Judul: Uji lapang hasil hibridisasi beberapa varietas kedelai
Abstrak: Tujuan dari penelitian ini adalah untuk mempelajari determinasi genetik beberapa karakter, dan untuk mempelajari sebaran populasi F2 yang akan digunakan untuk program seleksi silsilah. Penelitian ini dilakukan di Kebun Percobaan IPB Babakan, Darmaga, Bogor dan di Laboratorium Genetika Jurusan Biologi, FMIPA-IPB. Yang berlangsung dari bulan Pebruari sampai dengan bulan September 1989. Populasi dasar sebagai bahan seleksi dibentuk dengan cara melakukan persilangan antara kedelai Hitam dengan m20 dan 11 dengan m13. Dari hasil persilangan tersebut didapat biji turunan pertama (F1) yang kemudian ditanam kembali untuk mendapatkan biji turunan kedua (F2). Kemudian biji F2 tersebut ditanam kembali di lapang untuk diamati. Dari hasil pengamatarı menunjukkan bahwa karakter kualitatif untuk warna hipokotil, bunga, dan bulu dikendalikan oleh 1 pasang gen dengan 1 lokus sedangkanrı warna polong, kulit biji, dan warna hilum dikendalikan dikendalikan oleh 2 pasang gen dengan 2 lokus. Sedangkan hasil pengamatan terhadap karakter kuantitatif menunjukkan bahwa penyeleksian berdasarkan kriteria ..dst
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Judul: Seleksi pedigree terhadap produksi generasi F3 kedelai persilangan M20 X hitam
Abstrak: Telah dilakukan seleksi hasil terhadap generasi F2 dan F3 kedelai persilangan M20 X Hitam. Tetua M20 adalah kedelai mutan asal Orba yang diradiasi dengan sinar gamma Co-60 (Reinwarin, 1977), sedangkan Hitam merupakan kede- lai hitam lokal Jawa Timur. M20 mempunyai sifat-sifat ku- lit biji kuning, tipe pertumbuhan indeterminit, berumur dalam, polong tersebar pada cabang (Yusuf, Guhardja, dan Superna, 1989), dan dianggap tahan terhadap penyakit karat daun (Sudjono, 1984). Hitam mempunyai sifat-sifat kulit biji hitam, tipe pertumbuhan semi determinit, ukuran biji kecil, dan kematangan sedang (Boer, 1989). Ukuran biji M20 lebih besar daripada Hitam, namun hasil bijinya dekatan, berturut-turut ialah 15.22 dan 17.89 (Boer, 1989). ber- g/tanaman Objek pemuliaan untuk hibrid ini adalah dihasilkan varietas kedelai hitam yang berproduksi tinggi, tahan re- bah, dan resisten terhadap penyakit karat daun. Seleksi hasil pada generasi F2 telah menyisihkan 10% (29 tanaman) dari 289 tanaman anggota populasi generasi F2- Ke-29 tanaman tersebut memiliki nilai tengah bobot biji 35.43 g/tanaman, sedangkan populasi dasarnya...
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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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