Judul: Pengaruh Keragaman Iklim terhadap Serangan Empat Organisme Pengganggu Tumbuhan Utama Tanaman Padi Di Jawa Barat
Abstrak: Pada tanaman padi, terdapat 4 hama yang sering menurunkan produksinya yaitu hama penggerek batang padi (PBP), wereng batang coklat (WBC), hawar daun bakteri (HDB), dan blast (Pyricularia oryzae Cav.). Tingkat serangan keempat OPT tersebut sensitif terhadap perubahan suhu udara, kelembaban dan curah hujan. Penelitian ini bertujuan untuk mengetahui hubungan antara keragaman ketiga variabel iklim terhadap luas serangan 4 hama utama padi di Provinsi Jawa Barat. Penelitian ini menggunakan data sekunder luas areal serangan hama padi dari Badan Perlindungan Pangan dan Hortikultura (BPTPH) dan data iklim (suhu, kelembaban, dan curah hujan) dari Badan Meteorologi, Klimatologi dan Geofisika (BMKG) periode 1990 - 2018. Pengaruh keragaman iklim terhadap luas serangan 4 OPT utama diuji dengan menggunakan analisis regresi linier. Hasil penelitian menunjukkan bahwa suhu udara memberikan kontribusi yang nyata terhadap peningkatan luas serangan keempat hama utama padi, sedangkan kelembapan relatif hanya memberikan kontribusi yang nyata terhadap peningkatan luas serangan blas dan curah hujan tidak memberikan kontribusi yang nyata terhadap perubahan luas serangan 4 hama tersebut., In rice crops, there are 4 pests that often reduce their production, namely rice stem borer (RSB), brown planthopper (BPH), bacterial leaf blight (BLB), and blast (Pyricularia oryzae Cav.). The invasion level of the four pests is sensitive to changes in air temperature, humidity and rainfall. This study was aimed to examine the relationship between the diversity of the three climate variables on the invasion area of the 4 main pests of rice in West Java Province. This research used secondary data on the area of rice pests invasion from the Food and Horticultural Protection Agency (BPTPH) and climate data (temperature, humidity and rainfall) from the Meteorology, Climatology and Geophysics Agency (BMKG) in the period 1990 - 2018. The impact of climate variability on invasion area of 4 major rice pests was examined using a linear regression analysis. The results showed that air temperature contributed significantly to the increase in invasion area of the four main rice pests, while relative humidity only contribute significantly to the increase in invasion area of blast, and rainfall did not significantly contribute to changes in the invasion area of the four pests.
Keyword: climate change, regression linear analysis, rice pests

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: Membran Komposit Kitosan-Zeolit untuk Aplikasi Direct Methanol Fuel Cell
Abstrak: Direct methanol fuel cell (DMFC) is a fuel cell that utilize methanol as the fuel source. The electrolyte membrane used in the DMFC system in this research was chitosan-zeolite composite membrane. The composite membrane was synthesized with chitosan-zeolite composition variation of 1:1, 1:2, 1:3, and 2:1. The membranes were analyzed by Fourier transform infrared spectrophotometer (FTIR) and scanning electron microscope, and for the specific gravity. Membrane performances were tested with methanol uptake, methanol permeability, conductivity, and potential difference in the DMFC system. The FTIR spectrum showed no formation of new functional groups inducating that the composite membrane was a result of physical mixing. Morphological analysis showed that the membrane was nonporous. Chitosan-zeolite 1:3 composite membrane had the highest specific gravity and methanol uptake, 1.4226 g/mL and 41.44%, respectively. The highest proton conductivity was showed by the 1:2 chitosanzeolite composite membrane, namely 7.2946× 10-7 S/cm. Based on this research results, chitosan-zeolite composite membrane can be applied in DMFC system.
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