Judul: Studi pengaruh konsentrasi starter untuk dekomposisi limbah daun kayu putih sebagai media tumbuh terhadap pertumbuhan semai Paraserianthes Falcataria (L) Nilson dan Swietenia macrophylla King
Abstrak: Tujuan penelitian ini adalah untuk mengetahui konsentrasi starter yang optimum untuk mendekomposisikan limbah kayu putih sebagai alternatif bahan substitusi bagian atas lapisan olah (top soil) untuk media semai Paraserianthes falcataria (L) Nielson dan Swietenia macrophylla King. Rancangan yang dipakai dalam penelitian ini adalah rancangan faktorial dalam rancangan acak lengkap dengan dua faktor. Faktor jenis tanaman sebagai faktor A dengan dua taraf dan faktor konsentrasi starter sebagai faktor B dengan 6 taraf. Analisa hasil menggunakan uji F, uji Duncan dan uji Pengaruh Faktor Tunggal.
Keyword: kayu putih

Judul: Pengaruh Media Tanam dan Pupuk NPK terhadap Pertumbuhan Semai Kayu Putih (Melaleuca leucadendra (L.)L
Abstrak: Kayu putih (M. leucadendra) merupakan tanaman yang berperan penting, menghasilkan minyak kayu putih. Peningkatkan kualitas bibitnya dapat dilakukan dengan pemupukan dan penggunaan media tanam yang tepat. Penelitian ini bertujuan menganalisis pertumbuhan semai kayu putih sebagai respon terhadap pemberian pupuk NPK dan berbagai media tanam, serta interaksi keduanya. Penelitian ini menggunakan rancangan acak lengkap (RAL) dengan dua faktor yaitu pupuk NPK dan media tanam. Hasil penelitian menunjukkan bahwa pemberian pupuk NPK berpengaruh nyata terhadap tinggi dan kekokohan semai, sedangkan media tanam berpengaruh nyata terhadap seluruh parameter yang diamati. Interaksi antara pemberian pupuk NPK dengan media tanam berpengaruh nyata terhadap tinggi semai, jumlah daun, dan berat kering total, namun tidak berpengaruh nyata terhadap diameter, kekokohan semai, dan berat basah total. Perlakuan yang memiliki hasil paling baik terdapat pada P0M2 (tanpa pupuk NPK dengan media tanam kompos+tanah) dan P1M2 (pemberian pupuk NPK dengan media tanam kompos+tanah), karena menghasilkan nilai rerata paling tinggi terhadap semua parameter yang diamati.
Keyword: kayu putih, NPK fertilizer, planting medium

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