Judul: Karakteristik Fisik Tanah, Infiltrasi, dan Aliran Permukaan DAS Cisadane Hulu
Abstrak: Soil infiltration rate is influenced by soil bulk density, texture, and soil porosity. Degradation of soil physic characteristics will decrease soil infiltration rate, therefore will be increases surface runoff. The aim of the research was to identify soil physic characteristics, soil infiltration rate, and surface runoff in Upper Cisadane Watershed. Soil infiltration rate was measured using double ring infiltrometer on pine forest, shrubs and bush, mixed garden, and settlement areas. The result shows that a highest soil bulk density (lowest of soil porosity) were found on settlement areas where as the lowest soil bulk density (highest of soil porosity) were on mixed garden. Mixed garden has a highest of soil infiltration rate i.e 285 mm/h (very fast), where as the lowest soil infiltration rate was found on pine forest of 110 mm/h (medium to fast). Stream discharge of Upper Cisadane River was fluctuated with maximum and minimum discharges were 8.63 m3/s and 0.13 m3/s respectively. The value of coefficient of stream regime was 66.31 and runoff coefficient was 0.22. Based on those value, hydrology function of Upper Cisadane Watershed was classified in medium to good qualities.
Keyword: soil physics characteristics, soil infiltration, runoff, land use

Judul: Studi perilaku infiltrasi di sub DAS Ciseuseupan, DAS Ciliwung Hulu
Abstrak: Peristiwa pemasukan air ke dalam tanah merupakan sa- lah satu proses penting yang terjadi dalam suatu sistem hidrologi Daerah Aliran Sungai. Proses ini berperanan penting dalam menentukan bagian hujan atau air yang dibe- rikan yang akan terserap ke dalam tanah atau melimpah di atas permukaan tanah sebagai aliran permukaan. Penelitian ini bertujuan untuk mengetahui pola laju infiltrasi dan kumulatif infiltrasi total serta faktor- faktor yang mempengaruhinya pada berbagai penutup lahan di Sub DAS Ciseuseupan, DAS Ciliwung Hulu. Pengukuran infiltrasi di lapang berlangsung dari bulan Nopember sampai Desember 1988 dan dari bulan April sampai Juni 1989. Lokasi pengamatan ditetapkan berdasar- kan kesamaan jenis tanah, kelas lereng dan penggunaan lahan. Pengukuran infiltrasi dilakukan dengan mengguna- kan Double Ring Infiltrometer, dan pada setiap lokasi di- ulang sebanyak tiga kali. Pendekatan model infiltrasi yang digunakan adalah Model Horton. Pola laju infiltrasi berhubungan dengan kadar air awal, kelas tekstur tanah dan pola penggunaan lahan. Se- makin tinggi kadar air awal akan mempercepat tercapainya laju infiltrasi konstan. Kumulatif infiltrasi total pada lokasi yang diamati berkisar dari 57.6 persen dari total curah hujan harian (pada lokasi penggunaan lahan sawah dengan tekstur liat berdebu) hingga 60.0 persen (pada penggunaan lahan hutan dengan tekstur lempung). Sub DAS Ciseuseupan memiliki kumulatif infiltrasi to- tal bulanan sebesar 202.30 mm atau 59.1 persen dari total curah hujan harian…
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Judul: Aktivitas Antibakteri Minyak Biji Pala (Myristica fragrans H) Terenkapsulasi pada Pure Jambu Biji Merah (Psidium guajava L)
Abstrak: Preservation of fruit puree is highly dependent on the chemical preservatives and frozen storage temperature. Some species of plants have inhibitory activity of microbes and could be developed as a natural preservatives, such as nutmeg seed oil. Antibacterial activity of nutmeg seed oil encapsulated against Staphylococcus aureus, Escherichia coli, dan Lactobacillus delbrueckii with concentrations 0,06%, 0,12%, and 0,60% (w/v) were analyzed and applied into red guava puree. The inhibitory activities were indicated by decreased amount of bacteria with certain time by pour plate methode. The result showed that S. aureus was the most sensitive bacteria while L. delbrueckii was the most resistant bacteria. Concentration MBPTe 0,6% and contact time 24 hours can decrease S. aureus (2,14 log CFU/ml), E. coli (0,92 log CFU/ml), and L. delbrueckii (0,44 log CFU/ml). Application in red guava pure showed concentration 1,2% and contact time 6 hours reduced S. aureus (3,20 log CFU/ml) and E. coli (2,59 log CFU/ml) while L. delbrueckii after contact 24 hours (1,17 log CFU/ml).
Keyword: red guava puree, preservative, nutmeg seed oil, encapsulation