Judul: Uji Efektivitas Beberapa Takaran Pupuk Majemuk Dan Tunggal N-P-K Terhadap Pertumbuhan Dan Produksi Kubis (Brassicca Oleracea Cv. Capitata) Pada Andisol, Lembang (Bandung)2
Abstrak: Program intensifikasi memegfulg peranan penting dalam upaya peningkatan produksi kubis. Pemenuhan kebutuhan hara tanaman yang memadai melalui pemberian pupuk berimbang dengan mempertimbangkan jenis, takaran, waktu, dan cara pemupukan yang tepat merupakan tindakan yang rasional. Pengunaan pupuk majemuk N-P-K menjadi salah satu alternatif uotuk memenuhi kebutuhan tersebut, karena ketiga unsur hara ini paling banyak dibutuhkan tanaman. Penelitian ini bertujuan mengevaluasi pengaruh takaran pupuk N, P, dan K dari pupuk majemuk (Phonska) dibandingkan dengan pupuk tunggal (Urea, SP-36, Kel, dan ZA) sesuai dengan takaran standar petani dan rekomendasi Dinas Pertanian terhadap pertumbuhan, kadar hara, dan produksi kubis (Brassica oleracea cv. Capitata)
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Judul: Aplikasi Pupuk Phonska Cair terhadap Produksi Kubis
pada Andisol Pasir Sarongge Kabupaten Cianjur Jawa Barat.
Abstrak: Pemupukan yang efektif diperlukan dalam menunjang produksi pertanian. Pertanian skala luas membutuhkan teknik aplikasi pupuk yang cepat dan efisien dalam penggunaan tenaga kerja. Pemupukan lewat penyemprotan ke daun sebagian besar dilakukan pada komoditas hortikultura. Kubis merupakan salah satu komoditas hortikultura yang sangat penting dan ditanam secara luas. Budidaya tanaman kubis cukup menjanjikan. Tujuan penelitian ini yaitu mengevaluasi pupuk Phonska cair pada budidaya tanaman kubis. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) dengan tujuh perlakuan dan tiga ulangan. Komoditas yang dipakai yaitu tanaman kubis yang ditanam pada lahan percobaan Pasir Sarongge, IPB University. Hasil uji aplikasi pupuk tidak berpengaruh nyata pada parameter pertumbuhan dan produksi tanaman kubis. Analisis tanah sebelum perlakuan untuk tiga blok menunjukkan bahwa pH agak masam, C-organik tinggi sampai sangat tinggi, N-total sedang sampai tinggi, P-tersedia sangat tinggi, basa-basa dapat dipertukarkan (Ca, Mg, dan K) berkisar dari sedang sampai sangat tinggi, sedangkan Na umumnya rendah. Kejenuhan basa (KB) berkisar dari rendah sampai tinggi dan kejenuhan Al adalah sangat rendah, sedangkan analisis tanah setelah perlakuan menunjukkan adanya perubahan baik kenaikan atau penurunan sifat kimia tanah. Hasil analisis tanah setelah perlakuan menunjukkan bahwa pH umumnya agak masam sampai masam, C-organik tanah tinggi sampai sangat tinggi, dan P-tersedia sangat tinggi. Basa-basa dapat dipertukarkan (Ca, Mg, dan K) berkisar dari sedang sampai sangat tinggi sementara Na umumnya rendah. Kejenuhan basa berkisar dari sedang sampai sangat tinggi dan kejenuhan Al adalah sangat rendah. Nilai Relative Agronomic Effectiveness semua perlakuan pemberian pupuk relatif lebih besar dari perlakuan pupuk standar. Nilai R/C rasio dan B/C rasio dari seluruh perlakuan menunjukkan bahwa usaha tani kubis sudah layak atau sudah menguntungkan dari aspek finansial. Berdasarkan hasil penelitian, perlakuan 500 kg/ha Petroganik, 400 kg/ha Phonska 15:10:12, 300 kg/ha ZA, 5 l/ha Phonska Cair 10:8:3 memberikan pengaruh paling baik dari sisi produksi karena memiliki bobot biomasa tertinggi, bobot krop tertinggi, diameter krop terpanjang, dan nilai RAE paling besar., Effective fertilization is needed to support agricultural production. Large scale farming requires fertilizer application techniques that are fast and efficient in the use of labor. Fertilization by spraying leaves is mostly done on horticultural commodities. Cabbage is a very important horticultural commodity and is widely cultivated. Cabbage cultivation is quite promising. The aim of this research was to evaluate liquid Phonska fertilizer in cabbage plants. This research used a Randomized Group Design (RGD) with seven treatments and three replications. The commodity used was cabbage plants planted on the Pasir Sarongge experimental land, IPB University. The results of the fertilizer application test did not have a significant effect on the growth and production parameters of cabbage plants. Soil analysis before treatment of tree blocks showed that the pH were slightly acidic, organic C were high to very high, total N were medium to high, available P were very high, exchangeable bases (Ca, Mg, and K) ranged from medium to very high while Na were generally low. Base saturation ranged from low to high and Al saturation were very low. Meanwhile soil analysis after treatment showed changes in either increasing or decreasing soil chemical properties. The results of soil analysis after treatment showed that the
Keyword: B/C ratio, R/C ratio, soil analysis, Relative Agronomic
Effectiveness

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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