Judul: Perbandingan budidaya poinsettia [Euphorbia pulcherrima Linn.] di PT MJ Flora, Indonesia dengan metrolina greenhouses, Amerika Serikat
Abstrak: Magang ini bertujuan untuk membandingkan teknik budidaya poinsettia pot yang dilakukan di MJ Flora. Indonesia dengan Metrolina Greenhouses, Amerika serikat. Tujuan lainnya yaitu untuk membandingkan pengaruh frekuensi aplikasi paclobutrazol terhadap tinggi batang dan diameter brktea pada poinsettia.
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Judul: Pengaruh Media Pengakaran dan Cahaya Terhadap Pertumbuhan Tunas Poinsettia (Euphorbia pulcherima Willd.) In Vitro
Abstrak: Penelitian ini bertujuan untuk mencari komposisi media kultur in vitro yang tepat untuk pengakaran poinsettia (Euphorbia pulcherrima Willd) in vitro dan pengaruh kombinasi fotoperiodisme dan jenis sumber cabaya artifisial terhadap pertumbuhan dan perkembangan poinsettia in vitro. Penelitian ini dilaksamkan di Laboratorium Bioteknologi Departemen Agronomi dan Hortikultura IPB Darmaga.. Bogor, dari bulan Januari sampai dengan Juli 2007. Penelitian ini terdiri dari dua percobaan. Percobaan yang pertama adalah pengaruh kombinasi media kuItur terhadap pengakaran tunas poinsettia in vitro, dan percobaan yang kedua adalah pengaruh kombinasi fotoperiodisme dan sumber cahaya artifisial terhadap pertumbuhan dan perkembangan tunas poinsettia in vitro. Percobaan pertama disusun menggunakan Rancangan Acak Lengkap (RAL) faktor tunggal kombinasi media pengakaran. Percobaan pertama terdiri atas lima perlakuan kombinasi media pengakaran yaitu MSo, MS+ rIBA 2,46 p.M+BAP 0.44 pM. MS+rnA 2,46 p.M+BAP 1,33 pM. MS+rIBA 4.92 p.M+ BAP 0.44 pM. dan MS+ rIBA 4.92 p.M+BAP 1,33 pM. Setiap perlakuan terdiri atas tujuh ulangan sehingga menghasilkan 35 satuan percobaan. Setiap satuan percobaan terdiri atas tiga tunas tanaman poinsettia in vitro, sehingga jumlah total tanaman yang diamati adalah 105 tanaman. Percobaan kedua disusun menggunakan Rancangan Petak Tersarang (Nested) dengan faktor tuggal kombinasi fotoperiodisme dan jenis sumber cahaya artifisial. Percobaan kedua terdiri dari ulangan yang tersarang pada lima perlakuan cahaya yaitu, cahaya terus menerus selama 24 jam dari lampu fluorescent sebagai kontrol, 14 jam terang dan 10 jam gelap dengan lampu incandescent, 14 jam terang dan 10 jam gelap dengan lampu fluorescent, 10 jam terang dan 14 jam gelap dengan lampu incandescent, dan 10 jam terang dan 14 jam gelap dengan lampu fluorescent. Setiap unit percobaan terdiri atas delapan ulangan sehingga menghasilkan 40 satuan percobaan. Setiap satuan percobaan terdiri atas tiga tunas tanaman poinsettia in vitro, sehingga jumlah total tanaman yang diamati adalah 120 tanaman.
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Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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