Judul: Uji Lapangan Pengendalian Hama Terpadu Biointensif terhadap Wereng Batang Cokelat dan Hawar Daun Bakteri pada Padi.
Abstrak: Padi merupakan komoditas pertanian yang sangat penting. OPT seperti wereng batang cokelat (WBC) dan hawar daun bakteri (HDB) merupakan salah satu kendala produksi padi. Pengelolaan hama terpadu dengan mengutamakan pemanfaatan sumber daya hayati merupakan pendekatan yang diharapkan dapat berkelanjutan dan ramah lingkungan. Penelitian ini bertujuan untuk membandingkan teknologi PHT bio-intensif dengan metode konvensional dalam pengelolaan WBC dan HDB pada padi serta pengaruhnya terhadap hasil gabah kering panen panen (GKP) di Kecamatan Sampang, Kabupaten Cilacap. Variabel pengamatan berupa kepadatan populasi WBC dan intensitas penyakit HDB diamati setiap minggu, sedangkan bobot gabah kering panen diamati pada akhir percobaan. Hasil penelitian menunjukkan bahwa teknologi PHT bio-intensif relatif mampu menekan perkembangan WBC dan HDB pada padi dibandingkan dengan metode konvensional. Hasil bobot GKP PHT bio-intensif cenderung lebih tinggi dari metode konvensional, namun tidak berbeda signifikan secara statistik. Diantara perlakuan yang diuji, perlakuan BIO 2 menunjukkan keuntungan tertinggi dibandingkan perlakuan lainnya., Rice is a very important agricultural commodity. Plant pests such as the brown planthopper (BPH) and bacterial leaf blight (BLB) are one of rice productions constraints. Integrated pest management by prioritizing the use of biological resources is an approach which is expected to be sustainable and friendly to the environment. This study aims to compare bio-intensive IPM technology with conventional methods in managing BPH and BLB in rice and its effect on harvested dry grain yields in Sampang District, Cilacap Regency. The variables were weekly observation of BPH population density and BLB disease intensity, and harvested dry grain weight at the end of experiment. The result showed that bio-intensive IPM technology was relatively able to suppress the development of rice BPH and BLB comparing to conventional method. The production of harvested dry grain in the bio-intensive IPM treatment tended to be higher than the conventional treatment although not statistically different. Among treatments tested, BIO 2 treatment showed highest profit over other treatments.
Keyword: biological resources, environmental friendly, production yield, sustainable agriculture

Judul: SURVEY OF DISTRIBUTION OF BROWN PLANTHOPPER POPULATION IN RICE CROPS IN SUBANG REGENCY WEST JAVA
Abstrak: Padi (Oryza sativa L.) merupakan komoditas penting sebagai sumber pangan pokok di Indonesia. Budidaya tanaman padi seringkali mengalami kegagalan akibat serangan hama wereng batang cokelat (WBC) Nilaparvata lugens Stål. Penelitian ini bertujuan mengetahui persebaran populasi WBC di Kabupaten Subang, kerapatan populasinya, dan tingkat kerusakan tanaman padi di tiga lokasi ketinggian tempat yang berbeda. Penelitian ini dilakukan dengan menelusuri keberadaan serangan WBC di lahan persawahan di areal kabupaten Subang dan memetakan persebarannya, menentukan lahan perlakuan terinfestasi di tiga lokasi ketinggian tempat berbeda, mengamati tingkat kerusakan tanaman pada umur 4 MST dan kerapatan populasi WBC. Data penunjang diperoleh melalui wawancara terhadap petani tentang teknik budidaya padi setempat kaitannya dengan pengendalian WBC di lahannya. Luas serangan dan intensitas kerusakan tanaman tertinggi 91,5% dan 41%, dengan jumlah populasi WBC tertinggi 1.8 ekor/rumpun ditemukan di lahan padi dataran rendah pada ketinggian 27-38 m dpl, sebaliknya kerusakan paling rendah sebesar 22% dan 4.3% dengan jumlah populasi 0.35 ekor/rumpun ditemukan di dataran tinggi pada 516-526 m dpl. Penggunaan varietas padi Ciherang dan Inpari 31 tidak berpengaruh terhadap jumlah populasi WBC. Lokasi penanaman padi di dataran rendah dengan curah hujan dan suhu lingkungan yang tinggi berkontribusi dalam peningkatan populasi WBC, Rice (Oryza sativa L.) is an important commodity as the staple food in Indonesia. Rice cultivation often fails due to attacks by the brown planthopper (BPH) Nilaparvata lugens Stål. This study aims to determine the distribution of BPH population in Subang Regency, the population density, and the level of damage to rice crops at three different altitude locations. This research was conducted by tracing the presence of BPH infestation in paddy fields in the Subang district area and mapping their distribution, determining the infested treatment areas at three different altitude locations, observing the level of plant damage at 4 WAP and the population density of BPH. Supporting data was obtained through interviews with farmers regarding local rice cultivation techniques in relation to BPH control in their fields. The highest attack area and intensity of crop damage were 91.5% and 41%, with the highest number of BPH populations of 1.8 individuals/hills found in lowland rice fields at an altitude of 27-38 masl, whereas the lowest damage was 22% and 4.3% with the lowest populations of 0.35 individuals/hills found in the highlands at 516-526 masl. Ciherang and Inpari 31 rice varieties had no effect on the number of WBC populations. The location of rice cultivation in the lowlands with high rainfall and ambient temperature contributed to the increase in the BPH population.
Keyword: Intensitas, Ketinggian tempat, Luas serangan, Varietas padi, Altitude, Attack area, Intensity, Rice varieties

Judul: Konstruksi Hukum Grup Kurva Eliptik Atas F3m
Abstrak: Elliptic curves upon F3m can be divided in two cases, i.e. supersingular and nonsupersingular case. Based on group laws on elliptic curves, a new arithmetic upon F3m can be formulated as an addition process of two random points on the curve. This addition process can then be applied to the ElGamal algorithm.
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