Judul: Infiltration Rate of Soil with Different Land Uses at IPB University, Bogor Regency, West Java
Abstrak: Informasi laju dan kapasitas infiltrasi suatu tanah dengan berbagai jenis penggunaanya penting untuk diketahui sebagai informasi dasar bagi pengelolaan sumberdaya air. Penelitian ini bertujuan untuk mendapatkan informasi laju dan kapasitas infiltrasi tanah pada kebun sawit, kebun karet dan semak di Kampus IPB Dramaga dan menganalisis model pendugaan infiltrasi terbaik. Laju dan kapasitas infiltrasi diketahui melalui pengukuran penggunaan ring infiltrasi ganda dan menggunakan model infiltrasi Horton dan Kostiakov. Pemilihan model terbaik antara Model Horton dengan Kostiakov menggunakan kriteria uji-t, root mean square error (RMSE) dan mean absolute error (MAE). Hasil pengukuran infiltrasi menunjukkan lahan semak memiliki kapasitas infiltrasi tertinggi (21.62 cm/jam), sedangkan kapasitas infiltrasi di tanah kebun karet dan kebut sawit masing-masing sebesar 5.15 cm/jam dan 3.25 cm/jam. Model Horton dan Model Kostiakov baik digunakan dalam pendugaan laju infiltrasi. Model Kostiakov memberikan hasil dugaan laju infiltrasi tanah dengan penggunaan lahan sebagai kebun sawit, kebun karet dan semak di Kampus IPB Dramaga yang lebih baik daripada Model Horton., Information on soil infiltration rate capacity with different land uses is essential to knowing basic water resource management information. This study aims to obtain information on soil infiltration rate and capacity with land uses such as oil palm and rubber plantations and shrubs in IPB University, Dramaga Campus, and to analyze the best infiltration estimation, model. Infiltration rate and capacity were measured by using double rings infiltrometer and the Horton and Kostiakov infiltration models. The performance of the infiltration models was based on the result of the t-test, residual mean square error (RMSE), and mean absolute error (MAE). The infiltration measurements show the soil infiltration rate in shrub land use was higher than in rubber plantation and oil palm plantation land uses, with the infiltration capacity of 21.62 cm/hr, 5.15 cm/hr, and 3.25 cm/hr, respectively. Horton dan Kostiakov models are both good for estimating infiltration rate; however, the Kostiakov model estimate infiltration rate better than Horton Model.
Keyword: Infiltration, Oil palm plantations, Rubber plantations, Shrubs

Judul: Keragaan Infiltrasi Tanah Latosol pada Beberapa Penggunaan Lahan di DAS Ciujung
Abstrak: Land use is an important aspect in maintaining ecosystem sustainability, particularly in the watershed ecosystem. Land use determines to physical, chemical, and biological characteristics of soil. These soil characteristics influence to the growth of plants and the performances of water infiltration into soil. Infiltration is an essential part of the hydrological cycle that has an important role water availability in the soil. Infiltration process have an important role to the distribution of rainfall and control to runoff, flood, erosion and ground water storage and finally will determines the availability of river discharge in dry season. The aims of this research is to assess the performance of soil infiltration in various land use in Ciujung watershed. The study was conducted on three land use types that included plantative forest (HT), dense mixed garden (KCR), and less-dense mixed garden (KCTR). The field observation was done by using the Double Ring infiltrometer method, while the the analysis of the physical and chemical and other soil characteristics were done in the Laboratory of Soil and Water Conservation, Department of Soil Science and Land Resources, Faculty of Agriculture. The results of this research showed that the infiltration rate is strongly influenced by land use. Infiltration rate is the highest and most stable on HT land use, followed by KCR and KCTR. Constant infiltration rate at HT and KCR is belonging to quickly class, while at KCTR is relatively moderate to fast. The magnitude of the rate constant infiltration in HT (23.4 cm h-1) is higher than KCR (13.2 cm h-1) and KCTR (6.0 cm h-1). The high rate infiltration of the soil on the land use of HT support it able to accommodate as much water (6.45 dm3) that higher than at KCR (3,66 dm3) and at KCTR (1.52 dm3). Infiltration rate is influenced by pores with large size (PDSC), while the volume of water infiltration is more influenced by the total porosity of the soil. Besides it is influenced by land use, soil infiltration in the study area is also determined by the physical and chemical characteristic of the soil organic matter, bulk density, total porosity, aggregate stability, macro pores, very fast drainage pore (PDSC), and soil texture.
Keyword: Bogor Agricultural University (IPB), infiltration volume., physical and chemical characterstics of soil, land use, Infiltration rate

Judul: Trichomonas Gallinae Penyebab Trichomonosis Pada Unggas
Abstrak: Trichomonas gallinae adalah protozoa yang bergerak aktof dengan keempat flagella yang mempunyai layar dan pada salah satu sisinya terdapat membran seperti sirip ikan yang berombak. Spesies dari genus Trichomonas ini mempunyai arti penting pada unggas, karena dapat menyebabkan infeksi pada alat pencernaan bagian atas.
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