Judul: Pemanfaatan Blotong dan PEmupukan Urea terhadap Pertumbuhan Bibit Cengkeh (Eugenia caryophyllus (Sprengel) Bullock et Harrison)
Abstrak: Hasil percobaan menunjukkan bahwa perlakuan blotong dan pupuk Urea tidak berpengaruh nyata terhadap peubah yang diamati seperti pertambahan tinggi tanaman, pertambahan daun, luas daun, bobot kering akar, bobot kering batang, bobot kering daun, rasio bobot kering/bobot segar batang dan rasio bobot kering/bobot segar daun.
Keyword: 

Judul: Pengaruh naungan dan pemberian zat pengatur tumbuh mixtalol terhadap pertumbuhan bibit tanaman cengkeh (Eugenia caryophyllus Sprengel)
Abstrak: Tujuan penelitian adalah untuk mengetahui pengaruh penggunaan naungan, zat pengatur tumbuh mixtalol serta interaksi antara naungan dan zat pengatur tumbuh miztalol tersebut terhadap pertumbuhan bibit tanaman cengkeh (E. caryophyllus, Sp.). Penelitian dilaksanakan di Kebun Percobaan Cimanggu Balai Penelitian Tanaman Rempah dan Obat Bogor. Rancangan yang dipakai untuk menyusun percobaan adalah Rancangan Petak Terbagi, terdiri dari 2 faktor dan 3 ulangan/ kelompok. Petak Utama terdiri dari 4 tingkat naungan, berturut-turut naungan 0, 25, 50, dan 75 persen masing-masing pada No, N1, N2, dan N3. Anak Petak terdiri dari 4 konsentrasi zat pengatur tumbuh mixtalol, berturut 0, 1, 2, dan 3 ppm, masing-masing pada Mo, M1, M2, dan M. Pengamatan pertumbuhan bibit dilakukan setiap 2 minggu, kecuali terhadap bobot kering, luas daun, dan kematian tanaman setiap 4 minggu. Kandungan khlorofil daun diamati 3 kali setelah bibit diberi perlakuan 8 minggu, seterusnya setiap 6 minggu. Analisis unsur hara tanaman diambil pada pengamatan terakhir saja. Analisis pertumbuhan tanaman, berdasarkan bobot kering dan luas daun adalah suatu cara untuk mengikuti dinamika fotosintesis dan pertimbangan aspek fisiologis tanaman, diukur dan dihitung setiap 4 minggu. Unsur iklim diamati pada saat tertentu dan atau 1 kali seminggu. Hasil percobaan menunjukkan bahwa naungan yang diberi sebagai perlakuan pada bibit tanaman cengkeh (E. caryophyllus, Sp.) sangat mempengaruhi dan menentukan pertumbuhan dan perkembangan bibit tersebut. Makin tinggi intensitas cahaya yang diberikan, maka makin berkurang pertumbuhan bibit. Dibawah cahaya penuh bibit tumbuh kerdil, daun-daun kecil dan berwarna kekuningan, dan mudah terserang hama penyakit akibatnya kemungkinan kematian bibit lebih besar. Naungan disamping menghindari efek penyinaran cahaya mataha- ri langsung, juga mengurangi pengaruh suhu tanah yang tinggi dan laju transpirasi bibit yang besar, serta kekurangan hara. ..
Keyword: Eugenia caryophyllus, Mixtalol

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.
Keyword: