Judul: Studi Efektivitas Beberapa Perlakuan Herbisida dengan Dua Alat Semprot untuk Pengendalian Gulma Utama di Jalur Tanaman Karet Menghasilkan
Abstrak: Percobaan ini bertujuan untuk mengelahui efektivitas herbisida sulfosate, glifosaate dan glifosate + adjuvant yang diaplikasikan dengan alat semprot CDA Micron Herbi dan SP Solo, dalam penekanannya terhadap bobot kering spesies gulma dan penutupan gulma total di jalur tanaman karet yang telah menghasilkan.
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Judul: Efektivitas herbisida sulfosat dengan beberapa dosis dan dua aplikator terhadap pengendalian gulma di pertanaman karet menghasilkan
Abstrak: Tujuan percobaan ini adalah untuk mengetahui keefek- tivan pemakaian herbisida sulfosat pada beberapa taraf dosis dengan aplikator semprot punggung (knapsack) jenis Solo dan CDA-Micron Herbi untuk mengendalikan gulma pada jalur tanaman karet menghasilkan (TM). Percobaan dilaku- kan di kebun karet Cikabayan, Bogor, mulai bulan November 1994 sampai bulan Februari 1995. Herbisida yang digunakan adalah herbisida dengan formulasi Banish 145 AS dengan bahan aktif N-phosphonome - thylglycine trimethylsulfonium (sulfosat) 145 gr/1 formu- lasi. Percobaan dilakukan dengan menggunakan rancangan acak kelompok dua faktor dan 4 ulangan terdiri atas faktor dosis herbisida sulfosat 0.000 0.290, 0.435, 0.580, 0.725 dan 0.870 kg b.a./ha dan faktor aplikator, yaitu alat semprot punggung jenis Solo dengan volume semprot 400 1/ha dan CDA-Micron Herbi dengan volume semprot 100 1/ha. Aplikasi dilakukan pada petak contoh berukuran 2 m X 10 m. Peubah respon yang diamati adalah bobot kering gulma total, bobot kering gulma dominan, persentase penutupan gulma total dan keracunan terhadap tanaman karet. ...
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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