuan kadar bio-slurry lainnya.
Keyword: bio-slurry, Lemna minor L

Judul: Produktivitas Lemna minor L. dan Salvinia molesta Mitchell. pada Berbagai Media Tumbuh
Abstrak: Aquatic plants such as Lemna minor L. and Salvinia molesta Mitchell. were potential as feed for animal. Lemna minor L. and Salvinia molesta Mitchell. can be used as an alternative for poultry and ruminant feed. Those plants could grow well in the tropical climate. This research aims to evaluate productivity of the various of growth media and to obtain the optimal production of Lemna minor L. and Salvinia molesta Mitchell. cultivation which divided into 5 treatment with 5 replication respectively. Treatment that used in this research are control, hoagland, hyponex, compost and NPK. The parameters that analyzed in this study were total nitrogen, pH value, cover area, decrease of media volume, biomass production, dry matter, ash, organic matter, and productivity potential of Lemna minor L. and Salvinia molesta Mitchell. The research data were analyzed with a completely randomized design. The result of this study indicates that hoagland media and compost are the optimal medium for the growth of Lemna minor L. while Salvinia molesta Michell. in hoagland media
Keyword: productivity, Salvinia molesta Mitchell., media, Lemna minor L

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