Judul: Faktor yang Memengaruhi Penerapan Usahatani Padi Organik di Kecamatan Sawangan, Kabupaten Magelang
Abstrak: Degradasi lahan yang diakibatkan oleh penggunaan bahan-bahan kimia secara berlebihan tidak hanya berdampak pada lingkungan, namun berdampak juga terhadap kesehatan manusia. Penerapan usahatani padi organik di Kabupaten Magelang merupakan salah satu bentuk kepedulian terhadap lingkungan dan kesehatan, namun penerapannya masih lebih sedikit dibandingkan usahatani konvensional. Penelitian ini bertujuan untuk menganalisis keuntungan usahatani padi organik dibandingkan dengan keuntungan usahatani padi konvensional dan menganalisis faktor-faktor yang mempengaruhi penerapan usahatani padi organik di kecamatan Sawangan, Kabupaten Magelang. Penentuan responden dalam penelitian ini menggunakan teknik purposive sampling dengan jumlah 40 petani padi organik dan 40 petani padi konvensional. Regresi logistik digunakan untuk menganalisis faktor-faktor yang mempengaruhi penerapan padi organik. Faktorfaktor yang berpengaruh terhadap penerapan usahatani padi organik yaitu pendidikan formal, usia petani dan keuntungan usahatani. Selain itu, faktor-faktor yang tidak berpengaruh terhadap penerapan usahatani padi organik yaitu pengalaman berusahatani, keanggotaan di kelompok tani dan jumlah tanggungan keluarga.
Keyword: Padi organik, padi konvensional, regresi logistik

Judul: Faktor-Faktor yang Mempengaruhi Sikap Petani Padi Sawah terhadap Penerapan Pertanian Organik
Abstrak: Organic farming is one of the alternative solutions for environmental damage due to the use of synthetic materials input. Therefore, the objective of the study is to describe ricefield farmers attitude, to analyze attitudinal differences between non, semi, and organik ricefield farmers, to analyze the influencing factors on ricefield farmers attitude toward the implementation of organic farming. The study was conducted by survey methods on April 2013 in Magelang Subregency. 105 respondets was selected through sensus sampling and snowball sampling technique. The results shows that the ricefield farmers in Magelang Subregency are tends to have positive attitude towards the implementation of organic farming. Also, there is attitudinal differences among farmers. Non formal education, farming ecperience, capital ownership, acces to agricultural input material, and the values of the group has effect on the ricefield farmers attitude.
Keyword: organic farming, implementation, attitude

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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